mirror of
https://github.com/roc-lang/roc.git
synced 2025-09-27 05:49:08 +00:00
1089 lines
40 KiB
Rust
1089 lines
40 KiB
Rust
//! Derivers for the `Inspect` ability.
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use std::iter::once;
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use roc_can::expr::{
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AnnotatedMark, ClosureData, Expr, Field, Recursive, WhenBranch, WhenBranchPattern,
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};
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use roc_can::pattern::Pattern;
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use roc_collections::SendMap;
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use roc_derive_key::inspect::FlatInspectableKey;
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use roc_module::called_via::CalledVia;
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use roc_module::ident::Lowercase;
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use roc_module::symbol::Symbol;
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use roc_region::all::{Loc, Region};
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use roc_types::subs::{
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Content, ExhaustiveMark, FlatType, GetSubsSlice, LambdaSet, OptVariable, RecordFields,
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RedundantMark, SubsSlice, TagExt, TupleElems, UnionLambdas, UnionTags, Variable,
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VariableSubsSlice,
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};
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use roc_types::types::RecordField;
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use crate::util::Env;
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use crate::{synth_var, DerivedBody};
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pub(crate) fn derive_to_inspector(
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env: &mut Env<'_>,
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key: FlatInspectableKey,
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def_symbol: Symbol,
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) -> DerivedBody {
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let (body, body_type) = match key {
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FlatInspectableKey::List() => to_inspector_list(env, def_symbol),
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FlatInspectableKey::Set() => unreachable!(),
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FlatInspectableKey::Dict() => unreachable!(),
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FlatInspectableKey::Record(fields) => {
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// Generalized record var so we can reuse this impl between many records:
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// if fields = { a, b }, this is { a: t1, b: t2 } for fresh t1, t2.
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let flex_fields = fields
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.into_iter()
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.map(|name| {
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(
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name,
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RecordField::Required(env.subs.fresh_unnamed_flex_var()),
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)
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})
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.collect::<Vec<(Lowercase, _)>>();
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let fields = RecordFields::insert_into_subs(env.subs, flex_fields);
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let record_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Record(fields, Variable::EMPTY_RECORD)),
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);
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to_inspector_record(env, record_var, fields, def_symbol)
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}
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FlatInspectableKey::Tuple(arity) => {
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// Generalized tuple var so we can reuse this impl between many tuples:
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// if arity = n, this is (t1, ..., tn) for fresh t1, ..., tn.
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let flex_elems = (0..arity)
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.map(|idx| (idx as usize, env.subs.fresh_unnamed_flex_var()))
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.collect::<Vec<_>>();
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let elems = TupleElems::insert_into_subs(env.subs, flex_elems);
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let tuple_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Tuple(elems, Variable::EMPTY_TUPLE)),
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);
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to_inspector_tuple(env, tuple_var, elems, def_symbol)
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}
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FlatInspectableKey::TagUnion(tags) => {
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// Generalized tag union var so we can reuse this impl between many unions:
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// if tags = [ A arity=2, B arity=1 ], this is [ A t1 t2, B t3 ] for fresh t1, t2, t3
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let flex_tag_labels = tags
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.into_iter()
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.map(|(label, arity)| {
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let variables_slice =
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VariableSubsSlice::reserve_into_subs(env.subs, arity.into());
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for var_index in variables_slice {
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env.subs[var_index] = env.subs.fresh_unnamed_flex_var();
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}
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(label, variables_slice)
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})
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.collect::<Vec<_>>();
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let union_tags = UnionTags::insert_slices_into_subs(env.subs, flex_tag_labels);
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let tag_union_var = synth_var(
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env.subs,
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Content::Structure(FlatType::TagUnion(
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union_tags,
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TagExt::Any(Variable::EMPTY_TAG_UNION),
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)),
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);
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to_inspector_tag_union(env, tag_union_var, union_tags, def_symbol)
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}
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FlatInspectableKey::Function(_arity) => {
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// Desired output: \x, y, z -> ... ===> "<function>"
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todo!();
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}
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FlatInspectableKey::Opaque => todo!(),
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FlatInspectableKey::Error => todo!(),
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};
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let specialization_lambda_sets =
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env.get_specialization_lambda_sets(body_type, Symbol::INSPECT_TO_INSPECTOR);
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DerivedBody {
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body,
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body_type,
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specialization_lambda_sets,
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}
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}
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fn to_inspector_list(env: &mut Env<'_>, fn_name: Symbol) -> (Expr, Variable) {
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// Build \lst -> list, List.walk, (\elem -> Inspect.toInspector elem)
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use Expr::*;
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let lst_sym = env.new_symbol("lst");
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let elem_sym = env.new_symbol("elem");
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// List elem
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let elem_var = env.subs.fresh_unnamed_flex_var();
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let elem_var_slice = SubsSlice::insert_into_subs(env.subs, [elem_var]);
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let list_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Apply(Symbol::LIST_LIST, elem_var_slice)),
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);
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// build `toInspector elem` type
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// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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let to_inspector_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_TO_INSPECTOR);
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// elem -[clos]-> t1
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let to_inspector_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
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let elem_inspector_var = env.subs.fresh_unnamed_flex_var(); // t1
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let elem_to_inspector_fn_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Func(
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elem_var_slice,
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to_inspector_clos_var,
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elem_inspector_var,
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)),
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);
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// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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// ~ elem -[clos]-> t1
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env.unify(to_inspector_fn_var, elem_to_inspector_fn_var);
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// toInspector : (typeof rcd.a) -[clos]-> Inspector fmt where fmt implements InspectorFormatter
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let to_inspector_var =
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AbilityMember(Symbol::INSPECT_TO_INSPECTOR, None, elem_to_inspector_fn_var);
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let to_inspector_fn = Box::new((
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to_inspector_fn_var,
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Loc::at_zero(to_inspector_var),
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to_inspector_clos_var,
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elem_inspector_var,
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));
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// toInspector elem
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let to_inspector_call = Call(
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to_inspector_fn,
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vec![(elem_var, Loc::at_zero(Var(elem_sym, elem_var)))],
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CalledVia::Space,
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);
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// elem -[to_elem_inspector]-> toInspector elem
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let to_elem_inspector_sym = env.new_symbol("to_elem_inspector");
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// Create fn_var for ambient capture; we fix it up below.
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let to_elem_inspector_fn_var = synth_var(env.subs, Content::Error);
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// -[to_elem_inspector]->
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let to_elem_inspector_labels =
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UnionLambdas::insert_into_subs(env.subs, once((to_elem_inspector_sym, vec![])));
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let to_elem_inspector_lset = synth_var(
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env.subs,
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Content::LambdaSet(LambdaSet {
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solved: to_elem_inspector_labels,
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recursion_var: OptVariable::NONE,
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unspecialized: SubsSlice::default(),
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ambient_function: to_elem_inspector_fn_var,
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}),
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);
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// elem -[to_elem_inspector]-> toInspector elem
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env.subs.set_content(
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to_elem_inspector_fn_var,
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Content::Structure(FlatType::Func(
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elem_var_slice,
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to_elem_inspector_lset,
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elem_inspector_var,
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)),
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);
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// \elem -> toInspector elem
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let to_elem_inspector = Closure(ClosureData {
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function_type: to_elem_inspector_fn_var,
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closure_type: to_elem_inspector_lset,
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return_type: elem_inspector_var,
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name: to_elem_inspector_sym,
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captured_symbols: vec![],
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recursive: Recursive::NotRecursive,
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arguments: vec![(
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elem_var,
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AnnotatedMark::known_exhaustive(),
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Loc::at_zero(Pattern::Identifier(elem_sym)),
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)],
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loc_body: Box::new(Loc::at_zero(to_inspector_call)),
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});
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// build `Inspect.list lst (\elem -> Inspect.toInspector elem)` type
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// List e, (e -> Inspector fmt) -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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let inspect_list_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_LIST);
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// List elem, List.walk, to_elem_inspector_fn_var -[clos]-> t1
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let list_walk_fn_var = env.import_builtin_symbol_var(Symbol::LIST_WALK);
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let this_inspect_list_args_slice = VariableSubsSlice::insert_into_subs(
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env.subs,
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[list_var, list_walk_fn_var, to_elem_inspector_fn_var],
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);
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let this_inspect_list_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
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let this_list_inspector_var = env.subs.fresh_unnamed_flex_var(); // t1
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let this_inspect_list_fn_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Func(
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this_inspect_list_args_slice,
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this_inspect_list_clos_var,
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this_list_inspector_var,
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)),
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);
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// List e, (e -> Inspector fmt) -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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// ~ List elem, to_elem_inspector_fn_var -[clos]-> t1
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env.unify(inspect_list_fn_var, this_inspect_list_fn_var);
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// Inspect.list : List elem, to_elem_inspector_fn_var -[clos]-> Inspector fmt where fmt implements InspectorFormatter
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let inspect_list = AbilityMember(Symbol::INSPECT_LIST, None, this_inspect_list_fn_var);
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let inspect_list_fn = Box::new((
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this_inspect_list_fn_var,
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Loc::at_zero(inspect_list),
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this_inspect_list_clos_var,
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this_list_inspector_var,
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));
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// Inspect.list lst to_elem_inspector
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let inspect_list_call = Call(
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inspect_list_fn,
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vec![
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(list_var, Loc::at_zero(Var(lst_sym, list_var))),
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(
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list_walk_fn_var,
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Loc::at_zero(Var(Symbol::LIST_WALK, list_walk_fn_var)),
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),
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(to_elem_inspector_fn_var, Loc::at_zero(to_elem_inspector)),
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],
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CalledVia::Space,
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);
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// Inspect.custom \fmt -> Inspect.apply (Inspect.list ..) fmt
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let (body, this_inspector_var) = wrap_in_inspect_custom(
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env,
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inspect_list_call,
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this_list_inspector_var,
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lst_sym,
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list_var,
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);
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// \lst -> Inspect.list lst (\elem -> Inspect.toInspector elem)
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// Create fn_var for ambient capture; we fix it up below.
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let fn_var = synth_var(env.subs, Content::Error);
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// -[fn_name]->
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let fn_name_labels = UnionLambdas::insert_into_subs(env.subs, once((fn_name, vec![])));
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let fn_clos_var = synth_var(
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env.subs,
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Content::LambdaSet(LambdaSet {
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solved: fn_name_labels,
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recursion_var: OptVariable::NONE,
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unspecialized: SubsSlice::default(),
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ambient_function: fn_var,
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}),
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);
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// List elem -[fn_name]-> Inspector fmt
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let list_var_slice = SubsSlice::insert_into_subs(env.subs, once(list_var));
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env.subs.set_content(
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fn_var,
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Content::Structure(FlatType::Func(
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list_var_slice,
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fn_clos_var,
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this_inspector_var,
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)),
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);
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// \lst -[fn_name]-> Inspect.list lst (\elem -> Inspect.toInspector elem)
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let clos = Closure(ClosureData {
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function_type: fn_var,
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closure_type: fn_clos_var,
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return_type: this_inspector_var,
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name: fn_name,
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captured_symbols: vec![],
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recursive: Recursive::NotRecursive,
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arguments: vec![(
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list_var,
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AnnotatedMark::known_exhaustive(),
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Loc::at_zero(Pattern::Identifier(lst_sym)),
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)],
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loc_body: Box::new(Loc::at_zero(body)),
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});
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(clos, fn_var)
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}
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fn to_inspector_record(
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env: &mut Env<'_>,
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record_var: Variable,
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fields: RecordFields,
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fn_name: Symbol,
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) -> (Expr, Variable) {
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// Suppose rcd = { a: t1, b: t2 }. Build
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//
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// \rcd -> Inspect.record [
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// { key: "a", value: Inspect.toInspector rcd.a },
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// { key: "b", value: Inspect.toInspector rcd.b },
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// ]
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let rcd_sym = env.new_symbol("rcd");
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let whole_rcd_var = env.subs.fresh_unnamed_flex_var(); // type of the { key, value } records in the list
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use Expr::*;
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let fields_list = fields
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.iter_all()
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.map(|(field_name_index, field_var_index, _)| {
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let field_name = env.subs[field_name_index].clone();
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let field_var = env.subs[field_var_index];
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let field_var_slice = VariableSubsSlice::new(field_var_index.index, 1);
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// key: "a"
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let key_field = Field {
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var: Variable::STR,
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region: Region::zero(),
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loc_expr: Box::new(Loc::at_zero(Str(field_name.as_str().into()))),
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};
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// rcd.a
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let field_access = RecordAccess {
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record_var,
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ext_var: env.subs.fresh_unnamed_flex_var(),
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field_var,
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loc_expr: Box::new(Loc::at_zero(Var(
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rcd_sym,
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env.subs.fresh_unnamed_flex_var(),
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))),
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field: field_name,
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};
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// build `toInspector rcd.a` type
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// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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let to_inspector_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_TO_INSPECTOR);
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// (typeof rcd.a) -[clos]-> t1
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let to_inspector_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
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let inspector_var = env.subs.fresh_unnamed_flex_var(); // t1
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let this_to_inspector_fn_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Func(
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field_var_slice,
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to_inspector_clos_var,
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inspector_var,
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)),
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);
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// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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// ~ (typeof rcd.a) -[clos]-> t1
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env.unify(to_inspector_fn_var, this_to_inspector_fn_var);
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// toInspector : (typeof rcd.a) -[clos]-> Inspector fmt where fmt implements InspectorFormatter
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let to_inspector_var =
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AbilityMember(Symbol::INSPECT_TO_INSPECTOR, None, to_inspector_fn_var);
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let to_inspector_fn = Box::new((
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to_inspector_fn_var,
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Loc::at_zero(to_inspector_var),
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to_inspector_clos_var,
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inspector_var,
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));
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// toInspector rcd.a
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let to_inspector_call = Call(
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to_inspector_fn,
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vec![(field_var, Loc::at_zero(field_access))],
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CalledVia::Space,
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);
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// value: toInspector rcd.a
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let value_field = Field {
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var: inspector_var,
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region: Region::zero(),
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loc_expr: Box::new(Loc::at_zero(to_inspector_call)),
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};
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// { key: "a", value: toInspector rcd.a }
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let mut kv = SendMap::default();
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kv.insert("key".into(), key_field);
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kv.insert("value".into(), value_field);
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let this_record_fields = RecordFields::insert_into_subs(
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env.subs,
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(once(("key".into(), RecordField::Required(Variable::STR))))
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.chain(once(("value".into(), RecordField::Required(inspector_var)))),
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);
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let this_record_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Record(this_record_fields, Variable::EMPTY_RECORD)),
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);
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// NOTE: must be done to unify the lambda sets under `inspector_var`
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env.unify(this_record_var, whole_rcd_var);
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Loc::at_zero(Record {
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record_var: whole_rcd_var,
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fields: kv,
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})
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})
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.collect::<Vec<_>>();
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// typeof [ { key: .., value: .. }, { key: .., value: .. } ]
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let fields_rcd_var_slice = VariableSubsSlice::insert_into_subs(env.subs, once(whole_rcd_var));
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let fields_list_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Apply(Symbol::LIST_LIST, fields_rcd_var_slice)),
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);
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// [ { key: .., value: ..}, .. ]
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let fields_list = List {
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elem_var: whole_rcd_var,
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loc_elems: fields_list,
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};
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// build `Inspect.record [ { key: .., value: ..}, .. ]` type
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// List { key : Str, value : Inspector fmt } -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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let inspect_record_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_RECORD);
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// fields_list_var -[clos]-> t1
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let fields_list_var_slice =
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VariableSubsSlice::insert_into_subs(env.subs, once(fields_list_var));
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let inspect_record_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
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let inspector_var = env.subs.fresh_unnamed_flex_var(); // t1
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let this_inspect_record_fn_var = synth_var(
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env.subs,
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Content::Structure(FlatType::Func(
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fields_list_var_slice,
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inspect_record_clos_var,
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inspector_var,
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)),
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);
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// List { key : Str, value : Inspector fmt } -[uls]-> Inspector fmt where fmt implements InspectorFormatter
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// ~ fields_list_var -[clos]-> t1
|
|
env.unify(inspect_record_fn_var, this_inspect_record_fn_var);
|
|
|
|
// Inspect.record : fields_list_var -[clos]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let inspect_record_var = AbilityMember(Symbol::INSPECT_RECORD, None, inspect_record_fn_var);
|
|
let inspect_record_fn = Box::new((
|
|
inspect_record_fn_var,
|
|
Loc::at_zero(inspect_record_var),
|
|
inspect_record_clos_var,
|
|
inspector_var,
|
|
));
|
|
|
|
// Inspect.record [ { key: .., value: .. }, .. ]
|
|
let inspect_record_call = Call(
|
|
inspect_record_fn,
|
|
vec![(fields_list_var, Loc::at_zero(fields_list))],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
// Inspect.custom \fmt -> Inspect.apply (Inspect.record ..) fmt
|
|
let (body, this_inspector_var) =
|
|
wrap_in_inspect_custom(env, inspect_record_call, inspector_var, rcd_sym, record_var);
|
|
|
|
// Create fn_var for ambient capture; we fix it up below.
|
|
let fn_var = synth_var(env.subs, Content::Error);
|
|
|
|
// -[fn_name]->
|
|
let fn_name_labels = UnionLambdas::insert_into_subs(env.subs, once((fn_name, vec![])));
|
|
let fn_clos_var = synth_var(
|
|
env.subs,
|
|
Content::LambdaSet(LambdaSet {
|
|
solved: fn_name_labels,
|
|
recursion_var: OptVariable::NONE,
|
|
unspecialized: SubsSlice::default(),
|
|
ambient_function: fn_var,
|
|
}),
|
|
);
|
|
// typeof rcd -[fn_name]-> (typeof Inspect.record [ .. ] = Inspector fmt)
|
|
let record_var_slice = SubsSlice::insert_into_subs(env.subs, once(record_var));
|
|
env.subs.set_content(
|
|
fn_var,
|
|
Content::Structure(FlatType::Func(
|
|
record_var_slice,
|
|
fn_clos_var,
|
|
this_inspector_var,
|
|
)),
|
|
);
|
|
|
|
// \rcd -[fn_name]-> Inspect.record [ { key: .., value: .. }, .. ]
|
|
let clos = Closure(ClosureData {
|
|
function_type: fn_var,
|
|
closure_type: fn_clos_var,
|
|
return_type: this_inspector_var,
|
|
name: fn_name,
|
|
captured_symbols: vec![],
|
|
recursive: Recursive::NotRecursive,
|
|
arguments: vec![(
|
|
record_var,
|
|
AnnotatedMark::known_exhaustive(),
|
|
Loc::at_zero(Pattern::Identifier(rcd_sym)),
|
|
)],
|
|
loc_body: Box::new(Loc::at_zero(body)),
|
|
});
|
|
|
|
(clos, fn_var)
|
|
}
|
|
|
|
fn to_inspector_tuple(
|
|
env: &mut Env<'_>,
|
|
tuple_var: Variable,
|
|
elems: TupleElems,
|
|
fn_name: Symbol,
|
|
) -> (Expr, Variable) {
|
|
// Suppose tup = (t1, t2). Build
|
|
//
|
|
// \tup -> Inspect.tuple [
|
|
// Inspect.toInspector tup.0,
|
|
// Inspect.toInspector tup.1,
|
|
// ]
|
|
|
|
let tup_sym = env.new_symbol("tup");
|
|
let whole_inspector_in_list_var = env.subs.fresh_unnamed_flex_var(); // type of the inspector in the list
|
|
|
|
use Expr::*;
|
|
|
|
let elem_inspectors_list = elems
|
|
.iter_all()
|
|
.map(|(elem_index, elem_var_index)| {
|
|
let index = env.subs[elem_index];
|
|
let elem_var = env.subs[elem_var_index];
|
|
let elem_var_slice = VariableSubsSlice::new(elem_var_index.index, 1);
|
|
|
|
// tup.0
|
|
let tuple_access = TupleAccess {
|
|
tuple_var,
|
|
ext_var: env.subs.fresh_unnamed_flex_var(),
|
|
elem_var,
|
|
loc_expr: Box::new(Loc::at_zero(Var(
|
|
tup_sym,
|
|
env.subs.fresh_unnamed_flex_var(),
|
|
))),
|
|
index,
|
|
};
|
|
|
|
// build `toInspector tup.0` type
|
|
// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let to_inspector_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_TO_INSPECTOR);
|
|
|
|
// (typeof tup.0) -[clos]-> t1
|
|
let to_inspector_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
|
|
let inspector_var = env.subs.fresh_unnamed_flex_var(); // t1
|
|
let this_to_inspector_fn_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Func(
|
|
elem_var_slice,
|
|
to_inspector_clos_var,
|
|
inspector_var,
|
|
)),
|
|
);
|
|
|
|
// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
// ~ (typeof tup.0) -[clos]-> t1
|
|
env.unify(to_inspector_fn_var, this_to_inspector_fn_var);
|
|
|
|
// toInspector : (typeof tup.0) -[clos]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let to_inspector_var =
|
|
AbilityMember(Symbol::INSPECT_TO_INSPECTOR, None, to_inspector_fn_var);
|
|
let to_inspector_fn = Box::new((
|
|
to_inspector_fn_var,
|
|
Loc::at_zero(to_inspector_var),
|
|
to_inspector_clos_var,
|
|
inspector_var,
|
|
));
|
|
|
|
// toInspector tup.0
|
|
let to_inspector_call = Call(
|
|
to_inspector_fn,
|
|
vec![(elem_var, Loc::at_zero(tuple_access))],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
// NOTE: must be done to unify the lambda sets under `inspector_var`
|
|
env.unify(inspector_var, whole_inspector_in_list_var);
|
|
|
|
Loc::at_zero(to_inspector_call)
|
|
})
|
|
.collect::<Vec<_>>();
|
|
|
|
// typeof [ toInspector tup.0, toInspector tup.1 ]
|
|
let whole_inspector_in_list_var_slice =
|
|
VariableSubsSlice::insert_into_subs(env.subs, once(whole_inspector_in_list_var));
|
|
let elem_inspectors_list_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Apply(
|
|
Symbol::LIST_LIST,
|
|
whole_inspector_in_list_var_slice,
|
|
)),
|
|
);
|
|
|
|
// [ toInspector tup.0, toInspector tup.1 ]
|
|
let elem_inspectors_list = List {
|
|
elem_var: whole_inspector_in_list_var,
|
|
loc_elems: elem_inspectors_list,
|
|
};
|
|
|
|
// build `Inspect.tuple [ toInspector tup.0, toInspector tup.1 ]` type
|
|
// List (Inspector fmt) -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let inspect_tuple_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_TUPLE);
|
|
|
|
// elem_inspectors_list_var -[clos]-> t1
|
|
let elem_inspectors_list_var_slice =
|
|
VariableSubsSlice::insert_into_subs(env.subs, once(elem_inspectors_list_var));
|
|
let inspect_tuple_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
|
|
let inspector_var = env.subs.fresh_unnamed_flex_var(); // t1
|
|
let this_inspect_tuple_fn_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Func(
|
|
elem_inspectors_list_var_slice,
|
|
inspect_tuple_clos_var,
|
|
inspector_var,
|
|
)),
|
|
);
|
|
|
|
// List (Inspector fmt) -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
// ~ elem_inspectors_list_var -[clos]-> t1
|
|
env.unify(inspect_tuple_fn_var, this_inspect_tuple_fn_var);
|
|
|
|
// Inspect.tuple : elem_inspectors_list_var -[clos]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let inspect_tuple_var = AbilityMember(Symbol::INSPECT_TUPLE, None, inspect_tuple_fn_var);
|
|
let inspect_tuple_fn = Box::new((
|
|
inspect_tuple_fn_var,
|
|
Loc::at_zero(inspect_tuple_var),
|
|
inspect_tuple_clos_var,
|
|
inspector_var,
|
|
));
|
|
|
|
// Inspect.tuple [ { key: .., value: .. }, .. ]
|
|
let inspect_tuple_call = Call(
|
|
inspect_tuple_fn,
|
|
vec![(elem_inspectors_list_var, Loc::at_zero(elem_inspectors_list))],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
// Inspect.custom \fmt -> Inspect.apply (Inspect.tuple_var ..) fmt
|
|
let (body, this_inspector_var) =
|
|
wrap_in_inspect_custom(env, inspect_tuple_call, inspector_var, tup_sym, tuple_var);
|
|
|
|
// Create fn_var for ambient capture; we fix it up below.
|
|
let fn_var = synth_var(env.subs, Content::Error);
|
|
|
|
// -[fn_name]->
|
|
let fn_name_labels = UnionLambdas::insert_into_subs(env.subs, once((fn_name, vec![])));
|
|
let fn_clos_var = synth_var(
|
|
env.subs,
|
|
Content::LambdaSet(LambdaSet {
|
|
solved: fn_name_labels,
|
|
recursion_var: OptVariable::NONE,
|
|
unspecialized: SubsSlice::default(),
|
|
ambient_function: fn_var,
|
|
}),
|
|
);
|
|
// typeof tup -[fn_name]-> (typeof Inspect.tuple [ .. ] = Inspector fmt)
|
|
let tuple_var_slice = SubsSlice::insert_into_subs(env.subs, once(tuple_var));
|
|
env.subs.set_content(
|
|
fn_var,
|
|
Content::Structure(FlatType::Func(
|
|
tuple_var_slice,
|
|
fn_clos_var,
|
|
this_inspector_var,
|
|
)),
|
|
);
|
|
|
|
// \tup -[fn_name]-> Inspect.tuple [ { key: .., value: .. }, .. ]
|
|
let clos = Closure(ClosureData {
|
|
function_type: fn_var,
|
|
closure_type: fn_clos_var,
|
|
return_type: this_inspector_var,
|
|
name: fn_name,
|
|
captured_symbols: vec![],
|
|
recursive: Recursive::NotRecursive,
|
|
arguments: vec![(
|
|
tuple_var,
|
|
AnnotatedMark::known_exhaustive(),
|
|
Loc::at_zero(Pattern::Identifier(tup_sym)),
|
|
)],
|
|
loc_body: Box::new(Loc::at_zero(body)),
|
|
});
|
|
|
|
(clos, fn_var)
|
|
}
|
|
|
|
fn to_inspector_tag_union(
|
|
env: &mut Env<'_>,
|
|
tag_union_var: Variable,
|
|
tags: UnionTags,
|
|
fn_name: Symbol,
|
|
) -> (Expr, Variable) {
|
|
// Suppose tag = [ A t1 t2, B t3 ]. Build
|
|
//
|
|
// \tag -> when tag is
|
|
// A v1 v2 -> Inspect.tag "A" [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
// B v3 -> Inspect.tag "B" [ Inspect.toInspector v3 ]
|
|
|
|
let tag_sym = env.new_symbol("tag");
|
|
let whole_tag_inspectors_var = env.subs.fresh_unnamed_flex_var(); // type of the Inspect.tag ... calls in the branch bodies
|
|
|
|
use Expr::*;
|
|
|
|
let branches = tags
|
|
.iter_all()
|
|
.map(|(tag_name_index, tag_vars_slice_index)| {
|
|
// A
|
|
let tag_name = &env.subs[tag_name_index].clone();
|
|
let vars_slice = env.subs[tag_vars_slice_index];
|
|
// t1 t2
|
|
let payload_vars = env.subs.get_subs_slice(vars_slice).to_vec();
|
|
// v1 v2
|
|
let payload_syms: Vec<_> = std::iter::repeat_with(|| env.unique_symbol())
|
|
.take(payload_vars.len())
|
|
.collect();
|
|
|
|
// `A v1 v2` pattern
|
|
let pattern = Pattern::AppliedTag {
|
|
whole_var: tag_union_var,
|
|
tag_name: tag_name.clone(),
|
|
ext_var: Variable::EMPTY_TAG_UNION,
|
|
// (t1, v1) (t2, v2)
|
|
arguments: (payload_vars.iter())
|
|
.zip(payload_syms.iter())
|
|
.map(|(var, sym)| (*var, Loc::at_zero(Pattern::Identifier(*sym))))
|
|
.collect(),
|
|
};
|
|
let branch_pattern = WhenBranchPattern {
|
|
pattern: Loc::at_zero(pattern),
|
|
degenerate: false,
|
|
};
|
|
|
|
// whole type of the elements in [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
let whole_payload_inspectors_var = env.subs.fresh_unnamed_flex_var();
|
|
// [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
let payload_to_inspectors = (payload_syms.iter())
|
|
.zip(payload_vars.iter())
|
|
.map(|(&sym, &sym_var)| {
|
|
// build `toInspector v1` type
|
|
// expected: val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let to_inspector_fn_var =
|
|
env.import_builtin_symbol_var(Symbol::INSPECT_TO_INSPECTOR);
|
|
|
|
// wanted: t1 -[clos]-> t'
|
|
let var_slice_of_sym_var =
|
|
VariableSubsSlice::insert_into_subs(env.subs, [sym_var]); // [ t1 ]
|
|
let to_inspector_clos_var = env.subs.fresh_unnamed_flex_var(); // clos
|
|
let inspector_var = env.subs.fresh_unnamed_flex_var(); // t'
|
|
let this_to_inspector_fn_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Func(
|
|
var_slice_of_sym_var,
|
|
to_inspector_clos_var,
|
|
inspector_var,
|
|
)),
|
|
);
|
|
|
|
// val -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
// ~ t1 -[clos]-> t'
|
|
env.unify(to_inspector_fn_var, this_to_inspector_fn_var);
|
|
|
|
// toInspector : t1 -[clos]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let to_inspector_var =
|
|
AbilityMember(Symbol::INSPECT_TO_INSPECTOR, None, this_to_inspector_fn_var);
|
|
let to_inspector_fn = Box::new((
|
|
this_to_inspector_fn_var,
|
|
Loc::at_zero(to_inspector_var),
|
|
to_inspector_clos_var,
|
|
inspector_var,
|
|
));
|
|
|
|
// toInspector rcd.a
|
|
let to_inspector_call = Call(
|
|
to_inspector_fn,
|
|
vec![(sym_var, Loc::at_zero(Var(sym, sym_var)))],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
// NOTE: must be done to unify the lambda sets under `inspector_var`
|
|
env.unify(inspector_var, whole_payload_inspectors_var);
|
|
|
|
Loc::at_zero(to_inspector_call)
|
|
})
|
|
.collect();
|
|
|
|
// typeof [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
let whole_inspectors_var_slice =
|
|
VariableSubsSlice::insert_into_subs(env.subs, [whole_payload_inspectors_var]);
|
|
let payload_inspectors_list_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Apply(
|
|
Symbol::LIST_LIST,
|
|
whole_inspectors_var_slice,
|
|
)),
|
|
);
|
|
|
|
// [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
let payload_inspectors_list = List {
|
|
elem_var: whole_payload_inspectors_var,
|
|
loc_elems: payload_to_inspectors,
|
|
};
|
|
|
|
// build `Inspect.tag "A" [ ... ]` type
|
|
// expected: Str, List (Inspector fmt) -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let inspect_tag_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_TAG);
|
|
|
|
// wanted: Str, List whole_inspectors_var -[clos]-> t'
|
|
let this_inspect_tag_args_var_slice = VariableSubsSlice::insert_into_subs(
|
|
env.subs,
|
|
[Variable::STR, payload_inspectors_list_var],
|
|
);
|
|
let this_inspect_tag_clos_var = env.subs.fresh_unnamed_flex_var(); // -[clos]->
|
|
let this_inspector_var = env.subs.fresh_unnamed_flex_var(); // t'
|
|
let this_inspect_tag_fn_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Func(
|
|
this_inspect_tag_args_var_slice,
|
|
this_inspect_tag_clos_var,
|
|
this_inspector_var,
|
|
)),
|
|
);
|
|
|
|
// Str, List (Inspector fmt) -[uls]-> Inspector fmt where fmt implements InspectorFormatter
|
|
// ~ Str, List whole_inspectors_var -[clos]-> t'
|
|
env.unify(inspect_tag_fn_var, this_inspect_tag_fn_var);
|
|
|
|
// Inspect.tag : Str, List whole_inspectors_var -[clos]-> Inspector fmt where fmt implements InspectorFormatter
|
|
let inspect_tag_var = AbilityMember(Symbol::INSPECT_TAG, None, this_inspect_tag_fn_var);
|
|
let inspect_tag_fn = Box::new((
|
|
this_inspect_tag_fn_var,
|
|
Loc::at_zero(inspect_tag_var),
|
|
this_inspect_tag_clos_var,
|
|
this_inspector_var,
|
|
));
|
|
|
|
// Inspect.tag "A" [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
let inspect_tag_call = Call(
|
|
inspect_tag_fn,
|
|
vec![
|
|
// (Str, "A")
|
|
(Variable::STR, Loc::at_zero(Str(tag_name.0.as_str().into()))),
|
|
// (List (Inspector fmt), [ Inspect.toInspector v1, Inspect.toInspector v2 ])
|
|
(
|
|
payload_inspectors_list_var,
|
|
Loc::at_zero(payload_inspectors_list),
|
|
),
|
|
],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
// NOTE: must be done to unify the lambda sets under `inspector_var`
|
|
// Inspect.tag "A" [ Inspect.toInspector v1, Inspect.toInspector v2 ] ~ whole_inspectors
|
|
env.unify(this_inspector_var, whole_tag_inspectors_var);
|
|
|
|
WhenBranch {
|
|
patterns: vec![branch_pattern],
|
|
value: Loc::at_zero(inspect_tag_call),
|
|
guard: None,
|
|
redundant: RedundantMark::known_non_redundant(),
|
|
}
|
|
})
|
|
.collect::<Vec<_>>();
|
|
|
|
// when tag is
|
|
// A v1 v2 -> Inspect.tag "A" [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
// B v3 -> Inspect.tag "B" [ Inspect.toInspector v3 ]
|
|
let when_branches = When {
|
|
loc_cond: Box::new(Loc::at_zero(Var(tag_sym, tag_union_var))),
|
|
cond_var: tag_union_var,
|
|
expr_var: whole_tag_inspectors_var,
|
|
region: Region::zero(),
|
|
branches,
|
|
branches_cond_var: tag_union_var,
|
|
exhaustive: ExhaustiveMark::known_exhaustive(),
|
|
};
|
|
|
|
// Inspect.custom \fmt -> Inspect.apply (when ..) fmt
|
|
let (body, this_inspector_var) = wrap_in_inspect_custom(
|
|
env,
|
|
when_branches,
|
|
whole_tag_inspectors_var,
|
|
tag_sym,
|
|
tag_union_var,
|
|
);
|
|
|
|
// Create fn_var for ambient capture; we fix it up below.
|
|
let fn_var = synth_var(env.subs, Content::Error);
|
|
|
|
// -[fn_name]->
|
|
let fn_name_labels = UnionLambdas::insert_into_subs(env.subs, once((fn_name, vec![])));
|
|
let fn_clos_var = synth_var(
|
|
env.subs,
|
|
Content::LambdaSet(LambdaSet {
|
|
solved: fn_name_labels,
|
|
recursion_var: OptVariable::NONE,
|
|
unspecialized: SubsSlice::default(),
|
|
ambient_function: fn_var,
|
|
}),
|
|
);
|
|
// tag_union_var -[fn_name]-> whole_tag_inspectors_var
|
|
let tag_union_var_slice = SubsSlice::insert_into_subs(env.subs, once(tag_union_var));
|
|
env.subs.set_content(
|
|
fn_var,
|
|
Content::Structure(FlatType::Func(
|
|
tag_union_var_slice,
|
|
fn_clos_var,
|
|
this_inspector_var,
|
|
)),
|
|
);
|
|
|
|
// \tag ->
|
|
// Inspect.custom \fmt -> Inspect.apply (
|
|
// when tag is
|
|
// A v1 v2 -> Inspect.tag "A" [ Inspect.toInspector v1, Inspect.toInspector v2 ]
|
|
// B v3 -> Inspect.tag "B" [ Inspect.toInspector v3 ])
|
|
// fmt
|
|
let clos = Closure(ClosureData {
|
|
function_type: fn_var,
|
|
closure_type: fn_clos_var,
|
|
return_type: this_inspector_var,
|
|
name: fn_name,
|
|
captured_symbols: vec![],
|
|
recursive: Recursive::NotRecursive,
|
|
arguments: vec![(
|
|
tag_union_var,
|
|
AnnotatedMark::known_exhaustive(),
|
|
Loc::at_zero(Pattern::Identifier(tag_sym)),
|
|
)],
|
|
loc_body: Box::new(Loc::at_zero(body)),
|
|
});
|
|
|
|
(clos, fn_var)
|
|
}
|
|
|
|
/// Lift `inspector` to `Inspect.custom \fmt -> Inspect.apply inspector fmt`
|
|
fn wrap_in_inspect_custom(
|
|
env: &mut Env,
|
|
inspector: Expr,
|
|
inspector_var: Variable,
|
|
captured_symbol: Symbol,
|
|
captured_var: Variable,
|
|
) -> (Expr, Variable) {
|
|
use Expr::*;
|
|
|
|
let fn_name = env.new_symbol("custom");
|
|
|
|
// fmt: fmt where fmt implements InspectorFormatter
|
|
let fmt_sym = env.new_symbol("fmt");
|
|
let fmt_var = env.subs.fresh_unnamed_flex_var();
|
|
|
|
// build `Inspect.apply inspector fmt` type
|
|
// expected: Inspect.apply : Inspector fmt, fmt -[apply]-> fmt where fmt implements InspectorFormatter
|
|
let apply_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_APPLY);
|
|
|
|
// wanted: Inspect.apply : inspector_var, fmt -[clos]-> fmt where fmt implements InspectorFormatter
|
|
let this_apply_args_var_slice =
|
|
VariableSubsSlice::insert_into_subs(env.subs, [inspector_var, fmt_var]);
|
|
let this_apply_clos_var = env.subs.fresh_unnamed_flex_var(); // -[clos]->
|
|
let this_apply_fn_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Func(
|
|
this_apply_args_var_slice,
|
|
this_apply_clos_var,
|
|
fmt_var,
|
|
)),
|
|
);
|
|
|
|
// Inspector fmt, fmt -[apply]-> ft where fmt implements InspectorFormatter
|
|
// ~ inspector_var, fmt -[clos]-> fmt where fmt implements InspectorFormatter
|
|
env.unify(apply_fn_var, this_apply_fn_var);
|
|
|
|
// Inspect.apply : inspector_var, fmt -[apply]-> fmt where fmt implements InspectorFormatter
|
|
let apply_fn = Box::new((
|
|
this_apply_fn_var,
|
|
Loc::at_zero(Var(Symbol::INSPECT_APPLY, this_apply_fn_var)),
|
|
this_apply_clos_var,
|
|
fmt_var,
|
|
));
|
|
|
|
// Inspect.apply inspector fmt
|
|
let apply_call = Call(
|
|
apply_fn,
|
|
vec![
|
|
// (inspector_var, inspector)
|
|
(inspector_var, Loc::at_zero(inspector)),
|
|
// (fmt, fmt_var)
|
|
(fmt_var, Loc::at_zero(Var(fmt_sym, fmt_var))),
|
|
],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
// Create fn_var for ambient capture; we fix it up below.
|
|
let fn_var = synth_var(env.subs, Content::Error);
|
|
|
|
// -[[FN_name captured_var]]->
|
|
let fn_name_labels =
|
|
UnionLambdas::insert_into_subs(env.subs, once((fn_name, vec![captured_var])));
|
|
let fn_clos_var = synth_var(
|
|
env.subs,
|
|
Content::LambdaSet(LambdaSet {
|
|
solved: fn_name_labels,
|
|
recursion_var: OptVariable::NONE,
|
|
unspecialized: SubsSlice::default(),
|
|
ambient_function: fn_var,
|
|
}),
|
|
);
|
|
|
|
// fmt -[[FN_name captured_var]]-> Inspect.apply inspector fmt
|
|
let args_slice = SubsSlice::insert_into_subs(env.subs, vec![fmt_var]);
|
|
env.subs.set_content(
|
|
fn_var,
|
|
Content::Structure(FlatType::Func(args_slice, fn_clos_var, fmt_var)),
|
|
);
|
|
|
|
// \fmt -[[fn_name captured_var]]-> Inspect.apply inspector fmt
|
|
let clos = Closure(ClosureData {
|
|
function_type: fn_var,
|
|
closure_type: fn_clos_var,
|
|
return_type: fmt_var,
|
|
name: fn_name,
|
|
captured_symbols: vec![(captured_symbol, captured_var)],
|
|
recursive: Recursive::NotRecursive,
|
|
arguments: vec![(
|
|
fmt_var,
|
|
AnnotatedMark::known_exhaustive(),
|
|
Loc::at_zero(Pattern::Identifier(fmt_sym)),
|
|
)],
|
|
loc_body: Box::new(Loc::at_zero(apply_call)),
|
|
});
|
|
|
|
// Build
|
|
// Inspect.custom \fmt -> Inspect.apply inspector fmt
|
|
//
|
|
// expected: Inspect.custom : (fmt -> fmt) -> Inspector fmt where fmt implements InspectorFormatter
|
|
let custom_fn_var = env.import_builtin_symbol_var(Symbol::INSPECT_CUSTOM);
|
|
|
|
// wanted: Inspect.custom : fn_var -[clos]-> t'
|
|
let this_custom_args_var_slice = VariableSubsSlice::insert_into_subs(env.subs, [fn_var]);
|
|
let this_custom_clos_var = env.subs.fresh_unnamed_flex_var(); // -[clos]->
|
|
let this_custom_inspector_var = env.subs.fresh_unnamed_flex_var(); // t'
|
|
let this_custom_fn_var = synth_var(
|
|
env.subs,
|
|
Content::Structure(FlatType::Func(
|
|
this_custom_args_var_slice,
|
|
this_custom_clos_var,
|
|
this_custom_inspector_var,
|
|
)),
|
|
);
|
|
|
|
// (fmt -> fmt) -[..]-> Inspector fmt where fmt implements InspectorFormatter
|
|
// ~ fn_var -[clos]-> t'
|
|
env.unify(custom_fn_var, this_custom_fn_var);
|
|
|
|
// Inspect.custom : (fmt -> fmt) -> Inspector fmt where fmt implements InspectorFormatter
|
|
let custom_fn = Box::new((
|
|
this_custom_fn_var,
|
|
Loc::at_zero(Var(Symbol::INSPECT_CUSTOM, this_custom_fn_var)),
|
|
this_custom_clos_var, // -[clos]->
|
|
this_custom_inspector_var, // t' ~ Inspector fmt
|
|
));
|
|
|
|
// Inspect.custom \fmt -> Inspect.apply inspector fmt
|
|
let custom_call = Call(
|
|
custom_fn,
|
|
vec![(fn_var, Loc::at_zero(clos))],
|
|
CalledVia::Space,
|
|
);
|
|
|
|
(custom_call, this_custom_inspector_var)
|
|
}
|