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add first version of List.dropAt

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* adds an implementation with no uniqueness/mutability
This commit is contained in:
Dan Knutson 2021-10-02 20:03:07 -05:00
parent ff9866420b
commit 3baff93a97
11 changed files with 145 additions and 13 deletions
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24
compiler/can/src/builtins.rs
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@ -87,6 +87,7 @@ pub fn builtin_defs_map(symbol: Symbol, var_store: &mut VarStore) -> Option<Def>
LIST_MAP2 => list_map2,
LIST_MAP3 => list_map3,
LIST_DROP => list_drop,
LIST_DROP_AT => list_drop_at,
LIST_SWAP => list_swap,
LIST_MAP_WITH_INDEX => list_map_with_index,
LIST_KEEP_IF => list_keep_if,
@ -1979,6 +1980,29 @@ fn list_drop(symbol: Symbol, var_store: &mut VarStore) -> Def {
)
}
/// List.dropAt : List elem, Nat -> List elem
fn list_drop_at(symbol: Symbol, var_store: &mut VarStore) -> Def {
let list_var = var_store.fresh();
let index_var = var_store.fresh();
let body = RunLowLevel {
op: LowLevel::ListDropAt,
args: vec![
(list_var, Var(Symbol::ARG_1)),
(index_var, Var(Symbol::ARG_2)),
],
ret_var: list_var,
};
defn(
symbol,
vec![(list_var, Symbol::ARG_1), (index_var, Symbol::ARG_2)],
var_store,
body,
list_var,
)
}
/// List.append : List elem, elem -> List elem
fn list_append(symbol: Symbol, var_store: &mut VarStore) -> Def {
let list_var = var_store.fresh();