Qualified lookups return params

crates/compiler/can/src/annotation.rs

@@ -3,7 +3,7 @@ use crate::procedure::{QualifiedReference, References};
 use crate::scope::{PendingAbilitiesInScope, Scope};
 use roc_collections::{ImMap, MutSet, SendMap, VecMap, VecSet};
 use roc_module::ident::{Ident, Lowercase, TagName};
-use roc_module::symbol::Symbol;
+use roc_module::symbol::{LookedupSymbol, Symbol};
 use roc_parse::ast::{AssignedField, ExtractSpaces, Pattern, Tag, TypeAnnotation, TypeHeader};
 use roc_problem::can::ShadowKind;
 use roc_region::all::{Loc, Region};
@@ -398,7 +398,7 @@ pub(crate) fn make_apply_symbol(
         }
     } else {
         match env.qualified_lookup(scope, module_name, ident, region) {
-            Ok(symbol) => {
+            Ok(LookedupSymbol { symbol, params: _ }) => {
                 references.insert_type_lookup(symbol, QualifiedReference::Qualified);
                 Ok(symbol)
             }

crates/compiler/can/src/def.rs

@@ -32,6 +32,7 @@ use roc_module::ident::Lowercase;
 use roc_module::ident::ModuleName;
 use roc_module::ident::QualifiedModuleName;
 use roc_module::symbol::IdentId;
+use roc_module::symbol::LookedupSymbol;
 use roc_module::symbol::ModuleId;
 use roc_module::symbol::Symbol;
 use roc_parse::ast;
@@ -512,19 +513,21 @@ fn canonicalize_claimed_ability_impl<'a>(
             let label_str = label.value;
             let region = label.region;
 
-            let member_symbol =
-                match env.qualified_lookup_with_module_id(scope, ability_home, label_str, region) {
-                    Ok(symbol) => symbol,
-                    Err(_) => {
-                        env.problem(Problem::NotAnAbilityMember {
-                            ability,
-                            name: label_str.to_owned(),
-                            region,
-                        });
+            let LookedupSymbol {
+                symbol: member_symbol,
+                params: _,
+            } = match env.qualified_lookup_with_module_id(scope, ability_home, label_str, region) {
+                Ok(symbol) => symbol,
+                Err(_) => {
+                    env.problem(Problem::NotAnAbilityMember {
+                        ability,
+                        name: label_str.to_owned(),
+                        region,
+                    });
 
-                        return Err(());
-                    }
-                };
+                    return Err(());
+                }
+            };
 
             // There are two options for how the implementation symbol is defined.
             //
@@ -604,7 +607,10 @@ fn canonicalize_claimed_ability_impl<'a>(
             };
             let impl_region = value.region;
 
-            let member_symbol = match env.qualified_lookup_with_module_id(
+            let LookedupSymbol {
+                symbol: member_symbol,
+                params: _,
+            } = match env.qualified_lookup_with_module_id(
                 scope,
                 ability_home,
                 label.value,

crates/compiler/can/src/env.rs

@@ -5,7 +5,10 @@ use crate::scope::Scope;
 use bumpalo::Bump;
 use roc_collections::{MutMap, VecSet};
 use roc_module::ident::{Ident, ModuleName};
-use roc_module::symbol::{IdentIdsByModule, ModuleId, PQModuleName, PackageModuleIds, Symbol};
+use roc_module::symbol::{
+    IdentIdsByModule, LookedupModule, LookedupSymbol, ModuleId, PQModuleName, PackageModuleIds,
+    Symbol,
+};
 use roc_problem::can::{Problem, RuntimeError};
 use roc_region::all::{Loc, Region};
 
@@ -74,7 +77,7 @@ impl<'a> Env<'a> {
         module_name_str: &str,
         ident: &str,
         region: Region,
-    ) -> Result<Symbol, RuntimeError> {
+    ) -> Result<LookedupSymbol, RuntimeError> {
         debug_assert!(
             !module_name_str.is_empty(),
             "Called env.qualified_lookup with an unqualified ident: {ident:?}"
@@ -82,8 +85,10 @@ impl<'a> Env<'a> {
 
         let module_name = ModuleName::from(module_name_str);
 
-        match scope.modules.get_id(&module_name) {
-            Some(module_id) => self.qualified_lookup_help(scope, module_id, ident, region),
+        match scope.modules.lookup(&module_name) {
+            Some(lookedup_module) => {
+                self.qualified_lookup_help(scope, lookedup_module, ident, region)
+            }
             None => Err(RuntimeError::ModuleNotImported {
                 module_name: module_name.clone(),
                 imported_modules: scope
@@ -106,11 +111,11 @@ impl<'a> Env<'a> {
         module_id: ModuleId,
         ident: &str,
         region: Region,
-    ) -> Result<Symbol, RuntimeError> {
-        if !scope.modules.has_id(module_id) {
-            Err(self.module_exists_but_not_imported(scope, module_id, region))
+    ) -> Result<LookedupSymbol, RuntimeError> {
+        if let Some(module) = scope.modules.lookup_by_id(&module_id) {
+            self.qualified_lookup_help(scope, module, ident, region)
         } else {
-            self.qualified_lookup_help(scope, module_id, ident, region)
+            Err(self.module_exists_but_not_imported(scope, module_id, region))
         }
     }
 
@@ -118,18 +123,18 @@ impl<'a> Env<'a> {
     fn qualified_lookup_help(
         &mut self,
         scope: &Scope,
-        module_id: ModuleId,
+        module: LookedupModule,
         ident: &str,
         region: Region,
-    ) -> Result<Symbol, RuntimeError> {
+    ) -> Result<LookedupSymbol, RuntimeError> {
         let is_type_name = ident.starts_with(|c: char| c.is_uppercase());
 
         // You can do qualified lookups on your own module, e.g.
         // if I'm in the Foo module, I can do a `Foo.bar` lookup.
-        if module_id == self.home {
+        if module.id == self.home {
             match scope.locals.ident_ids.get_id(ident) {
                 Some(ident_id) => {
-                    let symbol = Symbol::new(module_id, ident_id);
+                    let symbol = Symbol::new(module.id, ident_id);
 
                     if is_type_name {
                         self.qualified_type_lookups.insert(symbol);
@@ -137,7 +142,7 @@ impl<'a> Env<'a> {
                         self.qualified_value_lookups.insert(symbol);
                     }
 
-                    Ok(symbol)
+                    Ok(LookedupSymbol::no_params(symbol))
                 }
                 None => {
                     let error = RuntimeError::LookupNotInScope {
@@ -157,10 +162,10 @@ impl<'a> Env<'a> {
                 }
             }
         } else {
-            match self.dep_idents.get(&module_id) {
+            match self.dep_idents.get(&module.id) {
                 Some(exposed_ids) => match exposed_ids.get_id(ident) {
                     Some(ident_id) => {
-                        let symbol = Symbol::new(module_id, ident_id);
+                        let symbol = Symbol::new(module.id, ident_id);
 
                         if is_type_name {
                             self.qualified_type_lookups.insert(symbol);
@@ -168,12 +173,12 @@ impl<'a> Env<'a> {
                             self.qualified_value_lookups.insert(symbol);
                         }
 
-                        Ok(symbol)
+                        Ok(module.into_symbol(symbol))
                     }
                     None => Err(RuntimeError::ValueNotExposed {
                         module_name: self
                             .qualified_module_ids
-                            .get_name(module_id)
+                            .get_name(module.id)
                             .expect("Module ID known, but not in the module IDs somehow")
                             .as_inner()
                             .clone(),
@@ -182,7 +187,7 @@ impl<'a> Env<'a> {
                         exposed_values: exposed_ids.exposed_values(),
                     }),
                 },
-                _ => Err(self.module_exists_but_not_imported(scope, module_id, region)),
+                _ => Err(self.module_exists_but_not_imported(scope, module.id, region)),
             }
         }
     }

crates/compiler/can/src/expr.rs

@@ -1884,19 +1884,23 @@ fn canonicalize_var_lookup(
         // Since module_name was nonempty, this is a qualified var.
         // Look it up in the env!
         match env.qualified_lookup(scope, module_name, ident, region) {
-            Ok(symbol) => {
+            Ok(lookedup_symbol) => {
                 output
                     .references
-                    .insert_value_lookup(symbol, QualifiedReference::Qualified);
+                    .insert_value_lookup(lookedup_symbol.symbol, QualifiedReference::Qualified);
 
-                if scope.abilities_store.is_ability_member_name(symbol) {
+                if scope
+                    .abilities_store
+                    .is_ability_member_name(lookedup_symbol.symbol)
+                {
+                    // todo(agus): params for abilities?
                     AbilityMember(
-                        symbol,
+                        lookedup_symbol.symbol,
                         Some(scope.abilities_store.fresh_specialization_id()),
                         var_store.fresh(),
                     )
                 } else {
-                    Var(symbol, var_store.fresh())
+                    Var(lookedup_symbol, var_store.fresh())
                 }
             }
             Err(problem) => {

crates/compiler/collections/src/vec_map.rs

@@ -84,6 +84,13 @@ impl<K: PartialEq, V> VecMap<K, V> {
         }
     }
 
+    pub fn get_with_index(&self, key: &K) -> Option<(usize, &V)> {
+        self.keys
+            .iter()
+            .position(|x| x == key)
+            .map(|index| (index, &self.values[index]))
+    }
+
     pub fn get_mut(&mut self, key: &K) -> Option<&mut V> {
         match self.keys.iter().position(|x| x == key) {
             None => None,
@@ -152,6 +159,12 @@ impl<K: PartialEq, V> VecMap<K, V> {
     }
 }
 
+impl<K, V: PartialEq> VecMap<K, V> {
+    pub fn get_index_by_value(&self, value: &V) -> Option<usize> {
+        self.values.iter().position(|x| x == value)
+    }
+}
+
 impl<K: PartialEq, V> Extend<(K, V)> for VecMap<K, V> {
     #[inline(always)]
     fn extend<T: IntoIterator<Item = (K, V)>>(&mut self, iter: T) {

crates/compiler/module/src/symbol.rs

@@ -622,6 +622,22 @@ impl ModuleIds {
     }
 }
 
+#[derive(Debug, Clone)]
+pub struct LookedupSymbol {
+    pub symbol: Symbol,
+    pub params: Option<Symbol>,
+}
+
+impl LookedupSymbol {
+    pub fn new(symbol: Symbol, params: Option<Symbol>) -> Self {
+        Self { symbol, params }
+    }
+
+    pub fn no_params(symbol: Symbol) -> Self {
+        Self::new(symbol, None)
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct ScopeModules {
     modules: VecMap<ModuleName, ModuleId>,
@@ -629,6 +645,22 @@ pub struct ScopeModules {
     params: Vec<Option<Symbol>>,
 }
 
+pub struct LookedupModule {
+    pub id: ModuleId,
+    pub params: Option<Symbol>,
+}
+
+impl LookedupModule {
+    pub fn into_symbol(&self, symbol: Symbol) -> LookedupSymbol {
+        debug_assert_eq!(symbol.module_id(), self.id);
+
+        LookedupSymbol {
+            symbol,
+            params: self.params,
+        }
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum ScopeModuleSource {
     Builtin,
@@ -637,12 +669,22 @@ pub enum ScopeModuleSource {
 }
 
 impl ScopeModules {
-    pub fn get_id(&self, module_name: &ModuleName) -> Option<ModuleId> {
-        self.modules.get(module_name).copied()
+    pub fn lookup(&self, module_name: &ModuleName) -> Option<LookedupModule> {
+        self.modules
+            .get_with_index(module_name)
+            .map(|(index, module_id)| LookedupModule {
+                id: *module_id,
+                params: self.params.get(index).copied().unwrap(),
+            })
     }
 
-    pub fn has_id(&self, module_id: ModuleId) -> bool {
-        self.sources.contains_key(&module_id)
+    pub fn lookup_by_id(&self, module_id: &ModuleId) -> Option<LookedupModule> {
+        self.modules
+            .get_index_by_value(module_id)
+            .map(|index| LookedupModule {
+                id: *module_id,
+                params: self.params.get(index).copied().unwrap(),
+            })
     }
 
     pub fn available_names(&self) -> impl Iterator<Item = &ModuleName> {