internal: Enforce Resolver to always have a module scope

crates/hir_ty/src/chalk_db.rs

@@ -420,9 +420,8 @@ pub(crate) fn associated_ty_data_query(
         .collect();
 
     if !ctx.unsized_types.borrow().contains(&self_ty) {
-        let sized_trait = resolver
-            .krate()
-            .and_then(|krate| db.lang_item(krate, SmolStr::new_inline("sized")))
+        let sized_trait = db
+            .lang_item(resolver.krate(), SmolStr::new_inline("sized"))
             .and_then(|lang_item| lang_item.as_trait().map(to_chalk_trait_id));
         let sized_bound = sized_trait.into_iter().map(|sized_trait| {
             let trait_bound =

crates/hir_ty/src/infer.rs

@@ -762,7 +762,7 @@ impl<'a> InferenceContext<'a> {
     }
 
     fn resolve_lang_item(&self, name: Name) -> Option<LangItemTarget> {
-        let krate = self.resolver.krate()?;
+        let krate = self.resolver.krate();
         self.db.lang_item(krate, name.to_smol_str())
     }
 

crates/hir_ty/src/infer/expr.rs

@@ -29,7 +29,7 @@ use crate::{
         const_or_path_to_chalk, generic_arg_to_chalk, lower_to_chalk_mutability, ParamLoweringMode,
     },
     mapping::{from_chalk, ToChalk},
-    method_resolution,
+    method_resolution::{self, VisibleFromModule},
     primitive::{self, UintTy},
     static_lifetime, to_chalk_trait_id,
     utils::{generics, Generics},
@@ -487,13 +487,8 @@ impl<'a> InferenceContext<'a> {
                         }
                         _ => return None,
                     };
-                    let module = self.resolver.module();
-                    let is_visible = module
-                        .map(|mod_id| {
-                            self.db.field_visibilities(field_id.parent)[field_id.local_id]
-                                .is_visible_from(self.db.upcast(), mod_id)
-                        })
-                        .unwrap_or(true);
+                    let is_visible = self.db.field_visibilities(field_id.parent)[field_id.local_id]
+                        .is_visible_from(self.db.upcast(), self.resolver.module());
                     if !is_visible {
                         // Write down the first field resolution even if it is not visible
                         // This aids IDE features for private fields like goto def and in
@@ -946,7 +941,7 @@ impl<'a> InferenceContext<'a> {
             self.db,
             self.trait_env.clone(),
             &traits_in_scope,
-            self.resolver.module().into(),
+            VisibleFromModule::Filter(self.resolver.module()),
             method_name,
         );
         let (receiver_ty, method_ty, substs) = match resolved {

crates/hir_ty/src/infer/path.rs

@@ -9,8 +9,11 @@ use hir_def::{
 use hir_expand::name::Name;
 
 use crate::{
-    builder::ParamKind, consteval, method_resolution, GenericArgData, Interner, Substitution,
-    TraitRefExt, Ty, TyBuilder, TyExt, TyKind, ValueTyDefId,
+    builder::ParamKind,
+    consteval,
+    method_resolution::{self, VisibleFromModule},
+    GenericArgData, Interner, Substitution, TraitRefExt, Ty, TyBuilder, TyExt, TyKind,
+    ValueTyDefId,
 };
 
 use super::{ExprOrPatId, InferenceContext, TraitRef};
@@ -231,7 +234,7 @@ impl<'a> InferenceContext<'a> {
             self.db,
             self.table.trait_env.clone(),
             &traits_in_scope,
-            self.resolver.module().into(),
+            VisibleFromModule::Filter(self.resolver.module()),
             Some(name),
             method_resolution::LookupMode::Path,
             move |_ty, item| {

crates/hir_ty/src/lower.rs

@@ -335,12 +335,13 @@ impl<'a> TyLoweringContext<'a> {
                     let mut expander = self.expander.borrow_mut();
                     if expander.is_some() {
                         (Some(expander), false)
-                    } else if let Some(module_id) = self.resolver.module() {
-                        *expander =
-                            Some(Expander::new(self.db.upcast(), macro_call.file_id, module_id));
-                        (Some(expander), true)
                     } else {
-                        (None, false)
+                        *expander = Some(Expander::new(
+                            self.db.upcast(),
+                            macro_call.file_id,
+                            self.resolver.module(),
+                        ));
+                        (Some(expander), true)
                     }
                 };
                 let ty = if let Some(mut expander) = expander {
@@ -860,9 +861,8 @@ impl<'a> TyLoweringContext<'a> {
             }
             TypeBound::Path(path, TraitBoundModifier::Maybe) => {
                 let sized_trait = self
-                    .resolver
-                    .krate()
-                    .and_then(|krate| self.db.lang_item(krate, SmolStr::new_inline("sized")))
+                    .db
+                    .lang_item(self.resolver.krate(), SmolStr::new_inline("sized"))
                     .and_then(|lang_item| lang_item.as_trait());
                 // Don't lower associated type bindings as the only possible relaxed trait bound
                 // `?Sized` has no of them.
@@ -1268,9 +1268,8 @@ fn implicitly_sized_clauses<'a>(
 ) -> impl Iterator<Item = WhereClause> + 'a {
     let is_trait_def = matches!(def, GenericDefId::TraitId(..));
     let generic_args = &substitution.as_slice(Interner)[is_trait_def as usize..];
-    let sized_trait = resolver
-        .krate()
-        .and_then(|krate| db.lang_item(krate, SmolStr::new_inline("sized")))
+    let sized_trait = db
+        .lang_item(resolver.krate(), SmolStr::new_inline("sized"))
         .and_then(|lang_item| lang_item.as_trait().map(to_chalk_trait_id));
 
     sized_trait.into_iter().flat_map(move |sized_trait| {