Auto merge of #15901 - Veykril:inner-diag, r=lnicola

fix: Diagnose everything in nested items, not just def diagnostics

Turns out we only calculated def diagnostics for these before (was wondering why I wasn't getting any type mismatches)

crates/hir-ty/src/diagnostics/decl_check.rs

@@ -19,8 +19,8 @@ use hir_def::{
     data::adt::VariantData,
     hir::{Pat, PatId},
     src::HasSource,
-    AdtId, AttrDefId, ConstId, DefWithBodyId, EnumId, EnumVariantId, FunctionId, ItemContainerId,
-    Lookup, ModuleDefId, ModuleId, StaticId, StructId,
+    AdtId, AttrDefId, ConstId, EnumId, FunctionId, ItemContainerId, Lookup, ModuleDefId, ModuleId,
+    StaticId, StructId,
 };
 use hir_expand::{
     name::{AsName, Name},
@@ -290,8 +290,6 @@ impl<'a> DeclValidator<'a> {
             return;
         }
 
-        self.validate_body_inner_items(func.into());
-
         // Check whether non-snake case identifiers are allowed for this function.
         if self.allowed(func.into(), allow::NON_SNAKE_CASE, false) {
             return;
@@ -568,11 +566,6 @@ impl<'a> DeclValidator<'a> {
     fn validate_enum(&mut self, enum_id: EnumId) {
         let data = self.db.enum_data(enum_id);
 
-        for (local_id, _) in data.variants.iter() {
-            let variant_id = EnumVariantId { parent: enum_id, local_id };
-            self.validate_body_inner_items(variant_id.into());
-        }
-
         // Check whether non-camel case names are allowed for this enum.
         if self.allowed(enum_id.into(), allow::NON_CAMEL_CASE_TYPES, false) {
             return;
@@ -697,8 +690,6 @@ impl<'a> DeclValidator<'a> {
     fn validate_const(&mut self, const_id: ConstId) {
         let data = self.db.const_data(const_id);
 
-        self.validate_body_inner_items(const_id.into());
-
         if self.allowed(const_id.into(), allow::NON_UPPER_CASE_GLOBAL, false) {
             return;
         }
@@ -747,8 +738,6 @@ impl<'a> DeclValidator<'a> {
             return;
         }
 
-        self.validate_body_inner_items(static_id.into());
-
         if self.allowed(static_id.into(), allow::NON_UPPER_CASE_GLOBAL, false) {
             return;
         }
@@ -786,17 +775,4 @@ impl<'a> DeclValidator<'a> {
 
         self.sink.push(diagnostic);
     }
-
-    // FIXME: We don't currently validate names within `DefWithBodyId::InTypeConstId`.
-    /// Recursively validates inner scope items, such as static variables and constants.
-    fn validate_body_inner_items(&mut self, body_id: DefWithBodyId) {
-        let body = self.db.body(body_id);
-        for (_, block_def_map) in body.blocks(self.db.upcast()) {
-            for (_, module) in block_def_map.modules() {
-                for def_id in module.scope.declarations() {
-                    self.validate_item(def_id);
-                }
-            }
-        }
-    }
 }

crates/hir/src/lib.rs

@@ -1537,9 +1537,7 @@ impl DefWithBody {
         let (body, source_map) = db.body_with_source_map(self.into());
 
         for (_, def_map) in body.blocks(db.upcast()) {
-            for diag in def_map.diagnostics() {
-                emit_def_diagnostic(db, acc, diag);
-            }
+            Module { id: def_map.module_id(DefMap::ROOT) }.diagnostics(db, acc);
         }
 
         for diag in source_map.diagnostics() {

crates/ide-diagnostics/src/handlers/incorrect_case.rs

@@ -599,12 +599,12 @@ fn main() {
              //^^^ 💡 warn: Static variable `bar` should have UPPER_SNAKE_CASE name, e.g. `BAR`
         fn BAZ() {
          //^^^ 💡 warn: Function `BAZ` should have snake_case name, e.g. `baz`
-            let INNER_INNER = 42;
-              //^^^^^^^^^^^ 💡 warn: Variable `INNER_INNER` should have snake_case name, e.g. `inner_inner`
+            let _INNER_INNER = 42;
+              //^^^^^^^^^^^^ 💡 warn: Variable `_INNER_INNER` should have snake_case name, e.g. `_inner_inner`
         }
 
-        let INNER_LOCAL = 42;
-          //^^^^^^^^^^^ 💡 warn: Variable `INNER_LOCAL` should have snake_case name, e.g. `inner_local`
+        let _INNER_LOCAL = 42;
+          //^^^^^^^^^^^^ 💡 warn: Variable `_INNER_LOCAL` should have snake_case name, e.g. `_inner_local`
     }
 }
 "#,

crates/ide-diagnostics/src/handlers/type_mismatch.rs

@@ -739,6 +739,21 @@ fn f() -> i32 {
     0
 }
 fn g() { return; }
+"#,
+        );
+    }
+
+    #[test]
+    fn smoke_test_inner_items() {
+        check_diagnostics(
+            r#"
+fn f() {
+    fn inner() -> i32 {
+        return;
+     // ^^^^^^ error: expected i32, found ()
+        0
+    }
+}
 "#,
         );
     }