Merge pull request rust-lang#18699 from Veykril/push-ltqwwusvtlot

fix: Fix path qualified auto-importing completions not working with re-exports

Author: Veykril

src/tools/rust-analyzer/crates/hir/src/lib.rs

@@ -3105,10 +3105,10 @@ impl From<ModuleDef> for ItemInNs {
 }
 
 impl ItemInNs {
-    pub fn as_module_def(self) -> Option<ModuleDef> {
+    pub fn into_module_def(self) -> ModuleDef {
         match self {
-            ItemInNs::Types(id) | ItemInNs::Values(id) => Some(id),
-            ItemInNs::Macros(_) => None,
+            ItemInNs::Types(id) | ItemInNs::Values(id) => id,
+            ItemInNs::Macros(id) => ModuleDef::Macro(id),
         }
     }
 

src/tools/rust-analyzer/crates/hir/src/semantics.rs

@@ -39,8 +39,8 @@ use stdx::TupleExt;
 use syntax::{
     algo::skip_trivia_token,
     ast::{self, HasAttrs as _, HasGenericParams},
-    AstNode, AstToken, Direction, SyntaxKind, SyntaxNode, SyntaxNodePtr, SyntaxToken, TextRange,
-    TextSize,
+    AstNode, AstToken, Direction, SmolStr, SyntaxKind, SyntaxNode, SyntaxNodePtr, SyntaxToken,
+    TextRange, TextSize,
 };
 use triomphe::Arc;
 
@@ -1540,6 +1540,21 @@ impl<'db> SemanticsImpl<'db> {
         Some(items.iter_items().map(|(item, _)| item.into()))
     }
 
+    pub fn resolve_mod_path_relative(
+        &self,
+        to: Module,
+        segments: impl IntoIterator<Item = SmolStr>,
+    ) -> Option<impl Iterator<Item = ItemInNs>> {
+        let items = to.id.resolver(self.db.upcast()).resolve_module_path_in_items(
+            self.db.upcast(),
+            &ModPath::from_segments(
+                hir_def::path::PathKind::Plain,
+                segments.into_iter().map(|it| Name::new(&it, SyntaxContextId::ROOT)),
+            ),
+        );
+        Some(items.iter_items().map(|(item, _)| item.into()))
+    }
+
     fn resolve_variant(&self, record_lit: ast::RecordExpr) -> Option<VariantId> {
         self.analyze(record_lit.syntax())?.resolve_variant(self.db, record_lit)
     }

src/tools/rust-analyzer/crates/ide-assists/src/handlers/qualify_method_call.rs

@@ -86,7 +86,7 @@ fn item_for_path_search(db: &dyn HirDatabase, item: ItemInNs) -> Option<ItemInNs
 }
 
 fn item_as_assoc(db: &dyn HirDatabase, item: ItemInNs) -> Option<AssocItem> {
-    item.as_module_def().and_then(|module_def| module_def.as_assoc_item(db))
+    item.into_module_def().as_assoc_item(db)
 }
 
 #[cfg(test)]

src/tools/rust-analyzer/crates/ide-assists/src/handlers/qualify_path.rs

@@ -51,7 +51,7 @@ pub(crate) fn qualify_path(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option
     let candidate = import_assets.import_candidate();
     let qualify_candidate = match syntax_under_caret.clone() {
         NodeOrToken::Node(syntax_under_caret) => match candidate {
-            ImportCandidate::Path(candidate) if candidate.qualifier.is_some() => {
+            ImportCandidate::Path(candidate) if !candidate.qualifier.is_empty() => {
                 cov_mark::hit!(qualify_path_qualifier_start);
                 let path = ast::Path::cast(syntax_under_caret)?;
                 let (prev_segment, segment) = (path.qualifier()?.segment()?, path.segment()?);
@@ -219,11 +219,9 @@ fn find_trait_method(
 }
 
 fn item_as_trait(db: &RootDatabase, item: hir::ItemInNs) -> Option<hir::Trait> {
-    let item_module_def = item.as_module_def()?;
-
-    match item_module_def {
+    match item.into_module_def() {
         hir::ModuleDef::Trait(trait_) => Some(trait_),
-        _ => item_module_def.as_assoc_item(db)?.container_trait(db),
+        item_module_def => item_module_def.as_assoc_item(db)?.container_trait(db),
     }
 }
 
@@ -247,7 +245,7 @@ fn label(
     let import_path = &import.import_path;
 
     match candidate {
-        ImportCandidate::Path(candidate) if candidate.qualifier.is_none() => {
+        ImportCandidate::Path(candidate) if candidate.qualifier.is_empty() => {
             format!("Qualify as `{}`", import_path.display(db, edition))
         }
         _ => format!("Qualify with `{}`", import_path.display(db, edition)),

src/tools/rust-analyzer/crates/ide-assists/src/handlers/replace_derive_with_manual_impl.rs

@@ -78,7 +78,7 @@ pub(crate) fn replace_derive_with_manual_impl(
         NameToImport::exact_case_sensitive(path.segments().last()?.to_string()),
         items_locator::AssocSearchMode::Exclude,
     )
-    .filter_map(|item| match item.as_module_def()? {
+    .filter_map(|item| match item.into_module_def() {
         ModuleDef::Trait(trait_) => Some(trait_),
         _ => None,
     })

src/tools/rust-analyzer/crates/ide-assists/src/handlers/wrap_return_type.rs

@@ -198,7 +198,7 @@ fn wrapper_alias(
     );
 
     ctx.sema.resolve_mod_path(ret_type.syntax(), &wrapper_path).and_then(|def| {
-        def.filter_map(|def| match def.as_module_def()? {
+        def.filter_map(|def| match def.into_module_def() {
             hir::ModuleDef::TypeAlias(alias) => {
                 let enum_ty = alias.ty(ctx.db()).as_adt()?.as_enum()?;
                 (&enum_ty == core_wrapper).then_some(alias)

src/tools/rust-analyzer/crates/ide-completion/src/tests/flyimport.rs

@@ -1720,3 +1720,45 @@ fn function() {
         "#]],
     );
 }
+
+#[test]
+fn intrinsics() {
+    check(
+        r#"
+    //- /core.rs crate:core
+    pub mod intrinsics {
+        extern "rust-intrinsic" {
+            pub fn transmute<Src, Dst>(src: Src) -> Dst;
+        }
+    }
+    pub mod mem {
+        pub use crate::intrinsics::transmute;
+    }
+    //- /main.rs crate:main deps:core
+    fn function() {
+            transmute$0
+    }
+    "#,
+        expect![[r#"
+                fn transmute(…) (use core::mem::transmute) unsafe fn(Src) -> Dst
+            "#]],
+    );
+    check(
+        r#"
+//- /core.rs crate:core
+pub mod intrinsics {
+    extern "rust-intrinsic" {
+        pub fn transmute<Src, Dst>(src: Src) -> Dst;
+    }
+}
+pub mod mem {
+    pub use crate::intrinsics::transmute;
+}
+//- /main.rs crate:main deps:core
+fn function() {
+        mem::transmute$0
+}
+"#,
+        expect![""],
+    );
+}