Don't redo field resolution in the IDE

crates/ra_hir/src/code_model.rs

@@ -510,7 +510,7 @@ impl VariantDef {
         }
     }
 
-    pub fn field(self, db: &impl HirDatabase, name: &Name) -> Option<StructField> {
+    pub(crate) fn field(self, db: &impl HirDatabase, name: &Name) -> Option<StructField> {
         match self {
             VariantDef::Struct(it) => it.field(db, name),
             VariantDef::EnumVariant(it) => it.field(db, name),

crates/ra_hir/src/source_binder.rs

@@ -216,6 +216,11 @@ impl SourceAnalyzer {
         self.infer.as_ref()?.field_resolution(expr_id)
     }
 
+    pub fn resolve_record_field(&self, field: &ast::RecordField) -> Option<crate::StructField> {
+        let expr_id = self.expr_id(&field.expr()?)?;
+        self.infer.as_ref()?.record_field_resolution(expr_id)
+    }
+
     pub fn resolve_record_literal(&self, record_lit: &ast::RecordLit) -> Option<crate::VariantDef> {
         let expr_id = self.expr_id(&record_lit.clone().into())?;
         self.infer.as_ref()?.variant_resolution_for_expr(expr_id)

crates/ra_hir/src/ty/infer.rs

@@ -126,6 +126,8 @@ pub struct InferenceResult {
     method_resolutions: FxHashMap<ExprId, Function>,
     /// For each field access expr, records the field it resolves to.
     field_resolutions: FxHashMap<ExprId, StructField>,
+    /// For each field in record literal, records the field it resolves to.
+    record_field_resolutions: FxHashMap<ExprId, StructField>,
     /// For each struct literal, records the variant it resolves to.
     variant_resolutions: FxHashMap<ExprOrPatId, VariantDef>,
     /// For each associated item record what it resolves to
@@ -143,6 +145,9 @@ impl InferenceResult {
     pub fn field_resolution(&self, expr: ExprId) -> Option<StructField> {
         self.field_resolutions.get(&expr).copied()
     }
+    pub fn record_field_resolution(&self, expr: ExprId) -> Option<StructField> {
+        self.record_field_resolutions.get(&expr).copied()
+    }
     pub fn variant_resolution_for_expr(&self, id: ExprId) -> Option<VariantDef> {
         self.variant_resolutions.get(&id.into()).copied()
     }

crates/ra_hir/src/ty/infer/expr.rs

@@ -215,8 +215,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
 
                 let substs = ty.substs().unwrap_or_else(Substs::empty);
                 for (field_idx, field) in fields.iter().enumerate() {
-                    let field_ty = def_id
+                    let field_def = def_id.and_then(|it| match it.field(self.db, &field.name) {
-                        .and_then(|it| match it.field(self.db, &field.name) {
                         Some(field) => Some(field),
                         None => {
                             self.push_diagnostic(InferenceDiagnostic::NoSuchField {
@@ -225,9 +224,12 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                             });
                             None
                         }
-                        })
+                    });
-                        .map_or(Ty::Unknown, |field| field.ty(self.db))
+                    if let Some(field_def) = field_def {
-                        .subst(&substs);
+                        self.result.record_field_resolutions.insert(field.expr, field_def);
+                    }
+                    let field_ty =
+                        field_def.map_or(Ty::Unknown, |field| field.ty(self.db)).subst(&substs);
                     self.infer_expr_coerce(field.expr, &Expectation::has_type(field_ty));
                 }
                 if let Some(expr) = spread {

crates/ra_hir_def/src/path.rs

@@ -195,7 +195,7 @@ impl Path {
     }
 
     /// Converts an `ast::NameRef` into a single-identifier `Path`.
-    pub fn from_name_ref(name_ref: &ast::NameRef) -> Path {
+    pub(crate) fn from_name_ref(name_ref: &ast::NameRef) -> Path {
         name_ref.as_name().into()
     }
 

crates/ra_ide_api/src/references/classify.rs

@@ -1,6 +1,6 @@
 //! Functions that are used to classify an element from its definition or reference.
 
-use hir::{FromSource, Module, ModuleSource, Path, PathResolution, Source, SourceAnalyzer};
+use hir::{FromSource, Module, ModuleSource, PathResolution, Source, SourceAnalyzer};
 use ra_prof::profile;
 use ra_syntax::{ast, match_ast, AstNode};
 use test_utils::tested_by;
@@ -140,12 +140,8 @@ pub(crate) fn classify_name_ref(
 
     if let Some(record_field) = ast::RecordField::cast(parent.clone()) {
         tested_by!(goto_definition_works_for_record_fields);
-        if let Some(record_lit) = record_field.syntax().ancestors().find_map(ast::RecordLit::cast) {
+        if let Some(field_def) = analyzer.resolve_record_field(&record_field) {
-            let variant_def = analyzer.resolve_record_literal(&record_lit)?;
+            return Some(from_struct_field(db, field_def));
-            let hir_path = Path::from_name_ref(name_ref.value);
-            let hir_name = hir_path.as_ident()?;
-            let field = variant_def.field(db, hir_name)?;
-            return Some(from_struct_field(db, field));
         }
     }