fix: attach Go receiver methods to owner types

__tests__/extraction.test.ts

@@ -657,6 +657,34 @@ func (s *Service) GetUser(id string) (*User, error) {
     expect(methodNode).toBeDefined();
     expect(methodNode?.name).toBe('GetUser');
   });
+
+  it('should attach generic receiver methods to their Go type', () => {
+    const code = `
+package main
+
+type Stack[T any] struct {
+    items []T
+}
+
+func (s *Stack[T]) Push(v T) {
+    s.items = append(s.items, v)
+}
+`;
+    const result = extractFromSource('stack.go', code);
+
+    const stack = result.nodes.find((n) => n.kind === 'struct' && n.name === 'Stack');
+    const push = result.nodes.find((n) => n.kind === 'method' && n.name === 'Push');
+    expect(stack).toBeDefined();
+    expect(push).toBeDefined();
+    expect(push?.qualifiedName).toContain('Stack::Push');
+    expect(result.edges).toContainEqual(
+      expect.objectContaining({
+        source: stack!.id,
+        target: push!.id,
+        kind: 'contains',
+      })
+    );
+  });
 });
 
 describe('Rust Extraction', () => {

__tests__/resolution.test.ts

@@ -853,6 +853,50 @@ func UseAliased() {
       expect(target?.filePath.replace(/\\/g, '/')).toBe('pkgb/lib.go');
     });
 
+    it('links Go receiver methods to owner types across files in the same package (#583)', async () => {
+      fs.writeFileSync(
+        path.join(tempDir, 'go.mod'),
+        'module github.com/example/myproject\n\ngo 1.21\n'
+      );
+      fs.mkdirSync(path.join(tempDir, 'repro'));
+      fs.mkdirSync(path.join(tempDir, 'other'));
+      fs.writeFileSync(
+        path.join(tempDir, 'repro', 'widget.go'),
+        'package repro\n\ntype Widget struct{ name string }\nfunc (w *Widget) Foo() string { return "foo:" + w.name }\n'
+      );
+      fs.writeFileSync(
+        path.join(tempDir, 'repro', 'widget_extra.go'),
+        'package repro\n\nfunc (w *Widget) Bar() string { return "bar:" + w.name }\n'
+      );
+      fs.writeFileSync(
+        path.join(tempDir, 'other', 'widget.go'),
+        'package other\n\ntype Widget struct{ id int }\n'
+      );
+
+      cg = await CodeGraph.init(tempDir, { index: true });
+
+      const widget = cg.getNodesByKind('struct').find((n) => n.name === 'Widget' && n.filePath === 'repro/widget.go');
+      const otherWidget = cg.getNodesByKind('struct').find((n) => n.name === 'Widget' && n.filePath === 'other/widget.go');
+      const methods = cg.getNodesByKind('method').filter((n) => n.qualifiedName.startsWith('Widget::'));
+      const methodNames = methods.map((n) => n.name).sort();
+      expect(widget).toBeDefined();
+      expect(otherWidget).toBeDefined();
+      expect(methodNames).toEqual(['Bar', 'Foo']);
+
+      const containedMethodNames = cg.getOutgoingEdges(widget!.id)
+        .filter((edge) => edge.kind === 'contains')
+        .map((edge) => cg.getNode(edge.target)?.name)
+        .filter(Boolean)
+        .sort();
+      expect(containedMethodNames).toEqual(['Bar', 'Foo']);
+
+      const otherContainedMethodNames = cg.getOutgoingEdges(otherWidget!.id)
+        .filter((edge) => edge.kind === 'contains')
+        .map((edge) => cg.getNode(edge.target)?.name)
+        .filter(Boolean);
+      expect(otherContainedMethodNames).toEqual([]);
+    });
+
     it('TS type_alias object-shape members resolve method calls (#359)', async () => {
       // Pre-#359, `recorder.stop()` (recorder: RecorderHandle) attached
       // to `StdioMcpClient.stop` in a sibling directory via path-proximity

src/extraction/languages/go.ts

@@ -56,8 +56,9 @@ export const goExtractor: LanguageExtractor = {
     if (!receiver) return undefined;
     // Find the type identifier inside the receiver
     const text = getNodeText(receiver, source);
-    // Extract type name from patterns like "(sl *Type)", "(sl Type)", "(*Type)", "(Type)"
-    const match = text.match(/\*?\s*([A-Za-z_][A-Za-z0-9_]*)\s*\)/);
+    // Extract type name from patterns like "(sl *Type)", "(sl Type)",
+    // "(*Type)", "(Type)", and generic receivers like "(s *Stack[T])".
+    const match = text.match(/\(\s*(?:[A-Za-z_][A-Za-z0-9_]*\s+)?\*?\s*([A-Za-z_][A-Za-z0-9_]*)/);
     return match?.[1];
   },
 };

src/resolution/index.ts

@@ -256,10 +256,73 @@ export class ReferenceResolver {
         });
       }
     }
+    updated += this.linkGoReceiverMethodOwners();
     if (updated > 0) this.clearCaches();
     return updated;
   }
 
+  private linkGoReceiverMethodOwners(): number {
+    const methods = this.queries.getNodesByKind('method')
+      .filter((node) => node.language === 'go' && node.qualifiedName.includes('::'));
+    if (methods.length === 0) return 0;
+
+    const ownersByName = new Map<string, Node[]>();
+    for (const kind of ['struct', 'class', 'enum', 'trait'] as const) {
+      for (const owner of this.queries.getNodesByKind(kind)) {
+        if (owner.language !== 'go') continue;
+        const existing = ownersByName.get(owner.name) ?? [];
+        existing.push(owner);
+        ownersByName.set(owner.name, existing);
+      }
+    }
+
+    const packageNameCache = new Map<string, string | null>();
+    const packageName = (filePath: string): string | null => {
+      if (packageNameCache.has(filePath)) return packageNameCache.get(filePath)!;
+      const source = this.context.readFile(filePath);
+      const match = source?.match(/^\s*package\s+([A-Za-z_][A-Za-z0-9_]*)/m);
+      const name = match?.[1] ?? null;
+      packageNameCache.set(filePath, name);
+      return name;
+    };
+
+    const edges: Edge[] = [];
+    for (const method of methods) {
+      const receiverType = method.qualifiedName.split('::', 1)[0];
+      if (!receiverType) continue;
+
+      const alreadyOwned = this.queries.getIncomingEdges(method.id, ['contains'])
+        .some((edge) => {
+          const source = this.queries.getNodeById(edge.source);
+          return source && source.language === 'go' && source.name === receiverType;
+        });
+      if (alreadyOwned) continue;
+
+      const methodDir = path.dirname(method.filePath);
+      const methodPackage = packageName(method.filePath);
+      if (!methodPackage) continue;
+
+      const owner = (ownersByName.get(receiverType) ?? []).find((candidate) =>
+        path.dirname(candidate.filePath) === methodDir &&
+        packageName(candidate.filePath) === methodPackage
+      );
+      if (!owner) continue;
+
+      edges.push({
+        source: owner.id,
+        target: method.id,
+        kind: 'contains',
+        provenance: 'heuristic',
+        metadata: { synthesizedBy: 'go-receiver-owner' },
+      });
+    }
+
+    if (edges.length > 0) {
+      this.queries.insertEdges(edges);
+    }
+    return edges.length;
+  }
+
   /**
    * Pre-build lightweight caches for resolution.
    * Node lookups are now handled by indexed SQLite queries instead of