test:add test of overload function definition

gopls/internal/lsp/source/definition_gox.go

@@ -80,15 +80,14 @@ func GopDefinition(ctx context.Context, snapshot Snapshot, fh FileHandle, positi
 
 	// The general case: the cursor is on an identifier.
 	_, obj, _ := gopReferencedObject(pkg, pgf, pos)
-
 	if obj == nil {
 		return nil, nil
 	}
 
 	anonyOvId := false
 	if fun, ok := obj.(*types.Func); ok {
-		for _, ov := range pkg.GopTypesInfo().Implicits {
-			if v, ok := ov.(*types.Func); ok {
+		for ov := range pkg.GopTypesInfo().Implicits {
+			if v, ok := ov.(*ast.FuncLit); ok {
 				if v.Pos() == fun.Pos() {
 					anonyOvId = true
 					break

gopls/internal/regtest/misc/definition_gox_test.go

@@ -0,0 +1,141 @@
+package misc
+
+import (
+	"testing"
+
+	. "golang.org/x/tools/gopls/internal/lsp/regtest"
+)
+
+const overloadDefinition1 = `
+-- go.mod --
+module mod.com
+
+go 1.21.4
+-- def.gop --
+func add = (
+	func(a, b int) int {
+ 		return a + b
+   	}
+   	func(a, b string) string {
+   		return a + b
+   	}
+)
+-- test.gop --
+println add(100, 7)
+`
+
+const overloadDefinition2 = `
+-- go.mod --
+module mod.com
+
+go 1.21.4
+-- def.gop --
+func mulInt(a, b int) int {
+	return a * b
+}
+
+func mulFloat(a, b float64) float64 {
+	return a * b
+}
+
+func mul = (
+	mulInt
+	mulFloat
+)
+-- test.gop --
+println mul(100, 7)
+`
+
+const overloadDefinition3 = `
+-- go.mod --
+module mod.com
+
+go 1.21.4
+-- def.gop --
+type foo struct {
+}
+
+func (a *foo) mulInt(b int) *foo {
+	return a
+}
+
+func (a *foo) mulFoo(b *foo) *foo {
+	return a
+}
+
+func (foo).mul = (
+	(foo).mulInt
+	(foo).mulFoo
+)
+-- test.gop --
+var a *foo
+var c = a.mul(100)
+`
+
+const overloadDefinition4 = `
+-- go.mod --
+module mod.com
+
+go 1.21.4
+-- def.go --
+package main
+type foo struct {
+}
+
+func (f *foo) Broadcast__0(msg string) bool {
+	return true
+}
+-- test.gop --
+var a *foo
+a.Broadcast("hhh")
+`
+
+func TestOverloadDefinition(t *testing.T) {
+	Run(t, overloadDefinition1, func(t *testing.T, env *Env) {
+		env.OpenFile("test.gop")
+		loc := env.GoToDefinition(env.RegexpSearch("test.gop", "add"))
+		name := env.Sandbox.Workdir.URIToPath(loc.URI)
+		if want := "def.gop"; name != want {
+			t.Errorf("GoToDefinition: got file %q, want %q", name, want)
+		}
+		// goxls : match the 'func' position of the corresponding overloaded function
+		if want := env.RegexpSearch("def.gop", `(func)\(a, b int\) int`); loc != want {
+			t.Errorf("GoToDefinition: got location %v, want %v", loc, want)
+		}
+	})
+	Run(t, overloadDefinition2, func(t *testing.T, env *Env) {
+		env.OpenFile("test.gop")
+		loc := env.GoToDefinition(env.RegexpSearch("test.gop", `println (mul)\(100, 7\)`))
+		name := env.Sandbox.Workdir.URIToPath(loc.URI)
+		if want := "def.gop"; name != want {
+			t.Errorf("GoToDefinition: got file %q, want %q", name, want)
+		}
+		// goxls: match mulInt
+		if want := env.RegexpSearch("def.gop", `func (mulInt)\(a, b int\) int`); loc != want {
+			t.Errorf("GoToDefinition: got location %v, want %v", loc, want)
+		}
+	})
+	Run(t, overloadDefinition3, func(t *testing.T, env *Env) {
+		env.OpenFile("test.gop")
+		loc := env.GoToDefinition(env.RegexpSearch("test.gop", "mul"))
+		name := env.Sandbox.Workdir.URIToPath(loc.URI)
+		if want := "def.gop"; name != want {
+			t.Errorf("GoToDefinition: got file %q, want %q", name, want)
+		}
+		// goxls: match mulInt
+		if want := env.RegexpSearch("def.gop", `func \(a \*foo\) (mulInt)\(b int\) \*foo`); loc != want {
+			t.Errorf("GoToDefinition: got location %v, want %v", loc, want)
+		}
+	})
+	Run(t, overloadDefinition4, func(t *testing.T, env *Env) {
+		env.OpenFile("test.gop")
+		loc := env.GoToDefinition(env.RegexpSearch("test.gop", "Broadcast"))
+		name := env.Sandbox.Workdir.URIToPath(loc.URI)
+		if want := "def.go"; name != want {
+			t.Errorf("GoToDefinition: got file %q, want %q", name, want)
+		}
+		if want := env.RegexpSearch("def.go", `Broadcast__0`); loc != want {
+			t.Errorf("GoToDefinition: got location %v, want %v", loc, want)
+		}
+	})
+}