}
			}
		}
	}
	return v
}

func loadTypes(path, pkgName string, v visitor) {
	fset := token.NewFileSet()

	filter := func(fi fs.FileInfo) bool {
		return strings.HasSuffix(fi.Name(), ".go")
	}
	pkgs, err := parser.ParseDir(fset, path, filter, 0)
	if err != nil {
		panic(err)
	}

	pkg := pkgs[pkgName]

	for _, f := range pkg.Files {
		ast.Walk(v, f)
	}
}

					obj := uses[x]
					if obj == nil {
						t.Errorf("%s: unresolved qualified identifier %s", fset.Position(x.Pos()), x.Name)
						return false
					}
					if _, ok := obj.(*PkgName); ok && uses[s.Sel] == nil {
						t.Errorf("%s: unresolved selector %s", fset.Position(s.Sel.Pos()), s.Sel.Name)
						return false
					}
					return false
				}
				return true
			}
			return true

}

func (*Tree[R]) N(r R) R { return r }

type Node[T any] struct {
	*Tree[T]
}

func (Node[Q]) M(Q) {}

type Inst = *Tree[int]
`

	f := mustParse(src)
	pkg := NewPackage("p", f.PkgName.Value)
	if err := NewChecker(nil, pkg, nil).Files([]*syntax.File{f}); err != nil {
		t.Fatal(err)
	}

	firstFieldType := func(n *Named) *Named {

	incfg := filepath.Join(outdir, tag+"incfg.txt")
	outcfg := filepath.Join(outdir, "outcfg.txt")
	p := covcmd.CoverPkgConfig{
		PkgPath:      ppath,
		PkgName:      pname,
		Granularity:  gran,
		OutConfig:    outcfg,
		EmitMetaFile: mpath,
	}
	data, err := json.Marshal(p)
	if err != nil {
		t.Fatalf("json.Marshal failed: %v", err)
	}
	writeFile(t, incfg, data)

func TestIssue65898(t *testing.T) {
	const src = `
package p
func _[A any](A) {}
`

	fset := token.NewFileSet()
	f := mustParse(fset, src)

	var conf types.Config
	pkg, err := conf.Check(pkgName(src), fset, []*ast.File{f}, nil)
	if err != nil {
		t.Fatal(err)
	}

	for _, d := range f.Decls {
		if fun, _ := d.(*ast.FuncDecl); fun != nil {