case *ast.IndexListExpr:
		f.walk(&n.X, ctxExpr, visit)
		f.walk(n.Indices, ctxExpr, visit)
	}
}

func funcTypeTypeParams(n *ast.FuncType) *ast.FieldList {
	return n.TypeParams
}

func typeSpecTypeParams(n *ast.TypeSpec) *ast.FieldList {
	return n.TypeParams

[`Scope.Children`](/pkg/go/types#Scope.Children),
[`Struct.Fields`](/pkg/go/types#Struct.Fields),
[`Tuple.Variables`](/pkg/go/types#Tuple.Variables),
[`TypeList.Types`](/pkg/go/types#TypeList.Types),
[`TypeParamList.TypeParams`](/pkg/go/types#TypeParamList.TypeParams),

pkg go/ast, type FuncType struct, TypeParams *FieldList
pkg go/ast, type IndexListExpr struct
pkg go/ast, type IndexListExpr struct, Indices []Expr
pkg go/ast, type IndexListExpr struct, Lbrack token.Pos
pkg go/ast, type IndexListExpr struct, Rbrack token.Pos
pkg go/ast, type IndexListExpr struct, X Expr
pkg go/ast, type TypeSpec struct, TypeParams *FieldList
pkg go/constant, method (Kind) String() string

pkg go/types, method (*Struct) Fields() iter.Seq[*Var] #66626
pkg go/types, method (*Tuple) Variables() iter.Seq[*Var] #66626
pkg go/types, method (*TypeList) Types() iter.Seq[Type] #66626
pkg go/types, method (*TypeParamList) TypeParams() iter.Seq[*TypeParam] #66626

     */
    @Override
    Type getGenericReturnType() {
      Class<?> declaringClass = getDeclaringClass();
      TypeVariable<?>[] typeParams = declaringClass.getTypeParameters();
      if (typeParams.length > 0) {
        return Types.newParameterizedType(declaringClass, typeParams);
      } else {
        return declaringClass;
      }
    }

    @Override
    Type[] getGenericParameterTypes() {

pkg go/types, method (*Alias) Rhs() Type #66559
pkg go/types, method (*Alias) SetTypeParams([]*TypeParam) #67143
pkg go/types, method (*Alias) TypeArgs() *TypeList #67143
pkg go/types, method (*Alias) TypeParams() *TypeParamList #67143
pkg go/types, method (*Func) Signature() *Signature #65772
pkg iter, func Pull2[$0 interface{}, $1 interface{}](Seq2[$0, $1]) (func() ($0, $1, bool), func()) #61897

		fmt.Fprintf(buf, "$%d", typ.Index())

	default:
		panic(fmt.Sprintf("unknown type %T", typ))
	}
}

func (w *Walker) writeSignature(buf *bytes.Buffer, sig *types.Signature) {
	if tparams := sig.TypeParams(); tparams != nil {
		w.writeTypeParams(buf, tparams, true)
	}
	w.writeParams(buf, sig.Params(), sig.Variadic())
	switch res := sig.Results(); res.Len() {
	case 0:
		// nothing to do
	case 1: