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// -lang=go1.17
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Parser accepts type parameters but the type checker
// needs to report any operations that are not permitted
// before Go 1.18.
package p
type T[P /* ERROR "type parameter requires go1.18 or later" */ any /* ERROR "predeclared any requires go1.18 or later" */] struct{}
// for init (and main, but we're not in package main) we should only get one error
func init[P /* ERROR "func init must have no type parameters" */ any /* ERROR "predeclared any requires go1.18 or later" */]() {
}
func main[P /* ERROR "type parameter requires go1.18 or later" */ any /* ERROR "predeclared any requires go1.18 or later" */]() {
}
func f[P /* ERROR "type parameter requires go1.18 or later" */ any /* ERROR "predeclared any requires go1.18 or later" */](x P) {
var _ T[ /* ERROR "type instantiation requires go1.18 or later" */ int]
var _ (T[ /* ERROR "type instantiation requires go1.18 or later" */ int])
_ = T[ /* ERROR "type instantiation requires go1.18 or later" */ int]{}
_ = T[ /* ERROR "type instantiation requires go1.18 or later" */ int](struct{}{})
}
func (T[ /* ERROR "type instantiation requires go1.18 or later" */ P]) g(x int) {
f[ /* ERROR "function instantiation requires go1.18 or later" */ int](0) // explicit instantiation
(f[ /* ERROR "function instantiation requires go1.18 or later" */ int])(0) // parentheses (different code path)
f( /* ERROR "implicit function instantiation requires go1.18 or later" */ x) // implicit instantiation
}
type C1 interface {
comparable // ERROR "predeclared comparable requires go1.18 or later"
}
type C2 interface {
comparable // ERROR "predeclared comparable requires go1.18 or later"
int // ERROR "embedding non-interface type int requires go1.18 or later"
~ /* ERROR "embedding interface element ~int requires go1.18 or later" */ int
int /* ERROR "embedding interface element int | ~string requires go1.18 or later" */ | ~string
}
type _ interface {
// errors for these were reported with their declaration
C1
C2
}
type (
_ comparable // ERROR "predeclared comparable requires go1.18 or later"
// errors for these were reported with their declaration
_ C1
_ C2
_ = comparable // ERROR "predeclared comparable requires go1.18 or later"
// errors for these were reported with their declaration
_ = C1
_ = C2
)