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// 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 go1_17
type T[P /* ERROR type parameters require go1\.18 or later */ any] 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]() {}
func main[P /* ERROR type parameters require go1\.18 or later */ any]() {}
func f[P /* ERROR type parameters require go1\.18 or later */ any](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 undeclared name: comparable \(requires version go1\.18 or later\)
}
type C2 interface {
comparable // ERROR undeclared name: comparable \(requires version go1\.18 or later\)
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 undeclared name: comparable \(requires version go1\.18 or later\)
// errors for these were reported with their declaration
_ C1
_ C2
_ = comparable // ERROR undeclared name: comparable \(requires version go1\.18 or later\)
// errors for these were reported with their declaration
_ = C1
_ = C2
)
// TODO(gri) need test cases for imported constraint types (see also issue #47967)
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