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go/test/typeparam/issue47631.go
Keith Randall 560dc9712d cmd/compile: error when using internal type declarations in generic functions
We hope to support this feature one day, but it doesn't work currently.
Issue a nice error message instead of having the compiler crash.

Update #47631

Change-Id: I0359411410acbaf9a5b9dbb988cd933de1bb8438
Reviewed-on: https://go-review.googlesource.com/c/go/+/364054
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
2021-11-15 21:21:51 +00:00

35 lines
837 B
Go

// errorcheck -G=3
// 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.
// TODO: one day we will support internal type declarations, at which time this test will be removed.
package p
func g[T any]() {
type U []T // ERROR "type declarations inside generic functions are not currently supported"
type V []int // ERROR "type declarations inside generic functions are not currently supported"
}
type S[T any] struct {
}
func (s S[T]) m() {
type U []T // ERROR "type declarations inside generic functions are not currently supported"
type V []int // ERROR "type declarations inside generic functions are not currently supported"
}
func f() {
type U []int // ok
}
type X struct {
}
func (x X) m() {
type U []int // ok
}