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3d8453e00e
Rather than removing "any" from the universe scope, keep it predeclared but provide a better error message. While at it, remove some unnecessary type assertions. Change-Id: I10603274282ea6afc107f703ab194f32bd334dd1 Reviewed-on: https://go-review.googlesource.com/c/go/+/334911 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
// errorcheck -G
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Basic type parameter list type-checking (not syntax) errors.
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package tparam1
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// The predeclared identifier "any" is only visible as a constraint
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// in a type parameter list.
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var _ any // ERROR "cannot use any outside constraint position"
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func _(_ any) // ERROR "cannot use any outside constraint position"
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type _[_ any /* ok here */ ] struct{}
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const N = 10
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type (
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_[] struct{} // slice
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_[N] struct{} // array
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_[T any] struct{}
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_[T, T any] struct{} // ERROR "T redeclared"
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_[T1, T2 any, T3 any] struct{}
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)
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func _[T any]()
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func _[T, T any]() // ERROR "T redeclared"
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func _[T1, T2 any](x T1) T2
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// Type parameters are visible from opening [ to end of function.
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type C interface{}
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func _[T interface{}]()
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func _[T C]()
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func _[T struct{}]() // ERROR "not an interface"
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func _[T interface{ m() T }]()
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func _[T1 interface{ m() T2 }, T2 interface{ m() T1 }]() {
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var _ T1
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}
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// TODO(gri) expand this
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