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go/types, types2: better error message for invalid use of constraint type
Fixes #42881. Change-Id: If800c5f90c0034d192bf8b6649e5cfda96df48cb Reviewed-on: https://go-review.googlesource.com/c/go/+/410954 Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com>
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16
src/cmd/compile/internal/types2/testdata/fixedbugs/issue42881.go
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16
src/cmd/compile/internal/types2/testdata/fixedbugs/issue42881.go
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// Copyright 2022 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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package p
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type (
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T1 interface{ comparable }
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T2 interface{ int }
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)
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var (
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_ comparable // ERROR cannot use type comparable outside a type constraint: interface is \(or embeds\) comparable
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_ T1 // ERROR cannot use type T1 outside a type constraint: interface is \(or embeds\) comparable
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_ T2 // ERROR cannot use type T2 outside a type constraint: interface contains type constraints
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)
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@ -167,9 +167,9 @@ func (check *Checker) validVarType(e syntax.Expr, typ Type) {
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tset := computeInterfaceTypeSet(check, pos, t) // TODO(gri) is this the correct position?
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tset := computeInterfaceTypeSet(check, pos, t) // TODO(gri) is this the correct position?
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if !tset.IsMethodSet() {
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if !tset.IsMethodSet() {
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if tset.comparable {
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if tset.comparable {
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check.softErrorf(pos, "interface is (or embeds) comparable")
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check.softErrorf(pos, "cannot use type %s outside a type constraint: interface is (or embeds) comparable", typ)
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} else {
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} else {
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check.softErrorf(pos, "interface contains type constraints")
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check.softErrorf(pos, "cannot use type %s outside a type constraint: interface contains type constraints", typ)
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}
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}
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}
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}
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}
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}
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16
src/go/types/testdata/fixedbugs/issue42881.go
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16
src/go/types/testdata/fixedbugs/issue42881.go
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@ -0,0 +1,16 @@
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// Copyright 2022 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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package p
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type (
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T1 interface{ comparable }
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T2 interface{ int }
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)
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var (
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_ comparable // ERROR cannot use type comparable outside a type constraint: interface is \(or embeds\) comparable
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_ T1 // ERROR cannot use type T1 outside a type constraint: interface is \(or embeds\) comparable
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_ T2 // ERROR cannot use type T2 outside a type constraint: interface contains type constraints
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)
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@ -163,9 +163,9 @@ func (check *Checker) validVarType(e ast.Expr, typ Type) {
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tset := computeInterfaceTypeSet(check, e.Pos(), t) // TODO(gri) is this the correct position?
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tset := computeInterfaceTypeSet(check, e.Pos(), t) // TODO(gri) is this the correct position?
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if !tset.IsMethodSet() {
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if !tset.IsMethodSet() {
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if tset.comparable {
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if tset.comparable {
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check.softErrorf(e, _MisplacedConstraintIface, "interface is (or embeds) comparable")
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check.softErrorf(e, _MisplacedConstraintIface, "cannot use type %s outside a type constraint: interface is (or embeds) comparable", typ)
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} else {
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} else {
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check.softErrorf(e, _MisplacedConstraintIface, "interface contains type constraints")
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check.softErrorf(e, _MisplacedConstraintIface, "cannot use type %s outside a type constraint: interface contains type constraints", typ)
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}
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}
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}
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}
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}
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}
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