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go/types, types2: better error message for invalid use of constraint type

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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>
This commit is contained in:
Robert Griesemer 2022-06-07 13:39:56 -07:00
parent 269bf7e855
commit 3507805bcd
4 changed files with 36 additions and 4 deletions
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16
src/cmd/compile/internal/types2/testdata/fixedbugs/issue42881.go vendored Normal file
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@ -0,0 +1,16 @@
// Copyright 2022 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.
package p
type (
T1 interface{ comparable }
T2 interface{ int }
)
var (
_ comparable // ERROR cannot use type comparable outside a type constraint: interface is \(or embeds\) comparable
_ T1 // ERROR cannot use type T1 outside a type constraint: interface is \(or embeds\) comparable
_ T2 // ERROR cannot use type T2 outside a type constraint: interface contains type constraints
)

4
src/cmd/compile/internal/types2/typexpr.go
View file

@ -167,9 +167,9 @@ func (check *Checker) validVarType(e syntax.Expr, typ Type) {
tset := computeInterfaceTypeSet(check, pos, t) // TODO(gri) is this the correct position?
if !tset.IsMethodSet() {
if tset.comparable {
check.softErrorf(pos, "interface is (or embeds) comparable")
check.softErrorf(pos, "cannot use type %s outside a type constraint: interface is (or embeds) comparable", typ)
} else {
check.softErrorf(pos, "interface contains type constraints")
check.softErrorf(pos, "cannot use type %s outside a type constraint: interface contains type constraints", typ)
}
}
}

16
src/go/types/testdata/fixedbugs/issue42881.go vendored Normal file
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@ -0,0 +1,16 @@
// Copyright 2022 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.
package p
type (
T1 interface{ comparable }
T2 interface{ int }
)
var (
_ comparable // ERROR cannot use type comparable outside a type constraint: interface is \(or embeds\) comparable
_ T1 // ERROR cannot use type T1 outside a type constraint: interface is \(or embeds\) comparable
_ T2 // ERROR cannot use type T2 outside a type constraint: interface contains type constraints
)

4
src/go/types/typexpr.go
View file

@ -163,9 +163,9 @@ func (check *Checker) validVarType(e ast.Expr, typ Type) {
tset := computeInterfaceTypeSet(check, e.Pos(), t) // TODO(gri) is this the correct position?
if !tset.IsMethodSet() {
if tset.comparable {
check.softErrorf(e, _MisplacedConstraintIface, "interface is (or embeds) comparable")
check.softErrorf(e, _MisplacedConstraintIface, "cannot use type %s outside a type constraint: interface is (or embeds) comparable", typ)
} else {
check.softErrorf(e, _MisplacedConstraintIface, "interface contains type constraints")
check.softErrorf(e, _MisplacedConstraintIface, "cannot use type %s outside a type constraint: interface contains type constraints", typ)
}
}
}