diff options
| -rw-r--r-- | src/cmd/compile/internal/types2/assignments.go | 2 | ||||
| -rw-r--r-- | src/go/types/assignments.go | 2 | ||||
| -rw-r--r-- | src/internal/types/testdata/fixedbugs/issue3117.go | 13 |
3 files changed, 15 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/types2/assignments.go b/src/cmd/compile/internal/types2/assignments.go index 15d2a89934..cba102e4f4 100644 --- a/src/cmd/compile/internal/types2/assignments.go +++ b/src/cmd/compile/internal/types2/assignments.go @@ -222,7 +222,7 @@ func (check *Checker) lhsVar(lhs syntax.Expr) Type { return Typ[Invalid] } } - check.errorf(&x, UnassignableOperand, "cannot assign to %s", &x) + check.errorf(&x, UnassignableOperand, "cannot assign to %s (neither addressable nor a map index expression)", x.expr) return Typ[Invalid] } diff --git a/src/go/types/assignments.go b/src/go/types/assignments.go index b0d11dfb82..1ea51142e0 100644 --- a/src/go/types/assignments.go +++ b/src/go/types/assignments.go @@ -221,7 +221,7 @@ func (check *Checker) lhsVar(lhs ast.Expr) Type { return Typ[Invalid] } } - check.errorf(&x, UnassignableOperand, "cannot assign to %s", &x) + check.errorf(&x, UnassignableOperand, "cannot assign to %s (neither addressable nor a map index expression)", x.expr) return Typ[Invalid] } diff --git a/src/internal/types/testdata/fixedbugs/issue3117.go b/src/internal/types/testdata/fixedbugs/issue3117.go new file mode 100644 index 0000000000..16c0afce81 --- /dev/null +++ b/src/internal/types/testdata/fixedbugs/issue3117.go @@ -0,0 +1,13 @@ +// Copyright 2023 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 S struct { + a [1]int +} + +func _(m map[int]S, key int) { + m /* ERROR "cannot assign to m[key].a[0] (neither addressable nor a map index expression)" */ [key].a[0] = 0 +} |