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go/test/fixedbugs/issue43762.go
Cuong Manh Le b14fd720a8 [dev.typeparams] cmd/compile: make types2 report better error for invalid untyped operation
This ports the fix in CL 328050 for typecheck to types2.

The fix is not identical, due to code structure differences between
typecheck and types2, but the idea is the same. We only do the untyped
conversion when both operands can be mixed.

Updates #46749

Change-Id: Ib2c63ba0d5dd8bf02318b1bfdfe51dcaeeeb7f82
Reviewed-on: https://go-review.googlesource.com/c/go/+/328053
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
2021-06-17 02:30:22 +00:00

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Go

// errorcheck
// 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.
package p
var _ = true == '\\' // ERROR "invalid operation: (cannot compare true)|(true) == '\\\\' \(mismatched types untyped bool and untyped rune\)"
var _ = true == '\'' // ERROR "invalid operation: (cannot compare true)|(true) == '\\'' \(mismatched types untyped bool and untyped rune\)"
var _ = true == '\n' // ERROR "invalid operation: (cannot compare true)|(true) == '\\n' \(mismatched types untyped bool and untyped rune\)"