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cmd/compile: don't emit conversion error in non-numeric increment/decrement
In increment and decrement statements, explicit check that the type of operand is numeric earlier. This avoids a related but less clear error about converting "1" to be emitted. So, when compiling package main func main() { var x bool x++ } instead of emitting two errors prog.go:5: cannot convert 1 to type bool prog.go:5: invalid operation: x++ (non-numeric type bool) just emits the second error. Fixes #12525. Change-Id: I6e81330703765bef0d6eb6c57098c1336af7c799 Reviewed-on: https://go-review.googlesource.com/20245 Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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@ -521,6 +521,11 @@ OpSwitch:
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n.Type = nil
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return
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}
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if n.Implicit && !okforarith[l.Type.Etype] {
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Yyerror("invalid operation: %v (non-numeric type %v)", n, l.Type)
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n.Type = nil
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return
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}
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// TODO(marvin): Fix Node.EType type union.
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op = Op(n.Etype)
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} else {
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@ -632,12 +637,6 @@ OpSwitch:
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if t.Etype != TIDEAL && !Eqtype(l.Type, r.Type) {
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defaultlit2(&l, &r, true)
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if n.Op == OASOP && n.Implicit {
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Yyerror("invalid operation: %v (non-numeric type %v)", n, l.Type)
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n.Type = nil
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return
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}
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if Isinter(r.Type) == Isinter(l.Type) || aop == 0 {
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Yyerror("invalid operation: %v (mismatched types %v and %v)", n, l.Type, r.Type)
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n.Type = nil
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26
test/fixedbugs/issue12525.go
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26
test/fixedbugs/issue12525.go
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@ -0,0 +1,26 @@
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// errorcheck
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// Copyright 2016 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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// Issue 12525: confusing error trying to increment boolean value
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package main
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func main() {
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var i int
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i++
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var f float64
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f++
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var c complex128
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c++
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var b bool
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b++ // ERROR "invalid operation: b\+\+ \(non-numeric type bool\)"
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var s string
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s-- // ERROR "invalid operation: s-- \(non-numeric type string\)"
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}
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