cmd/compile: corrupted value #20530
Description
What version of Go are you using (go version)?
go version go1.8.3 linux/amd64
What operating system and processor architecture are you using (go env)?
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/jnml"
GORACE=""
GOROOT="/home/jnml/go"
GOTOOLDIR="/home/jnml/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build797922225=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
What did you do?
$ cat bug.go
package main
var a uint8
func main() {
b := int8(func() int32 { return -1 }())
a = uint8(b)
//println(a)
if int32(a) != 255 {
println("got", a, "expected 255")
}
}
$ go run bug.go
got 255 expected 255
$
What did you expect to see?
Nothing
What did you see instead?
got 255 expected 255
Additional info
- Uncommenting line 8 (
//println(a)) "fixes" the problem.