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reflect: fmt did not invoke Kind.String method on MacOS #20438

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xgz123 opened this issue May 20, 2017 · 2 comments
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reflect: fmt did not invoke Kind.String method on MacOS #20438

xgz123 opened this issue May 20, 2017 · 2 comments
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@xgz123
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xgz123 commented May 20, 2017 •
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What version of Go are you using (go version)?

go version go1.8.1 darwin/amd64

What operating system and processor architecture are you using (go env)?

macOS Sierra

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="***/go"
GORACE=""
GOROOT="***/go"
GOTOOLDIR="***/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/bl/s4qsyy7s6cx4wj6tnhw2mb6w0000gn/T/go-build081416673=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
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?

package main

import (
	"fmt"
	"reflect"
)

type X int

func main() {
	var a X = 100
	t := reflect.TypeOf(a)
	fmt.Println(t.Name(), t.Kind())
}

What did you expect to see?

play.golang.org has the right output:X int

What did you see instead?

my result: X 2
@xgz123 xgz123 changed the title reflect returned wrong kind reflect returned wrong kind on macOS May 20, 2017
@ianlancetaylor ianlancetaylor changed the title reflect returned wrong kind on macOS reflect: fmt did not invoke Kind.String method on MacOS May 20, 2017
@ianlancetaylor
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The problem is not that reflect.Kind returned the wrong value. The problem is that fmt.Println did not invoke the String method of reflect.Kind. The value of Int is in fact 2.

Are you sure that you ran the exact program you show on MacOS? For example, you did not change fmt.Println to simply println?

@xgz123
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xgz123 commented May 21, 2017 •
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@ianlancetaylor ...You are 100% right!

@xgz123 xgz123 closed this as completed May 21, 2017
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@ianlancetaylor @gopherbot @xgz123