What version of Go are you using (go version)?
$ go version
go version devel +ffc7bc55f3 Tue Oct 9 10:35:08 2018 +0000 linux/amd64
Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/jaswdr/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/jaswdr"
GOPROXY=""
GORACE=""
GOROOT="/home/jaswdr/go"
GOTMPDIR=""
GOTOOLDIR="/home/jaswdr/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build749620831=/tmp/go-build -gno-record-gcc-switches"
What did you do?
package main
import (
"log"
"bytes"
"encoding/json"
)
type T struct {
Bar string `json:"bar"`
}
func main() {
str := []byte(`{"foo":"bar"}`)
obj := new(T)
dec := json.NewDecoder(bytes.NewReader(str))
dec.DisallowUnknownFields()
err := dec.Decode(&obj)
if err != nil { // Whant to check if the specific unkown fields error happen
log.Fatal(err)
}
log.Println(obj)
}What did you expect to see?
Some way to check if the error happen.
...
if err == json.UnknownFieldsError {
...
}
...What did you see instead?
No way to do this instead of checking the error string
If this is accepted I really want to work on it.
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
What did you expect to see?
Some way to check if the error happen.
What did you see instead?
No way to do this instead of checking the error string
If this is accepted I really want to work on it.