encoding/json: Marshaling embedded structures which supports custom json.Marshaler interface

[kirill-a-belov]

What version of Go are you using (go version)?

$ go version
go version go1.10.3 linux/amd64

Does this issue reproduce with the latest release?

Didn't try.

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

go env Output

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/kirill/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/kirill/go"
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
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-build489275390=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Try to marshal into json struct which have embended struct with supports custom json.Marshaler interface.
Ex:
struct {
A // Support custom json.Marshaler interface
Field2 string
}

https://play.golang.com/p/wqQV8Mp_11y

What did you expect to see?

All fields of structure.

What did you see instead?

Only fields of embedded structure.