gccgo: reflection-based type printing inconsistency

[tamird]

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

go version go1.10beta2 gccgo (GCC) 8.0.1 20180126 (experimental) linux/amd64

Does this issue reproduce with the latest release?

N/A

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

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/tduberstein/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/tduberstein/local/go"
GORACE=""
GOROOT="/home/tduberstein/local/gcc/gcc"
GOTMPDIR=""
GOTOOLDIR="/home/tduberstein/local/gcc/gcc/libexec/gcc/x86_64-pc-linux-gnu/8.0.1"
GCCGO="/home/tduberstein/local/gcc/gcc/bin/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-build297122770=/tmp/go-build -gno-record-gcc-switches -funwind-tables"

What did you do?

package main

import (
	"fmt"
)

type e = struct{ error }

func main() {
	fmt.Printf("%T\n", e{})
}

https://play.golang.org/p/HRkuS74EjTu

What did you expect to see?

struct { error }

What did you see instead?

struct { ? error }

[gopherbot]

Change https://golang.org/cl/91138 mentions this issue: reflect: add embedded field test

[gopherbot]

Change https://golang.org/cl/91139 mentions this issue: compiler: omit field name for embedded fields in reflection string

[odeke-em]

Thank you @tamird for this bug report.

/cc @paranoiacblack @ianlancetaylor @thanm.