This worked in Go 1.10 but was broken in Go 1.11.

cmd/compile succeeds but cmd/link fails. Not sure whether cmd/compile output garbage, though.

bradfitz@gdev:~$ cat > x.go
package main

import (
        "fmt"
        "reflect"
)

func main() {
        fmt.Println(reflect.TypeOf(error.Error))
}


bradfitz@gdev:~$ GOROOT=$HOME/go1.10 go run x.go
func(error) string

bradfitz@gdev:~$ GOROOT=$HOME/go1.11 go run x.go
# command-line-arguments
go.builtin.error.Error·f: relocation target go.builtin.error.Error not defined

bradfitz@gdev:~$ go run x.go
# command-line-arguments
go.builtin.error.Error·f: relocation target go.builtin.error.Error not defined

/cc @griesemer @mdempsky @josharian @cherrymui @heschik @ianlancetaylor

Probably warrants a backport too.

git bisect points to 80bbad0 (cmd/compile: omit unnecessary interface method expression wrappers).

Simpler reproducer:

package main

func main() {
	_ = error.Error(nil)
}

Change https://golang.org/cl/154578 mentions this issue: cmd/compile: generate interface method expression wrapper for error.Error

@gopherbot, please backport to Go 1.11.

Backport issue(s) opened: #29307 (for 1.11).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://golang.org/wiki/MinorReleases.