cmd/doc: -all constraints: unexpected type for embedded field

[frioux]

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

$ go version
go version go1.18beta1 linux/amd64

Does this issue reproduce with the latest release?

Sure

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/frew/.cache/go-build"
GOENV="/home/frew/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS="-mod=readonly"
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/frew/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/frew/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org"
GOROOT="/home/frew/sdk/go1.18beta1"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/frew/sdk/go1.18beta1/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.18beta1"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/frew/code/leatherman/go.mod"
GOWORK=""
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=/run/shm/go-build764406924=/tmp/go-build -gno-record-gcc-switches"

What did you do?

$ go1.18beta1 doc -all constraints

What did you expect to see?

Docs without errors

What did you see instead?

The following errors in front of the doc:

doc: invalid program: unexpected type for embedded field
doc: invalid program: unexpected type for embedded field
doc: invalid program: unexpected type for embedded field
doc: invalid program: unexpected type for embedded field
doc: invalid program: unexpected type for embedded field
doc: invalid program: unexpected type for embedded field
package constraints // import "constraints"

Package constraints defines a set of useful constraints to be used with type
parameters.

TYPES

type Complex interface {
        ~complex64 | ~complex128
}
    Complex is a constraint that permits any complex numeric type. If future
    releases of Go add new predeclared complex numeric types, this constraint
    will be modified to include them.

type Float interface {
        ~float32 | ~float64
...

My guess is that doc doesn't use the newer parser options or something?

[gopherbot]

Change https://golang.org/cl/373314 mentions this issue: cmd/doc: don't log on constraint type elements