affected/package: cmd/compile

[ddaa2000]

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

$ go version
go version go1.18.1 windows/amd64

Does this issue reproduce with the latest release?

yes, and older versions too.

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

go env Output

$ go env
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=      
set GOCACHE=C:\Users\ddaa\AppData\Local\go-build
set GOENV=C:\Users\ddaa\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\ddaa\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\ddaa\go
set GOPRIVATE=
set GOPROXY=https://goproxy.cn,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.18.1
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=D:\programing\go\bugReview\go.mod
set GOWORK=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\ddaa\AppData\Local\Temp\go-build2565525896=/tmp/go-build -gno-rec
ord-gcc-switches

What did you do?

https://go.dev/play/p/B174Ew_9WL8

What did you expect to see?

The compiler should treat switch on nameless struct constant expression and named struct type constant equally, or the documentation should explain that using named type constant is not allowed.

What did you see instead?

The program caused a compilation error while It seems that I am unable to find rules in the language specification saying this is not allowed.

[seankhliao]

there are syntax errors and parsing ambiguities in your code https://go.dev/play/p/hcprB6e912_w

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