cmd/compile: invalid memory address or nil pointer dereference

[elagergren-spideroak]

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

$ go version
go version go1.16 darwin/amd64

Does this issue reproduce with the latest release?

Yep.

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN="/Users/$USER/gopath/bin"
GOCACHE="/Users/$USER/Library/Caches/go-build"
GOENV="/Users/$USER/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/$USER/gopath/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/$USer/gopath"
GOPRIVATE=""
GOPROXY="$PROXY"
GOROOT="/usr/local/go"
GOSUMDB="$SUMDB"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/2b/74fz3jhd4wz4vnbf4z7ywzww0000gp/T/go-build2406540359=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

https://play.golang.org/p/vhFwohxt9c3

What did you expect to see?

Anything other than an ICE.

What did you see instead?

An ICE.

[randall77]

I believe this is fixed at tip.

% ../bin/go build ~/gowork/issue45044.go      
# command-line-arguments
../../../gowork/issue45044.go:8:6: invalid recursive type chain
	/Users/khr/gowork/issue45044.go:8:6: chain refers to
	/Users/khr/gowork/issue45044.go:8:6: chain

[elagergren-spideroak]

Yep. Thanks @randall77.

$ gotip run x.go
# command-line-arguments
./x.go:8:6: invalid recursive type chain
	/tmp/x.go:8:6: chain refers to
	/tmp/x.go:8:6: chain