cmd/compile: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference

[jmacd]

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

Installed the binary from https://go.dev/doc/install today:

$ go version
go version go1.19 darwin/amd64

Does this issue reproduce with the latest release?

Yes. Here is a play link:
https://go.dev/play/p/R_wq9G9RIFV
That pulls in https://github.com/lightstep/otel-launcher-go/tree/main/lightstep/sdk/metric/aggregator/minmaxsumcount, which compiles in 1.18 but not in 1.19

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/josh.macdonald/Library/Caches/go-build"
GOENV="/Users/josh.macdonald/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/josh.macdonald/src/lightstep/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/josh.macdonald/src/lightstep/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.19"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/josh.macdonald/src/opentelemetry/otel-launcher-go/lightstep/sdk/metric/go.mod"
GOWORK="/Users/josh.macdonald/src/opentelemetry/otel-launcher-go/go.work"
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/hp/8_6w4qns7g79tww_56kst5nh0000gp/T/go-build4007331615=/tmp/go-build -gno-record-gcc-switches -fno-common"

This may be a duplicate of #54243

What did you expect to see?

In 1.18 this package compiles.

What did you see instead?

In 1.19, the error message:

# github.com/lightstep/otel-launcher-go/lightstep/sdk/metric/aggregator/minmaxsumcount
<autogenerated>:1: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference

Please file a bug report including a short program that triggers the error.
https://go.dev/issue/new

[seankhliao]

cc @golang/compiler

[mdempsky]

Minimized repro:

package p

func A() {
	B[int](nil)
}

func B[T any](iface interface{ M() }) {
	_ = iface.(*G[T])
}

type G[_ any] struct{}

func (*G[_]) M() {}

[mdempsky]

@gopherbot Please backport to Go 1.19. This is a regression from Go 1.18.

[gopherbot]

Backport issue(s) opened: #54308 (for 1.18), #54309 (for 1.19).

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

[gopherbot]

Change https://go.dev/cl/421755 mentions this issue: cmd/compile: fix import/export of ODYNAMICDOTTYPE