cmd/compile: internal compiler error: found illegal assignment

[reusee]

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

$ go version
go version devel go1.18-18934e11ba Tue Nov 30 03:39:57 2021 +0000 darwin/arm64

Does this issue reproduce with the latest release?

NO

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

go env Output

$ go env
GO111MODULE=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/reus/Library/Caches/go-build"
GOENV="/Users/reus/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/reus/pkg/mod"
GONOPROXY="github.com/reusee/*"
GONOSUMDB="github.com/reusee/*"
GOOS="darwin"
GOPATH="/Users/reus"
GOPRIVATE="github.com/reusee/*"
GOPROXY="https://goproxy.cn,direct"
GOROOT="/Users/reus/gotip"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/reus/gotip/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="devel go1.18-18934e11ba Tue Nov 30 03:39:57 2021 +0000"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
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 -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/4r/qbq6ljvd4y3c89_zw3yr24v40000gn/T/go-build1913955240=/tmp/go-build -gno-record-gcc-switches -fno-common"
GOROOT/bin/go version: go version devel go1.18-18934e11ba Tue Nov 30 03:39:57 2021 +0000 darwin/arm64
GOROOT/bin/go tool compile -V: compile version devel go1.18-18934e11ba Tue Nov 30 03:39:57 2021 +0000
uname -v: Darwin Kernel Version 21.1.0: Wed Oct 13 17:33:01 PDT 2021; root:xnu-8019.41.5~1/RELEASE_ARM64_T6000
ProductName:	macOS
ProductVersion:	12.0.1
BuildVersion:	21A559
lldb --version: lldb-1300.0.32.4
Swift version 5.5.1-dev

What did you do?

package main

func foo(args ...interface{}) {}

func main() {
	var args []any
	foo(args...)
}

What did you expect to see?

no error

What did you see instead?

./a.go:7:5: internal compiler error: found illegal assignment SLICE-[]any -> SLICE-[]interface {};

goroutine 1 [running]:
runtime/debug.Stack()
	/Users/reus/gotip/src/runtime/debug/stack.go:24 +0x68
cmd/compile/internal/base.FatalfAt({0x0?, 0x0?}, {0x10096ea93, 0x27}, {0x14000142db8, 0x3, 0x3})
	/Users/reus/gotip/src/cmd/compile/internal/base/print.go:227 +0x20c
cmd/compile/internal/base.Fatalf(...)
	/Users/reus/gotip/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/noder.assignconvfn({0x100b928f8, 0x1400058e9c0}, 0x140005904d0)
	/Users/reus/gotip/src/cmd/compile/internal/noder/transform.go:426 +0x154
cmd/compile/internal/noder.typecheckaste(0x90?, {0x1400059c090?, 0x14000142ee8?}, 0x1, 0x1400059c090?, {0x1400037a1d0, 0x1, 0x1008b7518?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/transform.go:483 +0x1e8
cmd/compile/internal/noder.transformCall(0x1400059c090)
	/Users/reus/gotip/src/cmd/compile/internal/noder/transform.go:163 +0x1c0
cmd/compile/internal/noder.Call({0x59a000?, 0x140?}, 0x1400037a050?, {0x100b928f8, 0x1400058e5b0}, {0x1400037a1d0?, 0x1, 0x14000143018?}, 0x1)
	/Users/reus/gotip/src/cmd/compile/internal/noder/helpers.go:186 +0x22c
cmd/compile/internal/noder.(*irgen).expr0(0x1400059a000, {0x100b8e4c0, 0x0}, {0x100b8ed88?, 0x1400058c100?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/expr.go:117 +0x534
cmd/compile/internal/noder.(*irgen).expr(0x1400059a000, {0x100b8ed88?, 0x1400058c100?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/expr.go:81 +0x4f4
cmd/compile/internal/noder.(*irgen).stmt(0x1400059a000, {0x100b8ef08?, 0x1400058a160?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/stmt.go:40 +0xa34
cmd/compile/internal/noder.(*irgen).stmts(0x140005907e0?, {0x1400058a180?, 0x2, 0x0?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/stmt.go:19 +0x9c
cmd/compile/internal/noder.(*irgen).funcBody(0x1400059a000, 0x1400037c420, 0x1400012f640?, 0x1400058c080, 0x1400058c0c0)
	/Users/reus/gotip/src/cmd/compile/internal/noder/func.go:45 +0x224
cmd/compile/internal/noder.(*irgen).funcDecl.func1()
	/Users/reus/gotip/src/cmd/compile/internal/noder/decl.go:143 +0xb8
cmd/compile/internal/noder.(*irgen).generate(0x1400059a000, {0x14000102b00, 0x2, 0x10142cf40?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/irgen.go:280 +0x1f4
cmd/compile/internal/noder.check2({0x14000102b00, 0x2, 0x2})
	/Users/reus/gotip/src/cmd/compile/internal/noder/irgen.go:92 +0x130
cmd/compile/internal/noder.LoadPackage({0x14000132110, 0x2, 0x0?})
	/Users/reus/gotip/src/cmd/compile/internal/noder/noder.go:90 +0x2f0
cmd/compile/internal/gc.Main(0x100b89800)
	/Users/reus/gotip/src/cmd/compile/internal/gc/main.go:191 +0xbe0
main.main()
	/Users/reus/gotip/src/cmd/compile/main.go:55 +0xf8

[ALTree]

cc @danscales

[gopherbot]

Change https://golang.org/cl/367754 mentions this issue: cmd/compile: make irgen emits Types[TINTER] for interface{}