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cmd/compile: internal compiler error: want STRUCT, but have PTR #48056

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korzhao opened this issue Aug 30, 2021 · 1 comment
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cmd/compile: internal compiler error: want STRUCT, but have PTR #48056

korzhao opened this issue Aug 30, 2021 · 1 comment
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@korzhao
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korzhao commented Aug 30, 2021 •
edited

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

$ go version
go tip go1.18-a16ac45570

Does this issue reproduce with the latest release?

Yes

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

go env Output
$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/kezhao/Library/Caches/go-build"
GOENV="/Users/kezhao/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/kezhao/go/pkg/mod"
GONOPROXY="git.code.oa.com,git.woa.com"
GONOSUMDB="git.code.oa.com,git.woa.com"
GOOS="darwin"
GOPATH="/Users/kezhao/go"
GOPRIVATE="git.code.oa.com,git.woa.com"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/kezhao/google/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/kezhao/google/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="devel go1.18-56c3856d52 Mon Aug 30 02:40:46 2021 +0000"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/kezhao/go/src/apnstest/go.mod"
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/2g/yv3ln7wj5vbdtwfj0js10krh0000gn/T/go-build3452127800=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

package main

type B[T any] interface {
	Work()
}
type BImpl[T any] struct{}
func (b *BImpl[T]) Work() {
}

type A[T any] struct {
	B[T]
}
func f[T any]() {
	s := &A[T]{
		&BImpl[T]{},
	}
	s.Work()
}
func main() {
	f[string]()
}

What did you expect to see?

no error

What did you see instead?

./main.go:17:2: internal compiler error: want STRUCT, but have *A[main.T₅]

goroutine 1 [running]:
runtime/debug.Stack()
	/Users/kezhao/google/go/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0x1a51330, 0x0}, {0x18fb511, 0x14}, {0xc00081ea48, 0x2, 0x2})
	/Users/kezhao/google/go/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
	/Users/kezhao/google/go/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/types.(*Type).wantEtype(...)
	/Users/kezhao/google/go/src/cmd/compile/internal/types/type.go:925
cmd/compile/internal/types.(*Type).Fields(0xc0008cea10)
	/Users/kezhao/google/go/src/cmd/compile/internal/types/type.go:1040 +0x86
cmd/compile/internal/types.(*Type).Field(...)
	/Users/kezhao/google/go/src/cmd/compile/internal/types/type.go:1046
cmd/compile/internal/noder.(*irgen).selectorExpr(0xc00069ae00, {0x586a80, 0xc0}, {0x1a51380, 0xc000539880}, 0xc000373350)
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/expr.go:275 +0x1285
cmd/compile/internal/noder.(*irgen).expr0(0xc00069ae00, {0x1a51380, 0xc000539880}, {0x1a524c8, 0xc000373350})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/expr.go:197 +0x75b
cmd/compile/internal/noder.(*irgen).expr(0xc00069ae00, {0x1a524c8, 0xc000373350})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/expr.go:80 +0x610
cmd/compile/internal/noder.(*irgen).expr0(0xc00069ae00, {0x1a513f8, 0x0}, {0x1a51fe8, 0xc0000bfa00})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/expr.go:115 +0x166
cmd/compile/internal/noder.(*irgen).expr(0xc00069ae00, {0x1a51fe8, 0xc0000bfa00})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/expr.go:80 +0x610
cmd/compile/internal/noder.(*irgen).stmt(0xc00069ae00, {0x1a52168, 0xc00037bfe0})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/stmt.go:40 +0x875
cmd/compile/internal/noder.(*irgen).stmts(0xc00085f730, {0xc0003ce000, 0x2, 0x27a53f0})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/stmt.go:19 +0xaf
cmd/compile/internal/noder.(*irgen).funcBody(0xc00069ae00, 0xc000855e40, 0xc000883a88, 0xc0000bf8c0, 0xc0000bf900)
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/func.go:45 +0x25f
cmd/compile/internal/noder.(*irgen).funcDecl.func1()
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/decl.go:124 +0x68
cmd/compile/internal/noder.(*irgen).generate(0xc00069ae00, {0xc000372ea0, 0x6, 0x0})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/irgen.go:265 +0x18b
cmd/compile/internal/noder.check2({0xc000372ea0, 0x6, 0x6})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/irgen.go:92 +0x177
cmd/compile/internal/noder.LoadPackage({0xc0000c4110, 0x6, 0x50})
	/Users/kezhao/google/go/src/cmd/compile/internal/noder/noder.go:90 +0x335
cmd/compile/internal/gc.Main(0x191e230)
	/Users/kezhao/google/go/src/cmd/compile/internal/gc/main.go:190 +0xaf3
main.main()
	/Users/kezhao/google/go/src/cmd/compile/main.go:55 +0xdd
@gopherbot
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Change https://golang.org/cl/346049 mentions this issue: cmd/compile: fix error when revcType is ptr in selectorExpr

@korzhao korzhao changed the title cmd/compile: internal compiler error: want STRUCT, but have *A cmd/compile: internal compiler error: want STRUCT, but have PTR Aug 30, 2021
@golang golang locked and limited conversation to collaborators Aug 30, 2022
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