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cmd/compile: generic type cause "internal compiler error: 'main': Value live at entry. It shouldn't be." #56652

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weirenxue opened this issue Nov 8, 2022 · 2 comments
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cmd/compile: generic type cause "internal compiler error: 'main': Value live at entry. It shouldn't be." #56652

weirenxue opened this issue Nov 8, 2022 · 2 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Backlog

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

$ go version
go version go1.19.3 darwin/arm64

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=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/wrxue/Library/Caches/go-build"
GOENV="/Users/wrxue/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/wrxue/.gvm/pkgsets/go1.19.3/global/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/wrxue/.gvm/pkgsets/go1.19.3/global"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/wrxue/.gvm/gos/go1.19.3"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/wrxue/.gvm/gos/go1.19.3/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.19.3"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/wrxue/dev_area/self/go-generic/go.mod"
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/0n/s_bn25kd57n34cn4zfq_45fc0000gn/T/go-build3162168903=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Generic types cause compiler error: https://go.dev/play/p/_j9MRr7EBZG

However, it compiles well without generic types: https://go.dev/play/p/3VMHGTkfDUE

What did you expect to see?

I would like to see the same result for code with generic types as for code without generic types.

What did you see instead?

"internal compiler error: 'main': Value live at entry. It shouldn't be."
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Nov 8, 2022
@mknyszek
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mknyszek commented Nov 8, 2022

CC @golang/compiler

@mknyszek mknyszek added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Nov 8, 2022
@mknyszek mknyszek added this to the Backlog milestone Nov 8, 2022
@mdempsky
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mdempsky commented Nov 8, 2022

This seems like a duplicate of #54911.

Either way, this is fixed on the dev branch due to the switch to GOEXPERIMENT=unified, which is planned for inclusion in Go 1.20. We're unlikely to backport a fix to 1.18/1.19, sorry.

@mdempsky mdempsky closed this as completed Nov 8, 2022
@golang golang locked and limited conversation to collaborators Nov 8, 2023
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@mdempsky @mknyszek @gopherbot @weirenxue