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cmd/compile: internal compiler error: dictionary variable not captured by value #60569

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believening opened this issue Jun 2, 2023 · 3 comments
Closed

cmd/compile: internal compiler error: dictionary variable not captured by value #60569

believening opened this issue Jun 2, 2023 · 3 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@believening
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What version of Go are you using (go version)?

$ go version
go version go1.19.9 linux/amd64

Does this issue reproduce with the latest release?

worked in 1.20

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

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/xxx/.cache/go-build"
GOENV="/home/xxx/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/xxx/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/xxx/go"
GOPRIVATE=""
GOPROXY=""
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19.9"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
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 -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1259709727=/tmp/go-build -gno-record-gcc-switches"

What did you do?

A simplified version of our actual code compiles successfully in 1.20, but not in 1.19.

https://go.dev/play/p/-rFoI3jndSq?v=goprev

What did you expect to see?

build successfully

What did you see instead?

build failed

internal compiler error: dictionary variable not captured by value

Please file a bug report including a short program that triggers the error.
https://go.dev/issue/new
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Jun 2, 2023
@mknyszek mknyszek added this to the Backlog milestone Jun 2, 2023
@mknyszek
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mknyszek commented Jun 2, 2023

CC @mdempsky @griesemer

@mknyszek
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mknyszek commented Jun 2, 2023

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 Jun 2, 2023
@mdempsky
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mdempsky commented Jun 2, 2023

Go 1.20 uses a completely different implementation of generics than Go 1.19 did. Backporting a fix for this to Go 1.19 is impractical, sorry.

@mdempsky mdempsky closed this as completed Jun 2, 2023
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@mdempsky @mknyszek @gopherbot @believening