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cmd/compile: internal compiler error: missing type [Go 1.18 Beta 2] #51360

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dp-arri opened this issue Feb 25, 2022 · 6 comments
Closed

cmd/compile: internal compiler error: missing type [Go 1.18 Beta 2] #51360

dp-arri opened this issue Feb 25, 2022 · 6 comments
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@dp-arri
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@dp-arri dp-arri commented Feb 25, 2022

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

$ go version
go version go1.18beta2 darwin/amd64

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="amd64"
GOBIN=""
GOCACHE="/Users/puettma/Library/Caches/go-build"
GOENV="/Users/puettma/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/puettma/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/puettma/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/puettma/sdk/go1.18beta2"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/puettma/sdk/go1.18beta2/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.18beta2"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/puettma/dev/experiments/tmp/go18betabug/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 x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/_3/h09lh98n15n211s4zkj8cw258f016f/T/go-build840956101=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

https://go.dev/play/p/u5yZjTiK8aF?v=gotip

What did you expect to see?

./prog.go:6:13: use of builtin cap not in function call

What did you see instead?

./prog.go:6:13: internal compiler error: missing type for &{0xc00038af60 [0xc00038af90] false {{{0xc00038af30 6 13}}}} (*syntax.CallExpr)

@ALTree
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@ALTree ALTree commented Feb 25, 2022

Thanks for reporting this. Tentatively putting it in the 1.18 milestone with no relblocker label since the compiler is crashing on an invalid program.

cc @danscales @griesemer

@ALTree ALTree added this to the Go1.18 milestone Feb 25, 2022
@ALTree ALTree added the NeedsInvestigation label Feb 25, 2022
@mvdan
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@mvdan mvdan commented Feb 25, 2022

This is perhaps stating the obvious, but have you tried with go1.18rc1 or Go master (https://pkg.go.dev/golang.org/dl/gotip)? beta2 is nearly a month old at this point.

@mvdan mvdan added the WaitingForInfo label Feb 25, 2022
@griesemer griesemer self-assigned this Feb 25, 2022
@griesemer griesemer added NeedsFix and removed WaitingForInfo labels Feb 25, 2022
@gopherbot gopherbot removed the NeedsInvestigation label Feb 25, 2022
@griesemer
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@griesemer griesemer commented Feb 25, 2022

@mvdan It fails on the tip playground which is basically up-to-date. So this is definitively a type-checker bug. Must be some trivial oversight given that this just passes. Sigh.

@mvdan
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@mvdan mvdan commented Feb 25, 2022

I hadn't noticed the gotip URL parameter in the playground link, good point :)

@griesemer
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@griesemer griesemer commented Feb 25, 2022

Looks like some error is supressed where it shouldn't.

package p

func _() {
        len.Println()
}

Trace:

testdata/manual.go2:3:6:        -- func _
testdata/manual.go2:3:10:       -- _: func()
testdata/manual.go2:4:20:       -- expr len.Println()
testdata/manual.go2:4:12:       .  -- expr len.Println
testdata/manual.go2:4:9:        .  .  -- expr len
testdata/manual.go2:4:9:        .  .  => len (built-in)
testdata/manual.go2:4:12:       .  => len.Println (invalid operand)
testdata/manual.go2:4:20:       => len.Println() (invalid operand)

@gopherbot
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@gopherbot gopherbot commented Feb 25, 2022

Change https://go.dev/cl/388054 mentions this issue: types2: report an error if built-ins are not called in all cases

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