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cmd/compile: crashes when trying to export type C comparable #47966

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griesemer opened this issue Aug 25, 2021 · 2 comments
Closed

cmd/compile: crashes when trying to export type C comparable #47966

griesemer opened this issue Aug 25, 2021 · 2 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Go1.18

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@griesemer
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Given

$ cat x.go
package main
type C comparable

we get a crash

$ go tool compile x.go
<autogenerated>:1: internal compiler error: missing pkg

goroutine 1 [running]:
runtime/debug.Stack()
	/Users/gri/goroot/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0x3a1b28, 0xc0}, {0x18ef13b, 0xb}, {0x0, 0x0, 0x0})
	/Users/gri/goroot/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
	/Users/gri/goroot/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/typecheck.(*exportWriter).setPkg(0xc0003a1b20, 0x0, 0x1)
	/Users/gri/goroot/src/cmd/compile/internal/typecheck/iexport.go:1024 +0x55
cmd/compile/internal/typecheck.(*exportWriter).doTyp(0xc0003a1b20, 0xc000366d90)
	/Users/gri/goroot/src/cmd/compile/internal/typecheck/iexport.go:989 +0xb45
cmd/compile/internal/typecheck.(*iexporter).typOff(0xc00032c840, 0xc000366d90)
	/Users/gri/goroot/src/cmd/compile/internal/typecheck/iexport.go:864 +0x88
cmd/compile/internal/typecheck.(*exportWriter).typ(0xc0003a1ab0, 0xc000094654)
	/Users/gri/goroot/src/cmd/compile/internal/typecheck/iexport.go:711 +0x25
cmd/compile/internal/typecheck.(*iexporter).doDecl(0xc00032c840, 0xc0003c5110)
	/Users/gri/goroot/src/cmd/compile/internal/typecheck/iexport.go:569 +0x485
cmd/compile/internal/typecheck.WriteExports({0x1a48660, 0xc0003f02a0}, 0x1)
	/Users/gri/goroot/src/cmd/compile/internal/typecheck/iexport.go:301 +0x2eb
cmd/compile/internal/noder.WriteExports(0xc00008efa0)
	/Users/gri/goroot/src/cmd/compile/internal/noder/export.go:40 +0x7a
cmd/compile/internal/gc.dumpCompilerObj(0xc00008efa0)
	/Users/gri/goroot/src/cmd/compile/internal/gc/obj.go:107 +0x28
cmd/compile/internal/gc.dumpobj1({0xc0000c0df8, 0x3}, 0x3)
	/Users/gri/goroot/src/cmd/compile/internal/gc/obj.go:63 +0x185
cmd/compile/internal/gc.dumpobj()
	/Users/gri/goroot/src/cmd/compile/internal/gc/obj.go:44 +0x36
cmd/compile/internal/gc.Main(0x191b270)
	/Users/gri/goroot/src/cmd/compile/internal/gc/main.go:322 +0x10d6
main.main()
	/Users/gri/goroot/src/cmd/compile/main.go:55 +0xdd
@griesemer griesemer added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Aug 25, 2021
@griesemer griesemer added this to the Go1.18 milestone Aug 25, 2021
@mdempsky
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Works with GOEXPERIMENT=unified.

@gopherbot
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Change https://golang.org/cl/345174 mentions this issue: cmd/compile: support type C comparable

@golang golang locked and limited conversation to collaborators Jun 23, 2023
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@mdempsky @danscales @griesemer @gopherbot