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cmd/compile: internal compiler error: .dict already has a location #47723

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ALTree opened this issue Aug 16, 2021 · 1 comment
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cmd/compile: internal compiler error: .dict already has a location #47723

ALTree opened this issue Aug 16, 2021 · 1 comment
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@ALTree
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@ALTree ALTree commented Aug 16, 2021

$ gotip version
go version devel go1.18-a0adf91d85 Mon Aug 16 16:58:24 2021 +0000 linux/amd64

A few programs that were crashing the compiler earlier with #47684 now do this, after that got fixed:

package main

func f[_ any]() int {
	var a []int
	_ = func() int {
		return func() int {
			return 0
		}()
	}()
	return a[func() int {
		return 0
	}()]
}

func main() {
	f[int]()
}
$ gotip tool compile -G=3 crash.go

crash.go:16:2: internal compiler error: .dict already has a location

goroutine 1 [running]:
runtime/debug.Stack()
	/home/alberto/go/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0x401d40, 0xc0}, {0xcfa973, 0x19}, {0xc000115760, 0x1, 0x1})
	/home/alberto/go/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
	/home/alberto/go/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/escape.(*escape).newLoc(0xc000115880, {0xe5fe98, 0xc000401d40}, 0x0)
	/home/alberto/go/src/cmd/compile/internal/escape/graph.go:246 +0x54e
...

cc @danscales @randall77

@ALTree ALTree added this to the Go1.18 milestone Aug 16, 2021
@randall77 randall77 self-assigned this Aug 16, 2021
@gopherbot
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@gopherbot gopherbot commented Aug 20, 2021

Change https://golang.org/cl/343871 mentions this issue: cmd/compile: copy captured dictionary var to local var

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@gopherbot gopherbot closed this in 8486ced Aug 23, 2021
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