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cmd/compile: ICE when a promoted method on an instantiated type implements a type parameter constraint #54348

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mdempsky opened this issue Aug 9, 2022 · 2 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.

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@mdempsky
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mdempsky commented Aug 9, 2022

This program should run successfully: https://go.dev/play/p/bqSPtEGm82w?v=gotip

It worked with Go 1.18 through Go 1.18.3. In Go 1.18.4, it started ICE'ing due to nil pointer dereference in getDictionarySym. It still ICEs in Go 1.18.5 and Go 1.19.

Bisect identifies 93aab18.

Minimized from test case reported by @borzovplus on #54308.

/cc @golang/compiler @cuonglm

@mdempsky mdempsky added the NeedsFix The path to resolution is known, but the work has not been done. label Aug 9, 2022
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Aug 9, 2022
@cuonglm cuonglm self-assigned this Aug 9, 2022
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Change https://go.dev/cl/422274 mentions this issue: cmd/compile: fix ICE when checking implicit dot for method call

@cuonglm
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cuonglm commented Aug 10, 2022

@mdempsky @randall77 Though we agree that there's no backport for generic to go1.18, I think this can be an exception?

At least, I think it's ok to backport this to 1.19, for 1.18, we can revert 93aab18 instead.

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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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