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cmd/compile: internal compiler error: panic: runtime error: index out of range [0] with length 0 [1.18 backport] #51855

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gopherbot opened this issue Mar 21, 2022 · 3 comments
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cmd/compile: internal compiler error: panic: runtime error: index out of range [0] with length 0 [1.18 backport] #51855

gopherbot opened this issue Mar 21, 2022 · 3 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
Milestone
Go1.18.1

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@gopherbot
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@mdempsky requested issue #51765 to be considered for backport to the next 1.18 minor release.

@gopherbot please backport to Go 1.18; this is a compiler bug that could theoretically lead to silent miscompilation of valid user code
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Mar 21, 2022
@gopherbot gopherbot mentioned this issue Mar 21, 2022
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@gopherbot gopherbot added this to the Go1.18.1 milestone Mar 21, 2022
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Change https://go.dev/cl/394296 mentions this issue: [release-branch.go1.18] cmd/compile: replace Type.OrigSym with Type.OrigType

@toothrot toothrot added the CherryPickApproved Used during the release process for point releases label Mar 23, 2022
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Approved. This is a serious issue with no workaround.

@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Mar 23, 2022
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Closed by merging 78b8b4a to release-branch.go1.18.

gopherbot pushed a commit that referenced this issue Apr 4, 2022
@mdempsky @cherrymui
[release-branch.go1.18] cmd/compile: replace Type.OrigSym with Type.O…
78b8b4a 
…rigType

First law of cmd/compile frontend development: thou shalt not rely on
types.Sym.

This CL replaces Type.OrigSym with Type.OrigType, which semantically
matches what all of the uses within the frontend actually care about,
and avoids using types.Sym, which invariably leads to mistakes because
symbol scoping in the frontend doesn't work how anyone intuitively
expects it to.

Fixes #51855.

Change-Id: I4affe6ee0718103ce5006ab68aa7e1bb0cac6881
Reviewed-on: https://go-review.googlesource.com/c/go/+/394274
Trust: Matthew Dempsky <[email protected]>
Run-TryBot: Matthew Dempsky <[email protected]>
Reviewed-by: Cuong Manh Le <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
(cherry picked from commit adae6ec)
Reviewed-on: https://go-review.googlesource.com/c/go/+/394296
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