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cmd/compile: struct literals with dot-imported key identifiers mishandled #43164

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mdempsky opened this issue Dec 13, 2020 · 2 comments
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cmd/compile: struct literals with dot-imported key identifiers mishandled #43164

mdempsky opened this issue Dec 13, 2020 · 2 comments
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@mdempsky mdempsky commented Dec 13, 2020

In type-check, we have code that tries to recognize when a bare identifier was rewritten due to a dot-imported package, but it fails when the same symbol is dot-imported as two different in packages in separate compilation units.

This program should compile successfully, and is accepted by go/types and gccgo, but not cmd/compile: https://play.golang.org/p/to-v3A3bFt-

@mdempsky mdempsky added this to the Go1.17 milestone Dec 13, 2020
@mdempsky mdempsky self-assigned this Dec 13, 2020
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@gopherbot gopherbot commented Dec 14, 2020

Change https://golang.org/cl/277713 mentions this issue: [dev.regabi] cmd/compile: use ir.Ident for imported identifiers

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gopherbot pushed a commit that referenced this issue Dec 15, 2020
This CL substantially reworks how imported declarations are handled,
and fixes a number of issues with dot imports. In particular:

1. It eliminates the stub ir.Name declarations that are created
upfront during import-declaration processing, allowing this to be
deferred to when the declarations are actually needed. (Eventually,
this can be deferred even further so we never have to create ir.Names
w/ ONONAME, but this CL is already invasive/subtle enough.)

2. During noding, we now use ir.Idents to represent uses of imported
declarations, including of dot-imported declarations.

3. Unused dot imports are now reported after type checking, so that we
can correctly distinguish whether composite literal keys are a simple
identifier (struct literals) or expressions (array/slice/map literals)
and whether it might be a use of a dot-imported declaration.

4. It changes the "redeclared" error messages to report the previous
position information in the same style as other compiler error
messages that reference other source lines.

Passes buildall w/ toolstash -cmp.

Fixes #6428.
Fixes #43164.
Fixes #43167.
Updates #42990.

Change-Id: I40a0a780ec40daf5700fbc3cfeeb7300e1055981
Reviewed-on: https://go-review.googlesource.com/c/go/+/277713
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
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@mdempsky mdempsky commented Jan 18, 2021

Fixed on dev.regabi.

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@mdempsky mdempsky closed this Jan 18, 2021
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