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Fix signature matching for externals when abstract alias hides function arity#8045

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cknitt merged 1 commit intorescript-lang:masterfrom
cknitt:fix-opaque-externals
Dec 6, 2025
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Fix signature matching for externals when abstract alias hides function arity#8045
cknitt merged 1 commit intorescript-lang:masterfrom
cknitt:fix-opaque-externals

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@cknitt cknitt commented Nov 30, 2025

Fixes #8038

@cknitt cknitt requested a review from cristianoc November 30, 2025 10:08
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cknitt commented Nov 30, 2025

@cristianoc fix by Codex - could you have a look?

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commit: ceedc3c

@cknitt cknitt force-pushed the fix-opaque-externals branch from 36611cd to 3a78abe Compare November 30, 2025 10:16
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cristianoc reviewed Dec 2, 2025
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I think this copied a certain style from existing tests lol.
Opaque test name.

And "regression".
If it is a regression, point out in what compiler version the issue was introduced.

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Just asking to clean up: proper name for the test file, and description in the PR title of what is being fixed.
That said, the question is whether it can be fixed early by trying to avoid to create the issue in the first place.

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cknitt commented Dec 5, 2025 •
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@cristianoc

If it is a regression, point out in what compiler version the issue was introduced.

It worked fine in ReScript 11, but broke in ReScript 12.

proper name for the test file

Can you clarify? I guess the "gpr_<issue_number>" prefix following the conventions from other files is fine?

opaque is not totally wrong as it is about an opaque type in an interface being implemented as a function type in the implementation.
external is not totally wrong either as the problem does not occur without the external declaration.

What would you suggest as the file name / PR title?

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cristianoc commented Dec 5, 2025

@cristianoc

If it is a regression, point out in what compiler version the issue was introduced.

It worked fine in ReScript 11, but broke in ReScript 12.

proper name for the test file

Can you clarify? I guess the "gpr_<issue_number>" prefix following the conventions from other files is fine?

opaque is not totally wrong as it is about an opaque type in an interface being implemented as a function type in the implementation. external is not totally wrong either as the problem does not occur without the external declaration.

What would you suggest as the file name / PR title?

That's some old leftover convention that creates an unnecessary indirection and says nothing about what's tested.

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cristianoc approved these changes Dec 5, 2025
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Ready to go after the suggestions are in.
Still I would ask the agent if this can be prevented earlier instead of fixing just before signature inclusion.

@cknitt cknitt changed the title Fix external signature inclusion for opaque function types Fix signature matching for externals when abstract alias hides function arity Dec 6, 2025
@cknitt cknitt force-pushed the fix-opaque-externals branch from 3a78abe to ceedc3c Compare December 6, 2025 09:41
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cknitt commented Dec 6, 2025

@cristianoc Was not successful in preventing earlier instead of fixing just before signature inclusion.

I did change the naming though, please have another look.

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cristianoc commented Dec 6, 2025

@cristianoc Was not successful in preventing earlier instead of fixing just before signature inclusion.

I did change the naming though, please have another look.

Looks great.
If it's not easy to prevent then not worth sweating it.
The current fix does the job.

@cknitt cknitt merged commit 394848f into rescript-lang:master Dec 6, 2025
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@cknitt cknitt deleted the fix-opaque-externals branch December 6, 2025 10:29
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Signature Mismatch on external using opaque function type in rescript v12

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