rescript-lang / rescript-lang/rescript

Misleading `this argument will not be used by the function` warning

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Dominant language
OCaml
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Description

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Seems like this warning is wrong, because the argument is used in the output.

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Research direction

Start from the attached reproduction and the compiler warning text; no source file or test is named in the issue. Trace where this warning is produced and how argument usage is determined. Done means the warning is absent when the argument contributes to the generated output, with a regression test covering the reproduction.

Written by the indexing model from the issue text.

Assessment

Tech stack
ocaml
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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