fix a compiler crash with `.varargs` proc types

nim-works / nimskull

An in development statically typed systems programming language; with sustainability at its core. We, the community of users, maintain it.

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Closed zerbina closed 4 months ago

zerbina commented 4 months ago

Fix the compiler crashing when a non-closure proc type with C-style varargs is used somewhere. Only the C backend was affected.

mirtypes.callConv didn't consider the x field storing a boolean value in the most-significant bit, resulting in range defect
the integer value is now properly masked before converting it to a TCallingConvention enum value

saem commented 4 months ago

/merge

github-actions[bot] commented 4 months ago

Merge requested by: @saem

Contents after the first section break of the PR description has been removed and preserved below:

## Notes for Reviewers * this is a case where built-in integers types like `uint1` and `uint31` would be useful