bypass constraints for tyFromExpr in generic bodies #23863
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narimiran
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Dec 16, 2024
fixes #19819, fixes #23339 Since #22029 `tyFromExpr` does not match anything in overloading, so generic bodies can know which call expressions to delay until the type can be evaluated. However generic type invocations also run overloading to check for generic constraints even in generic bodies. To prevent them from failing early from the overload not matching, pretend that `tyFromExpr` matches. This mirrors the behavior of the compiler in more basic cases like: ```nim type Foo[T: int] = object x: T Bar[T] = object y: Foo[T] ``` Unfortunately this case doesn't respect the constraint (#21181, some other bugs) but `tyFromExpr` should easily use the same principle when it does. (cherry picked from commit 31ee75f)
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fixes #19819, fixes #23339
Since #22029
tyFromExprdoes not match anything in overloading, so generic bodies can know which call expressions to delay until the type can be evaluated. However generic type invocations also run overloading to check for generic constraints even in generic bodies. To prevent them from failing early from the overload not matching, pretend thattyFromExprmatches. This mirrors the behavior of the compiler in more basic cases like:Unfortunately this case doesn't respect the constraint (#21181, some other bugs) but
tyFromExprshould easily use the same principle when it does.