Fixes #24056 Dealias value class types in structural access - #25907
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April 22, 2026 18:21
When a structural refinement member has a type that is a type alias for a generic derived value class, the boxing wrapper in `maybeBoxingCast` synthesized a `New` on the alias, which provided only the alias' partial type arguments to the underlying class constructor and failed with "Not enough type arguments". Dealias the widened type before constructing the `New` so the underlying value class receives its full type argument list. Fixes scala#24056
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When a structural refinement member has a type that is a type alias for a generic derived value class, the boxing wrapper in
maybeBoxingCastsynthesized aNewon the alias, which provided only the alias' partial type arguments to the underlying class constructor and failed with "Not enough type arguments".Dealias the widened type before constructing the
Newso the underlying value class receives its full type argument list.Fixes #24056
How much have you relied on LLM-based tools in this contribution?
Extensively, but this is a single line change.
How was the solution tested?
New automated tests (including the issue's reproducer, if applicable)