Retain parameter annotations in the generation of mixin phase forwarding methods -- PR choice 1 #24892
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…ding methods
This PR fixes issue scala#22991 by retaining parameter annotations in mixin phase
generation of forwarder methods.
Therefore, a trait method parameter annotated with Java RetentionPolicy.RUNTIME
annotation is retained in the subclasses .class file in same named method/parameter
for Java reflection use.
This restores the behavior of Scala 2 for such RUNTIME annotated paramters.
Closes ticket scala#22991
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Note -- This is one of two PR choices that fix the issue. Consider this one as first cut with simplest set of changes.
Fixes #22991