Emit mixin-related methods as artifacts, mixin forwarders as bridges #6141
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Mixin forwarders are now emitted unconditionally and without generic signatures, this broke lsp4j and therefore our language server, emitting mixin forwards with the Artifact flag (which remember corresponds to SYNTHETIC in Java bytecode) unbreaks lsp4j, and it seems reasonable to use this for all the forwarders we generate for traits, including super-accessors.
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This seems to match the behavior of Scala 2.13 and more importantly it will be needed after the next commit that emits mixin forwarders as bridges, otherwise `extends App` won't work.
This is the same scheme I proposed in scala/scala#7843 which sidesteps all the issues regarding mixin forwarders and generic signatures, see the discussion in that PR for more information. Tests imported from scalac, some of the comments in them might not be correct for Dotty anymore.
odersky
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hamzaremmal
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Forward port of scala/scala#8037 Reverts #6352 and #6141. Fixes #19270.
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And in the process fix the language server (see #6128)