Backport: When simplifying match types, ensure fully defined before reducing #12068
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Fixes scala#11977 Previously the match types were more often fully defined because inlining at Typer caused more situations where type variables were instantiated. Now that inlining is done later, we need to compensate. I believe it's a good idea anyway since it means we can reduce more match types.
odersky
changed the title
anatoliykmetyuk
approved these changes
Apr 14, 2021
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Backport of #11980