[backport] Allow case in pattern bindings even without -Xsource:3
#9740
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lrytz
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In scala#9558 (which shipped with 2.13.6) we added support for `case` bindings under -Xsource:3. Since this parser change does not break any existing code and since IntelliJ and scalameta/metals now understand this syntax in Scala 2 code, it should be safe to enable it by default to further ease cross-compilation between Scala 2 and 3.
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This backports #9721 to Scala 2.12.