Becca Royal-Gordon 627ecbdfff Rip designated types out of the AST ...

Designated types were removed from the constraint solver in #34315, but they are currently still represented in the AST and fully checked. This change removes them as completely as possible without breaking source compatibility (mainly with old swiftinterfaces) or changing the SwiftSyntax tree. Designated types are still parsed, but they are dropped immediately and a warning is diagnosed. During decl checking we also still check if the precedence group is really a designated type, but only so that we can diagnose a warning and fall back to DefaultPrecedence.

This change also fixes an apparent bug in the parser where we did not diagnose operator declarations that contained a `:` followed by a non-identifier token.

2021-08-03 16:13:59 -07:00

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