Alex Hoppen e14fa7291f [CS] Don’t fail constraint generation for ErrorExpr or if type fails to resolve ...

Instead of failing constraint generation by returning `nullptr` for an `ErrorExpr` or returning a null type when a type fails to be resolved, return a fresh type variable. This allows the constraint solver to continue further and produce more meaningful diagnostics.

Most importantly, it allows us to produce a solution where previously constraint generation for a syntactic element had failed, which is required to type check multi-statement closures in result builders inside the constraint system.

2022-07-20 09:46:12 +02:00

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