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Various fixes for type signatures
a
is actually the same rigid variable inbar
as infoo
.add all symbols from patterns to var_by_symbol. Previously this only happened for identifiers, now we look into records and tags to discover all symbols.
optimize the pattern state
headers
by adding the annotation of a variable when available. So where previously we'd addx => <4>
(symbol points to type variable) we could now addx => Int
directly if there is an annotationx : Int
.