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Commit f1fe5b4a authored by Simon Peyton Jones's avatar Simon Peyton Jones
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Fix scoping of pattern-synonym existentials 

This patch fixes Trac #14998, where we eventually decided that
the existential type variables of the signature of a pattern
synonym should not scope over the pattern synonym.

See Note [Pattern synonym existentials do not scope] in TcPatSyn.
parent 1e64fc81
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