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Simon Peyton Jones authored
In reviewing Phab:D4968 for Trac #15385 I saw a small but simple refactor to avoid unnecessary work in the desugarer. This patch just arranges to call matchSinglePatVar v ... rather than matchSinglePat (Var v) ... The more specialised function already existed, as match_single_pat_var I also added more comments about decideBangHood
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