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Simon Peyton Jones authored
The desugarer was generating a redundant box/unbox pair on the LHS of a RULE, which in turn made matching fail. See Note [Simple coercions] in DsBinds.
29cc690e
The desugarer was generating a redundant box/unbox pair on the LHS of a RULE, which in turn made matching fail. See Note [Simple coercions] in DsBinds.