; (lhs', lhs_lie, rhs', rhs_lie, rule_ty)
<- tcExtendTyVarEnv tv_bndrs $
tcExtendIdEnv id_bndrs $
- do { ((lhs', rule_ty), lhs_lie) <- getConstraints (tcInferRho lhs)
- ; (rhs', rhs_lie) <- getConstraints (tcMonoExpr rhs rule_ty)
+ do { ((lhs', rule_ty), lhs_lie) <- captureConstraints (tcInferRho lhs)
+ ; (rhs', rhs_lie) <- captureConstraints (tcMonoExpr rhs rule_ty)
; return (lhs', lhs_lie, rhs', rhs_lie, rule_ty) }
; (lhs_dicts, lhs_ev_binds, rhs_ev_binds)