- mapTc tcCoreExpr args `thenTc` \ args' ->
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (emptyLIE, IfaceRuleOut fun' (Rule name vars' args' rhs'))
-
-tcRule (IfaceRuleOut fun rule)
- = tcVar fun `thenTc` \ fun' ->
- returnTc (emptyLIE, IfaceRuleOut fun' rule)
-
-tcRule (HsRule name sig_tvs vars lhs rhs src_loc)
- = tcAddSrcLoc src_loc $
- tcAddErrCtxt (ruleCtxt name) $
- newTyVarTy openTypeKind `thenNF_Tc` \ rule_ty ->
+ mappM tcCoreExpr args `thenM` \ args' ->
+ tcCoreExpr rhs `thenM` \ rhs' ->
+ returnM (IfaceRuleOut fun' (Rule name act vars' args' rhs'))
+
+tcRule (IfaceRuleOut fun rule) -- Built-in rules, and only built-in rules,
+ -- come this way. Usually IfaceRuleOut is only
+ -- used for the *output* of the type checker
+ = tcLookupId fun `thenM` \ fun' ->
+ -- NB: tcLookupId, not tcLookupGlobalId
+ -- Reason: when compiling GHC.Base, where eqString is defined,
+ -- we'll get the builtin rule for eqString, but eqString
+ -- will be in the *local* type environment.
+ -- Seems like a bit of a hack
+ returnM (IfaceRuleOut fun' rule)
+
+tcRule (HsRule name act vars lhs rhs src_loc)
+ = addSrcLoc src_loc $
+ addErrCtxt (ruleCtxt name) $
+ newTyVarTy openTypeKind `thenM` \ rule_ty ->