- mapTc tcCoreExpr args `thenTc` \ args' ->
- tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (emptyLIE, IfaceRuleDecl fun' (CoreRuleBody name vars' args' rhs') src_loc)
+ 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)