#include "HsVersions.h"
-import HsSyn ( RuleDecl(..), RuleBndr(..), HsExpr(..), collectRuleBndrSigTys )
+import HsSyn ( RuleDecl(..), RuleBndr(..), collectRuleBndrSigTys )
import CoreSyn ( CoreRule(..) )
import RnHsSyn ( RenamedRuleDecl )
-import TcHsSyn ( TypecheckedRuleDecl, TcExpr, mkHsLet )
+import TcHsSyn ( TypecheckedRuleDecl, mkHsLet )
import TcRnMonad
import TcSimplify ( tcSimplifyToDicts, tcSimplifyInferCheck )
import TcMType ( newTyVarTy )
-import TcType ( TcTyVarSet, tyVarsOfTypes, tyVarsOfType, openTypeKind )
-import TcIfaceSig ( tcCoreExpr, tcCoreLamBndrs, tcVar )
+import TcUnify ( Expected(..) )
+import TcType ( tyVarsOfTypes, openTypeKind )
+import TcIfaceSig ( tcCoreExpr, tcCoreLamBndrs )
import TcMonoType ( tcHsSigType, UserTypeCtxt(..), tcAddScopedTyVars )
-import TcExpr ( tcMonoExpr )
-import TcEnv ( tcExtendLocalValEnv )
+import TcExpr ( tcCheckRho )
+import TcEnv ( tcExtendLocalValEnv, tcLookupGlobalId, tcLookupId )
import Inst ( instToId )
import Id ( idType, mkLocalId )
-import VarSet
import Outputable
\end{code}
tcRule (IfaceRule name act vars fun args rhs src_loc)
= addSrcLoc src_loc $
addErrCtxt (ruleCtxt name) $
- tcVar fun `thenM` \ fun' ->
+ tcLookupGlobalId fun `thenM` \ fun' ->
tcCoreLamBndrs vars $ \ vars' ->
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 come this way
- = tcVar fun `thenM` \ fun' ->
+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)
tcExtendLocalValEnv ids $
-- Now LHS and RHS
- getLIE (tcMonoExpr lhs rule_ty) `thenM` \ (lhs', lhs_lie) ->
- getLIE (tcMonoExpr rhs rule_ty) `thenM` \ (rhs', rhs_lie) ->
+ getLIE (tcCheckRho lhs rule_ty) `thenM` \ (lhs', lhs_lie) ->
+ getLIE (tcCheckRho rhs rule_ty) `thenM` \ (rhs', rhs_lie) ->
returnM (ids, lhs', rhs', lhs_lie, rhs_lie)
) `thenM` \ (ids, lhs', rhs', lhs_lie, rhs_lie) ->