Fix corner case of useless constraint in SPECIALISE pragma

[ghc-hetmet.git] / compiler / typecheck / TcHsSyn.lhs

diff --git a/compiler/typecheck/TcHsSyn.lhs b/compiler/typecheck/TcHsSyn.lhs
index c6d428b..3736184 100644 (file)
--- a/compiler/typecheck/TcHsSyn.lhs
+++ b/compiler/typecheck/TcHsSyn.lhs
@@ -304,11 +304,12 @@ zonk_bind env (AbsBinds { abs_tvs = tyvars, abs_dicts = dicts,
        = zonkIdBndr env global                 `thenM` \ new_global ->
          mapM zonk_prag prags                  `thenM` \ new_prags -> 
          returnM (tyvars, new_global, zonkIdOcc env local, new_prags)
-    zonk_prag prag@(InlinePrag {})  = return prag
-    zonk_prag (SpecPrag expr ty ds inl) = do { expr' <- zonkExpr env expr 
-                                            ; ty'   <- zonkTcTypeToType env ty
-                                            ; let ds' = zonkIdOccs env ds
-                                            ; return (SpecPrag expr' ty' ds' inl) }
+    zonk_prag prag@(L _ (InlinePrag {}))  = return prag
+    zonk_prag (L loc (SpecPrag expr ty ds inl))
+       = do { expr' <- zonkExpr env expr 
+            ; ty'   <- zonkTcTypeToType env ty
+            ; let ds' = zonkIdOccs env ds
+            ; return (L loc (SpecPrag expr' ty' ds' inl)) }
 \end{code}
 
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