Errors talking about a left section should refer to the "first" argument

rather than the "second" argument. Fixes trac #3505.

diff --git a/compiler/typecheck/TcExpr.lhs b/compiler/typecheck/TcExpr.lhs
index 4ccd89c..98942a4 100644 (file)
--- a/compiler/typecheck/TcExpr.lhs
+++ b/compiler/typecheck/TcExpr.lhs
@@ -261,7 +261,7 @@ tcExpr in_expr@(SectionL arg1 lop@(L loc op)) res_ty
                <+> ptext (sLit "takes one argument")
     tc_args arg2_ty' qtvs qtys [arg1_ty, arg2_ty] 
        = do { boxyUnify arg2_ty' (substTyWith qtvs qtys arg2_ty)
-            ; arg1' <- tcArg lop 2 arg1 qtvs qtys arg1_ty 
+            ; arg1' <- tcArg lop 1 arg1 qtvs qtys arg1_ty
             ; qtys' <- mapM refineBox qtys     -- c.f. tcArgs 
             ; return (qtys', arg1') }
     tc_args _ _ _ _ = panic "tcExpr SectionL"