-fwarn-tabs: add "Warning" to the message

diff --git a/compiler/parser/Lexer.x b/compiler/parser/Lexer.x
index 2e17b8f..f31e623 100644 (file)
--- a/compiler/parser/Lexer.x
+++ b/compiler/parser/Lexer.x
@@ -140,7 +140,7 @@ haskell :-
 
 -- everywhere: skip whitespace and comments
 $white_no_nl+                          ;
-$tab+         { warn Opt_WarnTabs (text "Tab character") }
+$tab+         { warn Opt_WarnTabs (text "Warning: Tab character") }
 
 -- Everywhere: deal with nested comments.  We explicitly rule out
 -- pragmas, "{-#", so that we don't accidentally treat them as comments.