Allow the old [$foo| ... |] syntax for quasi-quotes

[ghc-hetmet.git] / compiler / parser / Lexer.x

diff --git a/compiler/parser/Lexer.x b/compiler/parser/Lexer.x
index eab9419..c8a5378 100644 (file)
--- a/compiler/parser/Lexer.x
+++ b/compiler/parser/Lexer.x
@@ -308,6 +308,10 @@ $tab+         { warn Opt_WarnTabs (text "Warning: Tab character") }
   \$ @varid / { ifExtension thEnabled }        { skip_one_varid ITidEscape }
   "$("     / { ifExtension thEnabled } { token ITparenEscape }
 
+-- For backward compatibility, accept the old dollar syntax
+  "[$" @varid "|"  / { ifExtension qqEnabled }
+                     { lex_quasiquote_tok }
+
   "[" @varid "|"  / { ifExtension qqEnabled }
                      { lex_quasiquote_tok }
 }