Improve processing of first-line comments by LuaParser

grammar/LuaParser.jj

@@ -157,7 +157,6 @@ TOKEN :
 | < #QUOTED: <DECIMAL> | <UNICODE> | <CHAR> >
 | < #DECIMAL:   "\\" ["0"-"9"] (["0"-"9"])? (["0"-"9"])? >
 | < DBCOLON: "::" >
-| < SHEBANG: "#" ["!"," "] (~["\n","\r"])* (<LF>)? >
 | < #UNICODE: "\\" "u" <HEXDIGIT> <HEXDIGIT> <HEXDIGIT> <HEXDIGIT> >
 | < #CHAR: "\\" (~[]) >
 | < #LF: ("\n" | "\r" | "\r\n") >
@@ -169,7 +168,7 @@ Chunk Chunk():
 	Block b;
 }
 {
-	( <SHEBANG> )? b=Block() <EOF> { return new Chunk(b); }
+	( "#" { token_source.SwitchTo(IN_COMMENT); } )? b=Block() <EOF> { return new Chunk(b); }
 }
 
 Block Block():