%start Scanners
%comment "Formatting test"
%line_comment "#"
%line_comment '//'
%block_comment '/*' '*/'
%user_type UserType1 = UserDefinedTypeName1
%user_type UserType2 = UserDefinedTypeName2
%scanner Esc { %auto_newline_off %auto_ws_off %line_comment '//' %block_comment '/*' '*/' }
%%
Scanners: <INITIAL, Esc>"xxx";