message: verilog preproc: allow ` in escaped ids
diff: @@ -252,7 +252,8 @@ mode PRAGMA_MODE;
  mode DEFAULT_MODE;
  - CODE: (~('`' | '\n' | '/' | '"')
  + CODE: (~('`' | '\n' | '/' | '"' | '\\')
  + | '\\' (~[ \t\n])+
  | ( '/' ~('/' | '*') )
  | '`' '`'
  | '`' '"'
  