docs: public final void mHexDigit() throws RecognitionException {
          try {
              // src/riemann/Query.g:120:5: ( '0' .. '9' | 'A' .. 'F' | 'a' .. 'f' )
              // src/riemann/Query.g:
              {
              if ( (input.LA(1)>='0' && input.LA(1)<='9')||(input.LA(1)>='A' && input.LA(1)<='F')||(input.LA(1)>='a' && input.LA(1)<='f') ) {
                  input.consume();
  
              }
              else {
                  MismatchedSetException mse = new MismatchedSetException(null,input);
                  recover(mse);
                  throw mse;}
  
  
              }
  
          }
          finally {
          }
      }