Questions on Nim's grammar

[lyhokia]

I found another problem:
    
    
      #| literal = | INT_LIT | INT8_LIT | INT16_LIT | INT32_LIT | INT64_LIT
      #|           | UINT_LIT | UINT8_LIT | UINT16_LIT | UINT32_LIT | UINT64_LIT
      #|           | FLOAT_LIT | FLOAT32_LIT | FLOAT64_LIT
      #|           | STR_LIT | RSTR_LIT | TRIPLESTR_LIT
      #|           | CHAR_LIT | CUSTOM_NUMERIC_LIT
      #|           | NIL
    
    
    Run

There seems to be an extra "|" in the front of `literal`'s derivation because 
they can't be nil.