Here's my guess.

You have this: 

expression:
operand operator expression  { [@item[1..3]] } |

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This way, 3%2*4 can not be parsed as (3%2)*4 because according to the grammar, the left side of the operator must be an operand. 3%2 is not an operand, because it's not explicitly parenthisized.

In reply to Re: Order of Precedence in Parse::RecDescent grammar by ambrus
in thread Order of Precedence in Parse::RecDescent grammar by suaveant

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