Rational.Rational.mul: def of bend-kit-bignum@0.1.0.0
Import: import bend-kit-bignum@0.1.0.0/rational.bend as Rational
Lines 65-68 of bend-kit-bignum@0.1.0.0/rational.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-bignum@0.1.0.0/rational.bend&start_line=65&end_line=68

import Base
import bend-kit-bignum@0.1.0.0/bigint.bend as Big

def Rational.mul(a: Rational, b: Rational) -> Rational:
  match a b:
    case Rational{an, ad} Rational{bn, bd}:
      Rational.norm(Big.BigInt.mul(an, bn), Big.BigInt.mul(ad, bd))

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bignum@0.1.0.0/bigint.bend&name=BigInt.mul
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bignum@0.1.0.0/rational.bend&name=Rational
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bignum@0.1.0.0/rational.bend&name=Rational.norm