# Leading bar in an or-pattern

match value {
  | 0 | 1 => {}
  _ => {}
}

==>

SourceFile(
  ExpressionStatement(
    MatchExpression(
      match,
      Identifier,
      MatchBlock(
        MatchArm(
          OrPattern(
            OrPattern(LiteralPattern(Integer)),
            LiteralPattern(Integer)),
          Block),
        MatchArm(_, Block)))))