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pub fn reduce_or(stack: &mut Vec<Token>) -> Result<Token, RuntimeError> {
// would return Err if the vector were not entirely
// made of Token::Operand(Type::Bool), since we can't reduce with `or`
// other values
let bool_result = unwrap_boolean_tokens(stack);
if let Ok(bool_vec) = bool_result {
Ok(Token::Operand(Type::Bool(
bool_vec.iter().any(|b| *b) // and reducer has "all" here
)))
} else {
Err(RuntimeError{ })
}
}
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