parse
Types
pub type Day =
Int
Functions
pub fn day(s: String) -> Result(Int, Snag)
pub fn days(l: List(String)) -> Result(List(Int), Snag)
pub fn int(s: String) -> Result(Int, Snag)
pub fn valid_int(s: String, is_valid: fn(Int) -> Bool, invalid_msg: String) -> Result(
Int,
Snag,
)