74 lines
1.5 KiB
Rust
74 lines
1.5 KiB
Rust
#![warn(clippy::wildcard_enum_match_arm)]
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#[derive(Debug)]
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enum Maybe<T> {
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Some(T),
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Probably(T),
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None,
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}
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fn is_it_wildcard<T>(m: Maybe<T>) -> &'static str {
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match m {
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Maybe::Some(_) => "Some",
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_ => "Could be",
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}
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}
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fn is_it_bound<T>(m: Maybe<T>) -> &'static str {
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match m {
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Maybe::None => "None",
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_other => "Could be",
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}
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}
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fn is_it_binding(m: Maybe<u32>) -> String {
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match m {
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Maybe::Some(v) => "Large".to_string(),
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n => format!("{:?}", n),
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}
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}
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fn is_it_binding_exhaustive(m: Maybe<u32>) -> String {
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match m {
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Maybe::Some(v) => "Large".to_string(),
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n @ Maybe::Probably(_) | n @ Maybe::None => format!("{:?}", n),
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}
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}
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fn is_it_with_guard(m: Maybe<u32>) -> &'static str {
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match m {
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Maybe::Some(v) if v > 100 => "Large",
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_ => "Who knows",
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}
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}
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fn is_it_exhaustive<T>(m: Maybe<T>) -> &'static str {
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match m {
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Maybe::None => "None",
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Maybe::Some(_) | Maybe::Probably(..) => "Could be",
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}
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}
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fn is_one_or_three(i: i32) -> bool {
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match i {
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1 | 3 => true,
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_ => false,
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}
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}
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fn main() {
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println!("{}", is_it_wildcard(Maybe::Some("foo")));
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println!("{}", is_it_bound(Maybe::Some("foo")));
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println!("{}", is_it_binding(Maybe::Some(1)));
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println!("{}", is_it_binding_exhaustive(Maybe::Some(1)));
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println!("{}", is_it_with_guard(Maybe::Some(1)));
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println!("{}", is_it_exhaustive(Maybe::Some("foo")));
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println!("{}", is_one_or_three(2));
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}
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