61 lines
1.3 KiB
Rust
61 lines
1.3 KiB
Rust
//@ run-pass
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#![allow(dead_code)]
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pub fn main() {
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let x = Some(3);
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if let Some(y) = x {
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assert_eq!(y, 3);
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} else {
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panic!("`if let` panicked");
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}
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let mut worked = false;
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if let Some(_) = x {
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worked = true;
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}
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assert!(worked);
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let clause: usize;
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if let None = Some("test") {
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clause = 1;
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} else if 4_usize > 5 {
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clause = 2;
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} else if let Ok(()) = Err::<(),&'static str>("test") {
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clause = 3;
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} else {
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clause = 4;
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}
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assert_eq!(clause, 4_usize);
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if 3 > 4 {
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panic!("bad math");
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} else if let 1 = 2 {
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panic!("bad pattern match");
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}
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enum Foo {
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One,
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Two(usize),
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Three(String, isize)
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}
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let foo = Foo::Three("three".to_string(), 42);
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if let Foo::One = foo {
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panic!("bad pattern match");
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} else if let Foo::Two(_x) = foo {
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panic!("bad pattern match");
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} else if let Foo::Three(s, _) = foo {
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assert_eq!(s, "three");
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} else {
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panic!("bad else");
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}
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if false {
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panic!("wat");
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} else if let a@Foo::Two(_) = Foo::Two(42_usize) {
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if let Foo::Two(b) = a {
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assert_eq!(b, 42_usize);
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} else {
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panic!("panic in nested `if let`");
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}
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}
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}
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