32503440cd
Specifically, this allows byte string literal patterns to be used where a `[u8]` or `[u8;N]` is expected when `deref_patterns` is enabled.
66 lines
2 KiB
Rust
66 lines
2 KiB
Rust
//@ run-pass
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//! Test deref patterns using string and bytestring literals.
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#![feature(deref_patterns)]
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#![allow(incomplete_features)]
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fn main() {
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for (test_in, test_expect) in [("zero", 0), ("one", 1), ("two", 2)] {
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// Test string literal patterns having type `str`.
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let test_actual = match *test_in {
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"zero" => 0,
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"one" => 1,
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_ => 2,
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};
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assert_eq!(test_actual, test_expect);
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// Test string literals in explicit `deref!(_)` patterns.
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let test_actual = match test_in.to_string() {
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deref!("zero") => 0,
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deref!("one") => 1,
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_ => 2,
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};
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assert_eq!(test_actual, test_expect);
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}
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// Test that we can still mutate in the match arm after using a literal to test equality:
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let mut test = "test".to_string();
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if let deref!(s @ "test") = &mut test {
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s.make_ascii_uppercase();
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}
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assert_eq!(test, "TEST");
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for (test_in, test_expect) in [(b"0", 0), (b"1", 1), (b"2", 2)] {
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// Test byte string literal patterns having type `[u8; N]`
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let test_actual = match *test_in {
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b"0" => 0,
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b"1" => 1,
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_ => 2,
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};
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assert_eq!(test_actual, test_expect);
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// Test byte string literal patterns having type `[u8]`
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let test_actual = match *(test_in as &[u8]) {
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b"0" => 0,
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b"1" => 1,
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_ => 2,
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};
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assert_eq!(test_actual, test_expect);
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// Test byte string literals used as arrays in explicit `deref!(_)` patterns.
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let test_actual = match Box::new(*test_in) {
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deref!(b"0") => 0,
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deref!(b"1") => 1,
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_ => 2,
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};
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assert_eq!(test_actual, test_expect);
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// Test byte string literals used as slices in explicit `deref!(_)` patterns.
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let test_actual = match test_in.to_vec() {
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deref!(b"0") => 0,
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deref!(b"1") => 1,
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_ => 2,
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};
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assert_eq!(test_actual, test_expect);
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}
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}
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