103 lines
3.1 KiB
Rust
103 lines
3.1 KiB
Rust
#![feature(exclusive_range_pattern)]
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#![allow(overlapping_range_endpoints)]
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#![allow(non_contiguous_range_endpoints)]
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#![deny(unreachable_patterns)]
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macro_rules! m {
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($s:expr, $($t:tt)+) => {
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match $s { $($t)+ => {} }
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}
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}
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macro_rules! test_int {
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($s:expr, $min:path, $max:path) => {
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m!($s, $min..=$max);
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m!($s, $min..5 | 5..=$max);
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m!($s, $min..=4 | 5..=$max);
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m!($s, $min..$max | $max);
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m!(($s, true), ($min..5, true) | (5..=$max, true) | ($min..=$max, false));
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}
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}
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fn main() {
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test_int!(0u8, u8::MIN, u8::MAX);
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test_int!(0u16, u16::MIN, u16::MAX);
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test_int!(0u32, u32::MIN, u32::MAX);
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test_int!(0u64, u64::MIN, u64::MAX);
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test_int!(0u128, u128::MIN, u128::MAX);
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test_int!(0i8, i8::MIN, i8::MAX);
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test_int!(0i16, i16::MIN, i16::MAX);
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test_int!(0i32, i32::MIN, i32::MAX);
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test_int!(0i64, i64::MIN, i64::MAX);
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test_int!(0i128, i128::MIN, i128::MAX);
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m!('a', '\u{0}'..=char::MAX);
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m!('a', '\u{0}'..='\u{10_FFFF}');
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// We can get away with just covering the following two ranges, which correspond to all valid
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// Unicode Scalar Values.
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m!('a', '\u{0}'..='\u{D7FF}' | '\u{E000}'..=char::MAX);
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m!('a', '\u{0}'..'\u{D7FF}' | '\u{D7FF}' | '\u{E000}'..=char::MAX);
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let 0..=255 = 0u8;
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let -128..=127 = 0i8;
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let -2147483648..=2147483647 = 0i32;
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let '\u{0000}'..='\u{10FFFF}' = 'v';
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// Almost exhaustive
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m!(0u8, 0..255); //~ ERROR non-exhaustive patterns
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m!(0u8, 0..=254); //~ ERROR non-exhaustive patterns
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m!(0u8, 1..=255); //~ ERROR non-exhaustive patterns
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m!(0u8, 0..42 | 43..=255); //~ ERROR non-exhaustive patterns
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m!(0i8, -128..127); //~ ERROR non-exhaustive patterns
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m!(0i8, -128..=126); //~ ERROR non-exhaustive patterns
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m!(0i8, -127..=127); //~ ERROR non-exhaustive patterns
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match 0i8 { //~ ERROR non-exhaustive patterns
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i8::MIN ..= -1 => {}
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1 ..= i8::MAX => {}
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}
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const ALMOST_MAX: u128 = u128::MAX - 1;
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m!(0u128, 0..=ALMOST_MAX); //~ ERROR non-exhaustive patterns
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m!(0u128, 0..=4); //~ ERROR non-exhaustive patterns
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m!(0u128, 1..=u128::MAX); //~ ERROR non-exhaustive patterns
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// More complicatedly (non-)exhaustive
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match 0u8 {
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0 ..= 30 => {}
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20 ..= 70 => {}
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50 ..= 255 => {}
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}
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match (0u8, true) { //~ ERROR non-exhaustive patterns
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(0 ..= 125, false) => {}
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(128 ..= 255, false) => {}
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(0 ..= 255, true) => {}
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}
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match (0u8, true) { // ok
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(0 ..= 125, false) => {}
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(128 ..= 255, false) => {}
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(0 ..= 255, true) => {}
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(125 .. 128, false) => {}
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}
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match (true, 0u8) {
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(true, 0 ..= 255) => {}
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(false, 0 ..= 125) => {}
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(false, 128 ..= 255) => {}
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(false, 125 .. 128) => {}
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}
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match Some(0u8) {
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None => {}
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Some(0 ..= 125) => {}
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Some(128 ..= 255) => {}
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Some(125 .. 128) => {}
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}
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const FOO: u8 = 41;
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const BAR: &u8 = &42;
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match &0u8 {
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0..41 => {}
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&FOO => {}
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BAR => {}
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43..=255 => {}
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}
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}
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