tests/ui/half-open-range-patterns/half-open-range-pats-semantics.rs

   1 // run-pass
   2
   3 // Test half-open range patterns against their expression equivalents
   4 // via `.contains(...)` and make sure the dynamic semantics match.
   5
   6 #![feature(exclusive_range_pattern)]
   7 #![allow(illegal_floating_point_literal_pattern)]
   8 #![allow(unreachable_patterns)]
   9
  10 macro_rules! yes {
  11     ($scrutinee:expr, $($t:tt)+) => {
  12         {
  13             let m = match $scrutinee { $($t)+ => true, _ => false, };
  14             let c = ($($t)+).contains(&$scrutinee);
  15             assert_eq!(m, c);
  16             m
  17         }
  18     }
  19 }
  20
  21 fn range_to_inclusive() {
  22     // `..=X` (`RangeToInclusive`-equivalent):
  23     //---------------------------------------
  24
  25     // u8; `..=X`
  26     assert!(yes!(u8::MIN, ..=u8::MIN));
  27     assert!(yes!(u8::MIN, ..=5));
  28     assert!(yes!(5u8, ..=5));
  29     assert!(!yes!(6u8, ..=5));
  30
  31     // i16; `..=X`
  32     assert!(yes!(i16::MIN, ..=i16::MIN));
  33     assert!(yes!(i16::MIN, ..=0));
  34     assert!(yes!(i16::MIN, ..=-5));
  35     assert!(yes!(-5, ..=-5));
  36     assert!(!yes!(-4, ..=-5));
  37
  38     // char; `..=X`
  39     assert!(yes!('\u{0}', ..='\u{0}'));
  40     assert!(yes!('\u{0}', ..='a'));
  41     assert!(yes!('a', ..='a'));
  42     assert!(!yes!('b', ..='a'));
  43
  44     // f32; `..=X`
  45     assert!(yes!(f32::NEG_INFINITY, ..=f32::NEG_INFINITY));
  46     assert!(yes!(f32::NEG_INFINITY, ..=1.0f32));
  47     assert!(yes!(1.5f32, ..=1.5f32));
  48     assert!(!yes!(1.6f32, ..=-1.5f32));
  49
  50     // f64; `..=X`
  51     assert!(yes!(f64::NEG_INFINITY, ..=f64::NEG_INFINITY));
  52     assert!(yes!(f64::NEG_INFINITY, ..=1.0f64));
  53     assert!(yes!(1.5f64, ..=1.5f64));
  54     assert!(!yes!(1.6f64, ..=-1.5f64));
  55 }
  56
  57 fn range_to() {
  58     // `..X` (`RangeTo`-equivalent):
  59     //-----------------------------
  60
  61     // u8; `..X`
  62     assert!(yes!(0u8, ..1));
  63     assert!(yes!(0u8, ..5));
  64     assert!(!yes!(5u8, ..5));
  65     assert!(!yes!(6u8, ..5));
  66
  67     // u8; `..X`
  68     const NU8: u8 = u8::MIN + 1;
  69     assert!(yes!(u8::MIN, ..NU8));
  70     assert!(yes!(0u8, ..5));
  71     assert!(!yes!(5u8, ..5));
  72     assert!(!yes!(6u8, ..5));
  73
  74     // i16; `..X`
  75     const NI16: i16 = i16::MIN + 1;
  76     assert!(yes!(i16::MIN, ..NI16));
  77     assert!(yes!(i16::MIN, ..5));
  78     assert!(yes!(-6, ..-5));
  79     assert!(!yes!(-5, ..-5));
  80
  81     // char; `..X`
  82     assert!(yes!('\u{0}', ..'\u{1}'));
  83     assert!(yes!('\u{0}', ..'a'));
  84     assert!(yes!('a', ..'b'));
  85     assert!(!yes!('a', ..'a'));
  86     assert!(!yes!('b', ..'a'));
  87
  88     // f32; `..X`
  89     assert!(yes!(f32::NEG_INFINITY, ..1.0f32));
  90     assert!(!yes!(1.5f32, ..1.5f32));
  91     const E32: f32 = 1.5f32 + f32::EPSILON;
  92     assert!(yes!(1.5f32, ..E32));
  93     assert!(!yes!(1.6f32, ..1.5f32));
  94
  95     // f64; `..X`
  96     assert!(yes!(f64::NEG_INFINITY, ..1.0f64));
  97     assert!(!yes!(1.5f64, ..1.5f64));
  98     const E64: f64 = 1.5f64 + f64::EPSILON;
  99     assert!(yes!(1.5f64, ..E64));
 100     assert!(!yes!(1.6f64, ..1.5f64));
 101 }
 102
 103 fn range_from() {
 104     // `X..` (`RangeFrom`-equivalent):
 105     //--------------------------------
 106
 107     // u8; `X..`
 108     assert!(yes!(u8::MIN, u8::MIN..));
 109     assert!(yes!(u8::MAX, u8::MIN..));
 110     assert!(!yes!(u8::MIN, 1..));
 111     assert!(!yes!(4, 5..));
 112     assert!(yes!(5, 5..));
 113     assert!(yes!(6, 5..));
 114     assert!(yes!(u8::MAX, u8::MAX..));
 115
 116     // i16; `X..`
 117     assert!(yes!(i16::MIN, i16::MIN..));
 118     assert!(yes!(i16::MAX, i16::MIN..));
 119     const NI16: i16 = i16::MIN + 1;
 120     assert!(!yes!(i16::MIN, NI16..));
 121     assert!(!yes!(-4, 5..));
 122     assert!(yes!(-4, -4..));
 123     assert!(yes!(-3, -4..));
 124     assert!(yes!(i16::MAX, i16::MAX..));
 125
 126     // char; `X..`
 127     assert!(yes!('\u{0}', '\u{0}'..));
 128     assert!(yes!(core::char::MAX, '\u{0}'..));
 129     assert!(yes!('a', 'a'..));
 130     assert!(yes!('b', 'a'..));
 131     assert!(!yes!('a', 'b'..));
 132     assert!(yes!(core::char::MAX, core::char::MAX..));
 133
 134     // f32; `X..`
 135     assert!(yes!(f32::NEG_INFINITY, f32::NEG_INFINITY..));
 136     assert!(yes!(f32::INFINITY, f32::NEG_INFINITY..));
 137     assert!(!yes!(f32::NEG_INFINITY, 1.0f32..));
 138     assert!(yes!(f32::INFINITY, 1.0f32..));
 139     assert!(!yes!(1.0f32 - f32::EPSILON, 1.0f32..));
 140     assert!(yes!(1.0f32, 1.0f32..));
 141     assert!(yes!(f32::INFINITY, 1.0f32..));
 142     assert!(yes!(f32::INFINITY, f32::INFINITY..));
 143
 144     // f64; `X..`
 145     assert!(yes!(f64::NEG_INFINITY, f64::NEG_INFINITY..));
 146     assert!(yes!(f64::INFINITY, f64::NEG_INFINITY..));
 147     assert!(!yes!(f64::NEG_INFINITY, 1.0f64..));
 148     assert!(yes!(f64::INFINITY, 1.0f64..));
 149     assert!(!yes!(1.0f64 - f64::EPSILON, 1.0f64..));
 150     assert!(yes!(1.0f64, 1.0f64..));
 151     assert!(yes!(f64::INFINITY, 1.0f64..));
 152     assert!(yes!(f64::INFINITY, f64::INFINITY..));
 153 }
 154
 155 fn main() {
 156     range_to_inclusive();
 157     range_to();
 158     range_from();
 159 }