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Diffstat (limited to '')
| -rw-r--r-- | src/test/ui/cast/cast-rfc0401.rs | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/test/ui/cast/cast-rfc0401.rs b/src/test/ui/cast/cast-rfc0401.rs new file mode 100644 index 000000000..996fa013f --- /dev/null +++ b/src/test/ui/cast/cast-rfc0401.rs @@ -0,0 +1,173 @@ +// run-pass + +#![allow(dead_code)] + +use std::vec; + +enum Simple { + A, + B, + C +} + +enum Valued { + H8=163, + Z=0, + X=256, + H7=67, +} + +enum ValuedSigned { + M1=-1, + P1=1 +} + +fn main() +{ + // coercion-cast + let mut it = vec![137].into_iter(); + let itr: &mut vec::IntoIter<u32> = &mut it; + assert_eq!((itr as &mut dyn Iterator<Item=u32>).next(), Some(137)); + assert_eq!((itr as &mut dyn Iterator<Item=u32>).next(), None); + + assert_eq!(Some(4u32) as Option<u32>, Some(4u32)); + assert_eq!((1u32,2u32) as (u32,u32), (1,2)); + + // this isn't prim-int-cast. Check that it works. + assert_eq!(false as bool, false); + assert_eq!(true as bool, true); + + // numeric-cast + let l: u64 = 0x8090a0b0c0d0e0f0; + let lsz: usize = l as usize; + assert_eq!(l as u32, 0xc0d0e0f0); + + // numeric-cast + assert_eq!(l as u8, 0xf0); + assert_eq!(l as i8,-0x10); + assert_eq!(l as u32, 0xc0d0e0f0); + assert_eq!(l as u32 as usize as u32, l as u32); + assert_eq!(l as i32,-0x3f2f1f10); + assert_eq!(l as i32 as isize as i32, l as i32); + assert_eq!(l as i64,-0x7f6f5f4f3f2f1f10); + + assert_eq!(0 as f64, 0f64); + assert_eq!(1 as f64, 1f64); + + assert_eq!(l as f64, 9264081114510712022f64); + + assert_eq!(l as i64 as f64, -9182662959198838444f64); +// float overflow : needs fixing +// assert_eq!(l as f32 as i64 as u64, 9264082620822882088u64); +// assert_eq!(l as i64 as f32 as i64, 9182664080220408446i64); + + assert_eq!(4294967040f32 as u32, 0xffffff00u32); + assert_eq!(1.844674407370955e19f64 as u64, 0xfffffffffffff800u64); + + assert_eq!(9.223372036854775e18f64 as i64, 0x7ffffffffffffc00i64); + assert_eq!(-9.223372036854776e18f64 as i64, 0x8000000000000000u64 as i64); + + // addr-ptr-cast/ptr-addr-cast (thin ptr) + let p: *const [u8; 1] = lsz as *const [u8; 1]; + assert_eq!(p as usize, lsz); + + // ptr-ptr-cast (thin ptr) + let w: *const () = p as *const (); + assert_eq!(w as usize, lsz); + + // ptr-ptr-cast (fat->thin) + let u: *const [u8] = unsafe{&*p}; + assert_eq!(u as *const u8, p as *const u8); + assert_eq!(u as *const u16, p as *const u16); + + // ptr-ptr-cast (Length vtables) + let mut l : [u8; 2] = [0,1]; + let w: *mut [u16; 2] = &mut l as *mut [u8; 2] as *mut _; + let w: *mut [u16] = unsafe {&mut *w}; + let w_u8 : *const [u8] = w as *const [u8]; + assert_eq!(unsafe{&*w_u8}, &l); + + let s: *mut str = w as *mut str; + let l_via_str = unsafe{&*(s as *const [u8])}; + assert_eq!(&l, l_via_str); + + // ptr-ptr-cast (Length vtables, check length is preserved) + let l: [[u8; 3]; 2] = [[3, 2, 6], [4, 5, 1]]; + let p: *const [[u8; 3]] = &l; + let p: &[[u8; 2]] = unsafe {&*(p as *const [[u8; 2]])}; + assert_eq!(p, [[3, 2], [6, 4]]); + + // enum-cast + assert_eq!(Simple::A as u8, 0); + assert_eq!(Simple::B as u8, 1); + + assert_eq!(Valued::H8 as i8, -93); + assert_eq!(Valued::H7 as i8, 67); + assert_eq!(Valued::Z as i8, 0); + + assert_eq!(Valued::H8 as u8, 163); + assert_eq!(Valued::H7 as u8, 67); + assert_eq!(Valued::Z as u8, 0); + + assert_eq!(Valued::H8 as u16, 163); + assert_eq!(Valued::Z as u16, 0); + assert_eq!(Valued::H8 as u16, 163); + assert_eq!(Valued::Z as u16, 0); + + assert_eq!(ValuedSigned::M1 as u16, 65535); + assert_eq!(ValuedSigned::M1 as i16, -1); + assert_eq!(ValuedSigned::P1 as u16, 1); + assert_eq!(ValuedSigned::P1 as i16, 1); + + // prim-int-cast + assert_eq!(false as u16, 0); + assert_eq!(true as u16, 1); + assert_eq!(false as i64, 0); + assert_eq!(true as i64, 1); + assert_eq!('a' as u32, 0x61); + assert_eq!('a' as u16, 0x61); + assert_eq!('a' as u8, 0x61); + assert_eq!('א' as u8, 0xd0); + assert_eq!('א' as u16, 0x5d0); + assert_eq!('א' as u32, 0x5d0); + assert_eq!('🐵' as u8, 0x35); + assert_eq!('🐵' as u16, 0xf435); + assert_eq!('🐵' as u32, 0x1f435); + assert_eq!('英' as i16, -0x7d0f); + assert_eq!('英' as u16, 0x82f1); + + // u8-char-cast + assert_eq!(0x61 as char, 'a'); + assert_eq!(0u8 as char, '\0'); + assert_eq!(0xd7 as char, '×'); + + // array-ptr-cast + let x = [1,2,3]; + let first : *const u32 = &x[0]; + + assert_eq!(first, &x as *const _); + assert_eq!(first, &x as *const u32); + + // fptr-addr-cast + fn foo() { + println!("foo!"); + } + fn bar() { + println!("bar!"); + } + + assert!(foo as usize != bar as usize); + + // Taking a few bits of a function's address is totally pointless and we detect that + // Disabling the lint to ensure that the assertion can still be run + #[allow(const_err)] + { + assert_eq!(foo as i16, foo as usize as i16); + } + + // fptr-ptr-cast + + assert_eq!(foo as *const u8 as usize, foo as usize); + assert!(foo as *const u32 != first); +} +fn foo() { } |