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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/dynamically-sized-types/dst-raw.rs | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-raw.rs b/src/test/ui/dynamically-sized-types/dst-raw.rs new file mode 100644 index 000000000..0893b02e7 --- /dev/null +++ b/src/test/ui/dynamically-sized-types/dst-raw.rs @@ -0,0 +1,138 @@ +// run-pass +// Test DST raw pointers + + +#![feature(unsized_tuple_coercion)] + +trait Trait { + fn foo(&self) -> isize; +} + +struct A { + f: isize +} +impl Trait for A { + fn foo(&self) -> isize { + self.f + } +} + +struct Foo<T: ?Sized> { + f: T +} + +pub fn main() { + // raw trait object + let x = A { f: 42 }; + let z: *const dyn Trait = &x; + let r = unsafe { + (&*z).foo() + }; + assert_eq!(r, 42); + + // raw DST struct + let p = Foo {f: A { f: 42 }}; + let o: *const Foo<dyn Trait> = &p; + let r = unsafe { + (&*o).f.foo() + }; + assert_eq!(r, 42); + + // raw DST tuple + let p = (A { f: 42 },); + let o: *const (dyn Trait,) = &p; + let r = unsafe { + (&*o).0.foo() + }; + assert_eq!(r, 42); + + // raw slice + let a: *const [_] = &[1, 2, 3]; + unsafe { + let b = (*a)[2]; + assert_eq!(b, 3); + let len = (*a).len(); + assert_eq!(len, 3); + } + + // raw slice with explicit cast + let a = &[1, 2, 3] as *const [i32]; + unsafe { + let b = (*a)[2]; + assert_eq!(b, 3); + let len = (*a).len(); + assert_eq!(len, 3); + } + + // raw DST struct with slice + let c: *const Foo<[_]> = &Foo {f: [1, 2, 3]}; + unsafe { + let b = (&*c).f[0]; + assert_eq!(b, 1); + let len = (&*c).f.len(); + assert_eq!(len, 3); + } + + // raw DST tuple with slice + let c: *const ([_],) = &([1, 2, 3],); + unsafe { + let b = (&*c).0[0]; + assert_eq!(b, 1); + let len = (&*c).0.len(); + assert_eq!(len, 3); + } + + // all of the above with *mut + let mut x = A { f: 42 }; + let z: *mut dyn Trait = &mut x; + let r = unsafe { + (&*z).foo() + }; + assert_eq!(r, 42); + + let mut p = Foo {f: A { f: 42 }}; + let o: *mut Foo<dyn Trait> = &mut p; + let r = unsafe { + (&*o).f.foo() + }; + assert_eq!(r, 42); + + let mut p = (A { f: 42 },); + let o: *mut (dyn Trait,) = &mut p; + let r = unsafe { + (&*o).0.foo() + }; + assert_eq!(r, 42); + + let a: *mut [_] = &mut [1, 2, 3]; + unsafe { + let b = (*a)[2]; + assert_eq!(b, 3); + let len = (*a).len(); + assert_eq!(len, 3); + } + + let a = &mut [1, 2, 3] as *mut [i32]; + unsafe { + let b = (*a)[2]; + assert_eq!(b, 3); + let len = (*a).len(); + assert_eq!(len, 3); + } + + let c: *mut Foo<[_]> = &mut Foo {f: [1, 2, 3]}; + unsafe { + let b = (&*c).f[0]; + assert_eq!(b, 1); + let len = (&*c).f.len(); + assert_eq!(len, 3); + } + + let c: *mut ([_],) = &mut ([1, 2, 3],); + unsafe { + let b = (&*c).0[0]; + assert_eq!(b, 1); + let len = (&*c).0.len(); + assert_eq!(len, 3); + } +} |