From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- tests/ui/cast/fat-ptr-cast-rpass.rs | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 tests/ui/cast/fat-ptr-cast-rpass.rs (limited to 'tests/ui/cast/fat-ptr-cast-rpass.rs') diff --git a/tests/ui/cast/fat-ptr-cast-rpass.rs b/tests/ui/cast/fat-ptr-cast-rpass.rs new file mode 100644 index 000000000..f5747eb8b --- /dev/null +++ b/tests/ui/cast/fat-ptr-cast-rpass.rs @@ -0,0 +1,34 @@ +// run-pass + +#![feature(ptr_metadata)] + +trait Foo { + fn foo(&self) {} +} + +struct Bar; + +impl Foo for Bar {} + +fn main() { + // Test we can turn a fat pointer to array back into a thin pointer. + let a: *const [i32] = &[1, 2, 3]; + let b = a as *const [i32; 2]; + unsafe { + assert_eq!(*b, [1, 2]); + } + + // Test conversion to an address (usize). + let a: *const [i32; 3] = &[1, 2, 3]; + let b: *const [i32] = a; + assert_eq!(a as usize, b as *const () as usize); + + // And conversion to a void pointer/address for trait objects too. + let a: *mut dyn Foo = &mut Bar; + let b = a as *mut () as usize; + let c = a as *const () as usize; + let d = a.to_raw_parts().0 as usize; + + assert_eq!(b, d); + assert_eq!(c, d); +} -- cgit v1.2.3