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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/coercion/coerce-issue-49593-box-never-windows.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/coercion/coerce-issue-49593-box-never-windows.rs')
-rw-r--r-- | tests/ui/coercion/coerce-issue-49593-box-never-windows.rs | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/tests/ui/coercion/coerce-issue-49593-box-never-windows.rs b/tests/ui/coercion/coerce-issue-49593-box-never-windows.rs new file mode 100644 index 000000000..95d3935ca --- /dev/null +++ b/tests/ui/coercion/coerce-issue-49593-box-never-windows.rs @@ -0,0 +1,58 @@ +// revisions: nofallback fallback +// only-windows - the number of `Error` impls is platform-dependent +//[fallback] check-pass +//[nofallback] check-fail + +#![feature(never_type)] +#![cfg_attr(fallback, feature(never_type_fallback))] +#![allow(unreachable_code)] + +use std::error::Error; +use std::mem; + +fn raw_ptr_box<T>(t: T) -> *mut T { + panic!() +} + +fn foo(x: !) -> Box<dyn Error> { + /* *mut $0 is coerced to Box<dyn Error> here */ Box::<_ /* ! */>::new(x) + //[nofallback]~^ ERROR trait bound `(): std::error::Error` is not satisfied +} + +fn foo_raw_ptr(x: !) -> *mut dyn Error { + /* *mut $0 is coerced to *mut Error here */ raw_ptr_box::<_ /* ! */>(x) + //[nofallback]~^ ERROR trait bound `(): std::error::Error` is not satisfied +} + +fn no_coercion(d: *mut dyn Error) -> *mut dyn Error { + /* an unsize coercion won't compile here, and it is indeed not used + because there is nothing requiring the _ to be Sized */ + d as *mut _ +} + +trait Xyz {} +struct S; +struct T; +impl Xyz for S {} +impl Xyz for T {} + +fn foo_no_never() { + let mut x /* : Option<S> */ = None; + let mut first_iter = false; + loop { + if !first_iter { + let y: Box<dyn Xyz> + = /* Box<$0> is coerced to Box<Xyz> here */ Box::new(x.unwrap()); + } + + x = Some(S); + first_iter = true; + } + + let mut y : Option<S> = None; + // assert types are equal + mem::swap(&mut x, &mut y); +} + +fn main() { +} |