diff options
Diffstat (limited to 'src/test/ui/lub-glb/old-lub-glb-hr-noteq2.rs')
-rw-r--r-- | src/test/ui/lub-glb/old-lub-glb-hr-noteq2.rs | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/src/test/ui/lub-glb/old-lub-glb-hr-noteq2.rs b/src/test/ui/lub-glb/old-lub-glb-hr-noteq2.rs deleted file mode 100644 index 9940c40da..000000000 --- a/src/test/ui/lub-glb/old-lub-glb-hr-noteq2.rs +++ /dev/null @@ -1,39 +0,0 @@ -// Test taking the LUB of two function types that are not equatable but where -// one is more general than the other. Test the case where the more general type -// (`x`) is the second match arm specifically. -// -// FIXME(#73154) Pure NLL checker without leak check accepts this test. -// (Note that it still errors in old-lub-glb-hr-noteq1.rs). What happens -// is that, due to the ordering of the match arms, we pick the correct "more -// general" fn type, and we ignore the errors from the non-NLL type checker that -// requires equality. The NLL type checker only requires a subtyping -// relationship, and that holds. To unblock landing NLL - and ensure that we can -// choose to make this always in error in the future - we perform the leak check -// after coercing a function pointer. - -// revisions: leak noleak -//[noleak] compile-flags: -Zno-leak-check - -//[noleak] check-pass - -fn foo(x: for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8, y: for<'a> fn(&'a u8, &'a u8) -> &'a u8) { - // The two types above are not equivalent. With the older LUB/GLB - // algorithm, this may have worked (I don't remember), but now it - // doesn't because we require equality. - let z = match 22 { - 0 => y, - _ => x, - //[leak]~^ ERROR `match` arms have incompatible types - }; -} - -fn foo_cast(x: for<'a, 'b> fn(&'a u8, &'b u8) -> &'a u8, y: for<'a> fn(&'a u8, &'a u8) -> &'a u8) { - // But we can *upcast* explicitly the type of `x` and figure - // things out: - let z = match 22 { - 0 => x as for<'a> fn(&'a u8, &'a u8) -> &'a u8, - _ => y, - }; -} - -fn main() {} |