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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:03 +0000
commit64d98f8ee037282c35007b64c2649055c56af1db (patch)
tree5492bcf97fce41ee1c0b1cc2add283f3e66cdab0 /src/test/ui/nll/user-annotations/issue-55748-pat-types-constrain-bindings.rs
parentAdding debian version 1.67.1+dfsg1-1. (diff)
downloadrustc-64d98f8ee037282c35007b64c2649055c56af1db.tar.xz
rustc-64d98f8ee037282c35007b64c2649055c56af1db.zip
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/nll/user-annotations/issue-55748-pat-types-constrain-bindings.rs')
-rw-r--r--src/test/ui/nll/user-annotations/issue-55748-pat-types-constrain-bindings.rs68
1 files changed, 0 insertions, 68 deletions
diff --git a/src/test/ui/nll/user-annotations/issue-55748-pat-types-constrain-bindings.rs b/src/test/ui/nll/user-annotations/issue-55748-pat-types-constrain-bindings.rs
deleted file mode 100644
index c71937a50..000000000
--- a/src/test/ui/nll/user-annotations/issue-55748-pat-types-constrain-bindings.rs
+++ /dev/null
@@ -1,68 +0,0 @@
-// This test is ensuring that type ascriptions on let bindings
-// constrain both:
-//
-// 1. the input expression on the right-hand side (after any potential
-// coercion, and allowing for covariance), *and*
-//
-// 2. the bindings (if any) nested within the pattern on the left-hand
-// side (and here, the type-constraint is *invariant*).
-
-#![allow(dead_code, unused_mut)]
-type PairUncoupled<'a, 'b, T> = (&'a T, &'b T);
-type PairCoupledRegions<'a, T> = (&'a T, &'a T);
-type PairCoupledTypes<T> = (T, T);
-
-fn uncoupled_lhs<'a>(_x: &'a u32, s: &'static u32) -> &'static u32 {
- let ((mut y, mut _z),): (PairUncoupled<u32>,) = ((s, &_x),); // ok
- // Above compiling does *not* imply below would compile.
- // ::std::mem::swap(&mut y, &mut _z);
- y
-}
-
-fn swap_regions((mut y, mut _z): PairCoupledRegions<u32>) {
- ::std::mem::swap(&mut y, &mut _z);
-}
-
-fn coupled_regions_lhs<'a>(_x: &'a u32, s: &'static u32) -> &'static u32 {
- let ((y, _z),): (PairCoupledRegions<u32>,) = ((s, &_x),);
- // If above line compiled, so should line below ...
-
- // swap_regions((y, _z));
-
- // ... but the ascribed type also invalidates this use of `y`
- y //~ ERROR lifetime may not live long enough
-}
-
-fn swap_types((mut y, mut _z): PairCoupledTypes<&u32>) {
- ::std::mem::swap(&mut y, &mut _z);
-}
-
-fn coupled_types_lhs<'a>(_x: &'a u32, s: &'static u32) -> &'static u32 {
- let ((y, _z),): (PairCoupledTypes<&u32>,) = ((s, &_x),);
- // If above line compiled, so should line below ...
-
- // swap_types((y, _z));
-
- // ... but the ascribed type also invalidates this use of `y`
- y //~ ERROR lifetime may not live long enough
-}
-
-fn swap_wilds((mut y, mut _z): PairCoupledTypes<&u32>) {
- ::std::mem::swap(&mut y, &mut _z);
-}
-
-fn coupled_wilds_lhs<'a>(_x: &'a u32, s: &'static u32) -> &'static u32 {
- let ((y, _z),): (PairCoupledTypes<_>,) = ((s, &_x),);
- // If above line compiled, so should line below
- // swap_wilds((y, _z));
-
- // ... but the ascribed type also invalidates this use of `y`
- y //~ ERROR lifetime may not live long enough
-}
-
-fn main() {
- uncoupled_lhs(&3, &4);
- coupled_regions_lhs(&3, &4);
- coupled_types_lhs(&3, &4);
- coupled_wilds_lhs(&3, &4);
-}