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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/regions/regions-implied-bounds-projection-gap-1.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/regions/regions-implied-bounds-projection-gap-1.rs')
-rw-r--r-- | src/test/ui/regions/regions-implied-bounds-projection-gap-1.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-implied-bounds-projection-gap-1.rs b/src/test/ui/regions/regions-implied-bounds-projection-gap-1.rs new file mode 100644 index 000000000..38fc9c462 --- /dev/null +++ b/src/test/ui/regions/regions-implied-bounds-projection-gap-1.rs @@ -0,0 +1,30 @@ +// Illustrates the "projection gap": in this test, even though we know +// that `T::Foo: 'x`, that does not tell us that `T: 'x`, because +// there might be other ways for the caller of `func` to show that +// `T::Foo: 'x` holds (e.g., where-clause). + +trait Trait1<'x> { + type Foo; +} + +// calling this fn should trigger a check that the type argument +// supplied is well-formed. +fn wf<T>() { } + +fn func<'x, T:Trait1<'x>>(t: &'x T::Foo) +{ + wf::<&'x T>(); + //~^ ERROR the parameter type `T` may not live long enough +} + +fn caller2<'x, T:Trait1<'x>>(t: &'x T) +{ + wf::<&'x T::Foo>(); // OK +} + +fn caller3<'x, T:Trait1<'x>>(t: &'x T::Foo) +{ + wf::<&'x T::Foo>(); // OK +} + +fn main() { } |