summaryrefslogtreecommitdiffstats
path: root/tests/ui/derives/deriving-with-repr-packed-2.rs
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:41 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:41 +0000
commit4f9fe856a25ab29345b90e7725509e9ee38a37be (patch)
treee4ffd8a9374cae7b21f7cbfb352927e0e074aff6 /tests/ui/derives/deriving-with-repr-packed-2.rs
parentAdding upstream version 1.68.2+dfsg1. (diff)
downloadrustc-upstream/1.69.0+dfsg1.tar.xz
rustc-upstream/1.69.0+dfsg1.zip
Adding upstream version 1.69.0+dfsg1.upstream/1.69.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--tests/ui/derives/deriving-with-repr-packed-2.rs20
1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/derives/deriving-with-repr-packed-2.rs b/tests/ui/derives/deriving-with-repr-packed-2.rs
new file mode 100644
index 000000000..79aca74df
--- /dev/null
+++ b/tests/ui/derives/deriving-with-repr-packed-2.rs
@@ -0,0 +1,20 @@
+// Check that deriving certain builtin traits on certain packed structs cause
+// errors. To avoid potentially misaligned references, field copies must be
+// used, which involves adding `T: Copy` bounds.
+
+#[derive(Copy, Clone, Default, PartialEq, Eq)]
+#[repr(packed)]
+pub struct Foo<T>(T, T, T);
+
+struct NonCopy;
+
+fn main() {
+ // This one is fine because `u32` impls `Copy`.
+ let x: Foo<u32> = Foo(1, 2, 3);
+ _ = x.clone();
+
+ // This one is an error because `NonCopy` doesn't impl `Copy`.
+ let x: Foo<NonCopy> = Foo(NonCopy, NonCopy, NonCopy);
+ _ = x.clone();
+ //~^ ERROR the method `clone` exists for struct `Foo<NonCopy>`, but its trait bounds were not satisfied
+}