Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/tests/ui/transmute/transmute-from-fn-item-types-error.rs b/tests/ui/transmute/transmute-from-fn-item-types-error.rs
new file mode 100644
index 000000000..f858a199e
--- /dev/null
+++ b/tests/ui/transmute/transmute-from-fn-item-types-error.rs
@@ -0,0 +1,60 @@
+use std::mem;
+
+unsafe fn foo() -> (i8, *const (), Option<fn()>) {
+    let i = mem::transmute(bar);
+    //~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
+
+
+    let p = mem::transmute(foo);
+    //~^ ERROR can't transmute zero-sized type
+
+
+    let of = mem::transmute(main);
+    //~^ ERROR can't transmute zero-sized type
+
+
+    (i, p, of)
+}
+
+unsafe fn bar() {
+    // Error as usual if the resulting type is not pointer-sized.
+    mem::transmute::<_, u8>(main);
+    //~^ ERROR cannot transmute between types of different sizes, or dependently-sized types
+
+
+    mem::transmute::<_, *mut ()>(foo);
+    //~^ ERROR can't transmute zero-sized type
+
+
+    mem::transmute::<_, fn()>(bar);
+    //~^ ERROR can't transmute zero-sized type
+
+
+    // No error if a coercion would otherwise occur.
+    mem::transmute::<fn(), usize>(main);
+}
+
+unsafe fn baz() {
+    mem::transmute::<_, *mut ()>(Some(foo));
+    //~^ ERROR can't transmute zero-sized type
+
+
+    mem::transmute::<_, fn()>(Some(bar));
+    //~^ ERROR can't transmute zero-sized type
+
+
+    mem::transmute::<_, Option<fn()>>(Some(baz));
+    //~^ ERROR can't transmute zero-sized type
+
+
+    // No error if a coercion would otherwise occur.
+    mem::transmute::<Option<fn()>, usize>(Some(main));
+}
+
+fn main() {
+    unsafe {
+        foo();
+        bar();
+        baz();
+    }
+}