Auto merge of #86950 - tmiasko:personality, r=nagisa

Use existing declaration of rust_eh_personality

If crate declares `rust_eh_personality`, re-use existing declaration
as otherwise attempts to set function attributes that follow the
declaration will fail (unless it happens to have exactly the same
type signature as the one predefined in the compiler).

Fixes #70117.
Fixes https://github.com/rust-lang/rust/pull/81469#issuecomment-809428126; probably.

1 files changed, 24 insertions, 0 deletions

diff --git a/src/test/ui/panic-runtime/incompatible-type.rs b/src/test/ui/panic-runtime/incompatible-type.rs
new file mode 100644
index 00000000000..026364a2058
--- /dev/null
+++ b/src/test/ui/panic-runtime/incompatible-type.rs
@@ -0,0 +1,24 @@
+// Check that rust_eh_personality can have a different type signature than the
+// one hardcoded in the compiler.  Regression test for #70117. Used to fail with:
+//
+// Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
+//
+// build-pass
+// compile-flags: --crate-type=lib -Ccodegen-units=1
+#![no_std]
+#![panic_runtime]
+#![feature(panic_runtime)]
+#![feature(rustc_attrs)]
+
+pub struct DropMe;
+
+impl Drop for DropMe {
+    fn drop(&mut self) {}
+}
+
+pub fn test(_: DropMe) {
+    unreachable!();
+}
+
+#[rustc_std_internal_symbol]
+pub unsafe extern "C" fn rust_eh_personality() {}