Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

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

1 files changed, 26 insertions, 0 deletions

diff --git a/compiler/rustc_span/src/fatal_error.rs b/compiler/rustc_span/src/fatal_error.rs
new file mode 100644
index 000000000..fa84c486d
--- /dev/null
+++ b/compiler/rustc_span/src/fatal_error.rs
@@ -0,0 +1,26 @@
+/// Used as a return value to signify a fatal error occurred. (It is also
+/// used as the argument to panic at the moment, but that will eventually
+/// not be true.)
+#[derive(Copy, Clone, Debug)]
+#[must_use]
+pub struct FatalError;
+
+pub struct FatalErrorMarker;
+
+// Don't implement Send on FatalError. This makes it impossible to panic!(FatalError).
+// We don't want to invoke the panic handler and print a backtrace for fatal errors.
+impl !Send for FatalError {}
+
+impl FatalError {
+    pub fn raise(self) -> ! {
+        std::panic::resume_unwind(Box::new(FatalErrorMarker))
+    }
+}
+
+impl std::fmt::Display for FatalError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "fatal error")
+    }
+}
+
+impl std::error::Error for FatalError {}