Merge tag 'debian/1.52.1+dfsg1-1_exp2' into proxmox/buster

[rustc.git] / vendor / crossbeam-queue / src / err.rs

diff --git a/vendor/crossbeam-queue/src/err.rs b/vendor/crossbeam-queue/src/err.rs
new file mode 100644 (file)
index 0000000..42880e8
--- /dev/null
+++ b/vendor/crossbeam-queue/src/err.rs
@@ -0,0 +1,47 @@
+use core::fmt;
+
+/// Error which occurs when popping from an empty queue.
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub struct PopError;
+
+impl fmt::Debug for PopError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        "PopError".fmt(f)
+    }
+}
+
+impl fmt::Display for PopError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        "popping from an empty queue".fmt(f)
+    }
+}
+
+#[cfg(features = "std")]
+impl std::error::Error for PopError {
+    fn description(&self) -> &str {
+        "popping from an empty queue"
+    }
+}
+
+/// Error which occurs when pushing into a full queue.
+#[derive(Clone, Copy, Eq, PartialEq)]
+pub struct PushError<T>(pub T);
+
+impl<T> fmt::Debug for PushError<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        "PushError(..)".fmt(f)
+    }
+}
+
+impl<T> fmt::Display for PushError<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        "pushing into a full queue".fmt(f)
+    }
+}
+
+#[cfg(features = "std")]
+impl<T: Send> std::error::Error for PushError<T> {
+    fn description(&self) -> &str {
+        "pushing into a full queue"
+    }
+}