Move spawn errors into executor.rs

Author: MajorBreakfast

src/libcore/task/executor.rs

@@ -12,7 +12,8 @@
             reason = "futures in libcore are unstable",
             issue = "50547")]
 
-use super::{TaskObj, SpawnObjError, SpawnErrorKind};
+use fmt;
+use super::{TaskObj, LocalTaskObj};
 
 /// A task executor.
 ///
@@ -42,3 +43,48 @@ pub trait Executor {
         Ok(())
     }
 }
+
+/// Provides the reason that an executor was unable to spawn.
+pub struct SpawnErrorKind {
+    _hidden: (),
+}
+
+impl fmt::Debug for SpawnErrorKind {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("SpawnErrorKind")
+            .field(&"shutdown")
+            .finish()
+    }
+}
+
+impl SpawnErrorKind {
+    /// Spawning is failing because the executor has been shut down.
+    pub fn shutdown() -> SpawnErrorKind {
+        SpawnErrorKind { _hidden: () }
+    }
+
+    /// Check whether this error is the `shutdown` error.
+    pub fn is_shutdown(&self) -> bool {
+        true
+    }
+}
+
+/// The result of a failed spawn
+#[derive(Debug)]
+pub struct SpawnObjError {
+    /// The kind of error
+    pub kind: SpawnErrorKind,
+
+    /// The task for which spawning was attempted
+    pub task: TaskObj,
+}
+
+/// The result of a failed spawn
+#[derive(Debug)]
+pub struct SpawnLocalObjError {
+    /// The kind of error
+    pub kind: SpawnErrorKind,
+
+    /// The task for which spawning was attempted
+    pub task: LocalTaskObj,
+}

src/libcore/task/mod.rs

@@ -18,14 +18,13 @@ mod context;
 pub use self::context::Context;
 
 mod executor;
-pub use self::executor::Executor;
+pub use self::executor::{
+  Executor, SpawnErrorKind, SpawnObjError, SpawnLocalObjError
+};
 
 mod poll;
 pub use self::poll::Poll;
 
-mod spawn_error;
-pub use self::spawn_error::{SpawnErrorKind, SpawnObjError, SpawnLocalObjError};
-
 mod task;
 pub use self::task::{TaskObj, LocalTaskObj, UnsafeTask};