Move internal job ID type

Move this type to where its non-default instances are constructed.

src/proc.rs

@@ -19,7 +19,7 @@
     redirection::RedirectionSpecList,
     signal::{Signal, signal_set_handlers_once},
     topic_monitor::{GenerationsList, Topic, topic_monitor_principal},
-    wait_handle::{InternalJobId, WaitHandle, WaitHandleRef, WaitHandleStore},
+    wait_handle::{WaitHandle, WaitHandleRef, WaitHandleStore},
     wutil::{perror_nix, wbasename},
 };
 use cfg_if::cfg_if;
@@ -607,6 +607,10 @@ pub struct JobFlags {
     pub is_group_root: bool,
 }
 
+/// The non user-visible, never-recycled job ID.
+/// Every job has a unique positive value for this.
+pub type InternalJobId = u64;
+
 /// A struct representing a job. A job is a pipeline of one or more processes.
 #[derive(Default)]
 pub struct Job {

src/wait_handle.rs

@@ -1,12 +1,8 @@
 use crate::prelude::*;
-use crate::proc::Pid;
+use crate::proc::{InternalJobId, Pid};
 use std::cell::Cell;
 use std::rc::Rc;
 
-/// The non user-visible, never-recycled job ID.
-/// Every job has a unique positive value for this.
-pub type InternalJobId = u64;
-
 /// The bits of a job necessary to support 'wait' and '--on-process-exit'.
 /// This may outlive the job.
 pub struct WaitHandle {