Removed unneeded errors from ProcessError

There are several errors in ProcessError that are unused in the
ProcessMonitor. This commit removed unused errors with the
exception of ExecveError which is being used in ponylang#1180.

CHANGELOG.md

@@ -17,6 +17,7 @@ All notable changes to the Pony compiler and standard library will be documented
 ### Changed
 
 - `Stringable` interface no longer involves formatting (issue #1285)
+- Remove unused error types from ProcessError (issue #1293)
 
 ## [0.4.0] - 2016-09-26
 

packages/process/_test.pony

@@ -243,12 +243,8 @@ class _ProcessClient is ProcessNotify
     match err
     | ExecveError   => _h.fail("ProcessError: ExecveError")
     | PipeError     => _h.fail("ProcessError: PipeError")
-    | Dup2Error     => _h.fail("ProcessError: Dup2Error")
     | ForkError     => _h.fail("ProcessError: ForkError")
-    | FcntlError    => _h.fail("ProcessError: FcntlError")
     | WaitpidError  => _h.fail("ProcessError: WaitpidError")
-    | CloseError    => _h.fail("ProcessError: CloseError")
-    | ReadError     => _h.fail("ProcessError: ReadError")
     | WriteError    => _h.fail("ProcessError: WriteError")
     | KillError     => _h.fail("ProcessError: KillError")
     | Unsupported   => _h.fail("ProcessError: Unsupported")

packages/process/process_monitor.pony

@@ -64,14 +64,11 @@ class ProcessClient is ProcessNotify
     match err
     | ExecveError   => _env.out.print("ProcessError: ExecveError")
     | PipeError     => _env.out.print("ProcessError: PipeError")
-    | Dup2Error     => _env.out.print("ProcessError: Dup2Error")
     | ForkError     => _env.out.print("ProcessError: ForkError")
-    | FcntlError    => _env.out.print("ProcessError: FcntlError")
     | WaitpidError  => _env.out.print("ProcessError: WaitpidError")
-    | CloseError    => _env.out.print("ProcessError: CloseError")
-    | ReadError     => _env.out.print("ProcessError: ReadError")
     | WriteError    => _env.out.print("ProcessError: WriteError")
     | KillError     => _env.out.print("ProcessError: KillError")
+    | CapError      => _env.out.print("ProcessError: CapError")
     | Unsupported   => _env.out.print("ProcessError: Unsupported")
     else
       _env.out.print("Unknown ProcessError!")
@@ -144,26 +141,18 @@ primitive _ONONBLOCK
 
 primitive ExecveError
 primitive PipeError
-primitive Dup2Error
 primitive ForkError
-primitive FcntlError
 primitive WaitpidError
-primitive CloseError
-primitive ReadError
 primitive WriteError
 primitive KillError
 primitive Unsupported // we throw this on non POSIX systems
 primitive CapError
 
 type ProcessError is
   ( ExecveError
-  | CloseError
-  | Dup2Error
-  | FcntlError
   | ForkError
   | KillError
   | PipeError
-  | ReadError
   | Unsupported
   | WaitpidError
   | WriteError