--- a/ipc/ipdl/ipdl/cgen.py
+++ b/ipc/ipdl/ipdl/cgen.py
@@ -1,16 +1,15 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import os, sys
 
 from ipdl.ast import Visitor
-from ipdl.ast import IN, OUT, INOUT, ASYNC, SYNC, INTR
 
 class CodePrinter:
     def __init__(self, outf=sys.stdout, indentCols=4):
         self.outf = outf
         self.col = 0
         self.indentCols = indentCols
 
     def write(self, str):

--- a/ipc/ipdl/ipdl/type.py
+++ b/ipc/ipdl/ipdl/type.py
@@ -1445,18 +1445,16 @@ class CheckTypes(TcheckVisitor):
         if not mgstype.isManagedBy(ptype):
             self.error(
                 loc,
                 "|manages| declaration in protocol `%s' does not match any |manager| declaration in protocol `%s'",
                 pname, mgsname)
 
 
     def visitManager(self, mgr):
-        # FIXME/bug 541126: check that the protocol graph is acyclic
-
         pdecl = mgr.of.decl
         ptype, pname = pdecl.type, pdecl.shortname
 
         mgrdecl = mgr.decl
         mgrtype, mgrname = mgrdecl.type, mgrdecl.shortname
 
         # we added this information; sanity check it
         assert ptype.isManagedBy(mgrtype)