_signals.py: Remove code for python3.5 support

1 files changed, 3 insertions, 10 deletions

diff --git a/src/buildstream/_signals.py b/src/buildstream/_signals.py
index 969789e92..03b55b052 100644
--- a/src/buildstream/_signals.py
+++ b/src/buildstream/_signals.py
@@ -23,22 +23,15 @@ import threading
 import traceback
 from contextlib import contextmanager, ExitStack
 from collections import deque
-from typing import TYPE_CHECKING
-
-if TYPE_CHECKING:
-    from typing import Callable, MutableSequence
+from typing import Callable, Deque
 
 
 # Global per process state for handling of sigterm/sigtstp/sigcont,
 # note that it is expected that this only ever be used by new processes
 # the scheduler starts, not the main process.
 #
-# FIXME: We should ideally be using typing.Deque as type hints below, not
-# typing.MutableSequence. However, that is only available in Python versions
-# 3.5.4 onward and 3.6.1 onward.
-# Debian 9 ships with 3.5.3.
-terminator_stack = deque()  # type: MutableSequence[Callable]
-suspendable_stack = deque()  # type: MutableSequence[Callable]
+terminator_stack: Deque[Callable] = deque()
+suspendable_stack: Deque[Callable] = deque()
 
 
 # Per process SIGTERM handler