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-rw-r--r--linuxnamespaces/syscalls.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/linuxnamespaces/syscalls.py b/linuxnamespaces/syscalls.py
index 8f5e25b..de1b87e 100644
--- a/linuxnamespaces/syscalls.py
+++ b/linuxnamespaces/syscalls.py
@@ -224,6 +224,9 @@ class MountFlags(enum.IntFlag):
parts: list[str] = []
remain = self
for val, text in MountFlags.__flagvals:
+ # Older mypy think MountFlags.__flagvals and thus text was of type
+ # MountFlags.
+ assert isinstance(text, str)
if remain & val == val:
parts.insert(0, text)
remain &= ~val