Should we get this on stable instead of default ?

+ error[E0670]: async fn` is not permitted in the 2015 edition`

diff --git a/mercurial/manifest.py b/mercurial/manifest.py

• a/mercurial/manifest.py

+++ b/mercurial/manifest.py
@@ -57,7 +57,10 @@

    raise ValueError(b'Manifest lines not in sorted order.')
prev = l
f, n = l.split(b'\0')

• if len(n) > 40:

+ nl = len(n)
+ if 64 < nl:
+ yield f, bin(n[:64]), n[64:]
+ if 40 < nl < 45:

    yield f, bin(n[:40]), n[40:]
else:
    yield f, bin(n), b''

Because you expect to add an async block or something that will make the diff harder to read, I suppose?

+ {
+ match msg {

Not sure I understand the extra bracket here.