parsers.c: parse_manifest: fixing refcount of flags
When flags was DECREF'ed, scope was referencing to the outer variable,
outside of the block.
It was in fact always NULL: the real Python object was never decref'ed.
#!/bin/sh
hg init
echo a > a
hg add
hg ci -m1
# set mtime of a into the future
touch -t 202101011200 a
# status must not set a's entry to unset (issue1790)
hg status
hg debugstate