windows: revlog.lazyparser not always safe to use.
can not use on windows < nt or if win32 api not available.
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing b
this update spans a branch affecting the following files:
b
aborting update spanning branches!
(use 'hg merge' to merge across branches or 'hg update -C' to lose changes)