diff: re-establish linear runtime performance
The previous method with sum() and list() creates a new list object
for every hunk. Then sum() is used to flatten out this sequence of
lists. The sum() function is not "lazy", but creates a new list object
for every "+" operation and so this code had quadratic runtime behaviour.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.