templater: introduce wrapper for smartset (API) I want to add a template function which takes a revset as an argument: {somefunc(..., revset(...))} ^^^^^^^^^^^ evaluates to a revslist This wrapper will provide a method to get an underlying smartset. It should also be good for performance since count(revset(...)) will no longer have to fully consume the smartset for example, but that isn't the point of this change.

setup: build C extensions with -Werror=declaration-after-statement MSVC 2008 still needs declarations at the top of the scope. I added it to the 3rd party code too in case somebody vendors a new version with a problem- they'll get an early warning. Clang seems to ignore this (at least on 10.14 with Xcode 10), and gcc 7.4 will error out as desired on Ubuntu 18.04. Thanks to Yuya for remembering the name of the option. Differential Revision: https://phab.mercurial-scm.org/D8318

merge with stable

osutil: move declaration to top of the scope Otherwise the build would fail with -Werror=declaration-after-statement.

phabricator: remove *-argument from _getdrevs() It can't take more than one specs arguments per len(*specs).

revset: leverage internal _rev() function to implement rev() Now 'rev(n)' is identical to 'present(_rev(n))'.