run-tests: fix broken regular expression The regular expression in use passed tests because the test repo only has single-digit changesets present. When I tried to use this for real today, it broke, because the regular expression would only match a single digit. https://xkcd.com/1171/, or something like that.

test: don't rely on __del__ in test-devel-warnings.t Whatever the future of __del__ in Mercurial is, that devel-warning test is not about testing the automatic transaction rollback and we should explicitly call release. This change make this tests pass with pypy, as pypy try less hard to call __del__ at program exit.

dispatch: split out warning message generation to separate function Allow for patching warning message generation, or for patching out the ui.log / ui.warn behaviour (but still generate the warning message).