cleanup: polyfill assertRaisesRegex so we can avoid assertRaisesRegexp
The latter is deprecated on Python 3.7 and causes our tests to fail
due to the warning.
Differential Revision: https://phab.mercurial-scm.org/D3375
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2