tests: show unusual error message for `hg log --style coal`
It turns out that we show the full path when the given style name
matches a subdirectory of `mercurial/templates/`.
Differential Revision: https://phab.mercurial-scm.org/D8803
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2