Add a content keyword to file_test, `[[@0xAB]]`, that expands to the
code unit 0xAB, and use that instead of putting raw malformed code units
in test files.
Instead of printing the raw input bytes in snippets in diagnostics,
replace non-printable characters with <AB> in the output, being careful
to still compute the location of the caret and underscore properly.
* `\x` escapes are not permitted in character literals
* ASCII control characters (U+0000 .. U+001F) are not permitted in
character literals unless specified with escape sequences.
This tells Github to detect files having the extension .def as C++
files, which ensures that these files get syntax highlighted prpperly.
I'm not sure whether more files like these are present throughout the
repo. FWIW, it can also be configured to do other things, such as detect
generated, vendored files and exclude these from the Github stats.
See
https://github.com/github-linguist/linguist/blob/master/docs/overrides.md.
Richard Smith
Brymer Meneses