Are we expanding ainline macro while typing the program?

This will be true when the macro is used in a transparent inline.

Expose macro-specific settings as a list of strings. Settings can be set from command line with help of -Xmacro-settings options.

These will be used to expand any transparent macros or any non-transparent macro that is forced to expand while expanding the transparent macro. Non-transparent macros are not guaranteed to be expanded with the same set of settings.