Fix a bug where @import url("...") would crash in plain CSS files.
Improve consistency of how warnings are emitted by different parts of the
compiler. This should result in minimal user-visible changes, but different
types of warnings should now respond more reliably to flags like --quiet,
--verbose, and --silence-deprecation.
@import is now officially deprecated, as are global built-in functions that
are available within built-in modules. See the Sass blog post for more
details on the deprecation process.
Embedded Host
Fix an error that would sometimes occur when deprecation warnings were
emitted when using a custom importer with the legacy API.
