This option is not widely used and its implementation relies on a
complicated mechanism of a module-wide metadata, which is not properly
supported in the IDE (see IdeModuleAnnotationsResolver).
#KT-34649 Fixed
Since we're not yet sure of the design of Experimental/UseExperimental,
we're making them "experimental" themselves in some sense, in that the
user is required to provide the magic argument
"-Xuse-experimental=kotlin.Experimental" to be allowed to use either
Experimental or UseExperimental. This is more convenient than the
previous approach of "-language-version 1.3
-Xskip-metadata-version-check" because it's simpler and does not cause
pre-release binaries to be produced
Mikhail Glukhikh