This commits adds a new annotation OptionalExpectation to the standard
library, which is experimental. To enable its usage, either pass
'-Xuse-experimental=kotlin.ExperimentalMultiplatform' as a compiler
argument, or '-Xuse-experimental=kotlin.Experimental' and also annotate
each usage with `@UseExperimental(ExperimentalMultiplatform::class)`
#KT-18882 Fixed
It's no longer needed for checking binary compatibility.
Clean build of these libraries is no longer required too.
Cleanup build.gradle of binary-compatibility-validator.
If a declaration is annotated both with SinceKotlin and WasExperimental
and the SinceKotlin version makes it inaccessible, the experimental
checker must regard it as experimental, with markers specified in the
WasExperimental annotation arguments. So only errors/warnings about the
experimentality are going to be reported in this case, and no error that
the declaration is unavailable because of a low API version
Usages of declarations annotated with WasExperimental are allowed even
if the API version requirement is not satisfied, provided that the
opt-in to all mentioned markers is given. This is needed for smooth
graduation of API in kotlin-stdlib
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
See https://github.com/Kotlin/KEEP/issues/95#issuecomment-383889404
Drop Experimental.changesMayBreak, Experimental.Impact, the concept of
signature/body usage, same module exemption. Make the majority of tests
single-module because there is now no difference in the checker between
usages from the same module or from another module
Copy everything from kotlin.coroutines.experimental to
kotlin.coroutines. The latter is separate source set to be packed into
separate kotlin-stdlib-coroutines.jar
#KT-23362
Mikhael Bogdanov