Find all the usages of `--enable-experimental-feature` or
`--enable-upcoming-feature` in the tests and replace some of the
`REQUIRES: asserts` to use `REQUIRES: swift-feature-Foo` instead, which
should correctly apply to depending on the asserts/noasserts mode of the
toolchain for each feature.
Remove some comments that talked about enabling asserts since they don't
apply anymore (but I might had miss some).
All this was done with an automated script, so some formatting weirdness
might happen, but I hope I fixed most of those.
There might be some tests that were `REQUIRES: asserts` that might run
in `noasserts` toolchains now. This will normally be because their
feature went from experimental to upcoming/base and the tests were not
updated.
During the lifecycle of a feature, it may start as an experimental feature and
then graduate to become an upcoming feature. To preserve compatibility with
projects that adopted the feature when it was experimental,
`-enable-experimental-feature` ought to be able to enable upcoming features,
too.
Since projects may use `-enable-experimental-feature` for compatibility with an
older toolchain that does not have the feature as an upcoming feature, there is
no warning when the flag is used to enable an upcoming feature.
Note that if the semantics of a feature change when it graduates from
experimental to upcoming, then the feature must be renamed so that projects
using the experimental feature have an opportunity opt-in to the new semantics
of the upcoming feature.
Resolves rdar://134276783.
The feature InternalImportsByDefault makes imports default to internal instead
of public. Applying the Swift 6 behavior of SE-0409 in Swift 5.
Let's use only that flag to track the Swift 6 behavior as well instead
of separately checking for the language version.
While use of access-level in imports is still gated by a flag for normal
source code, accept it in swiftinterfaces without the flag. This will
make it easier for older compilers to read newer swiftinterfaces created
by a future compiler where that restriction is lifted.
rdar://115455383
