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Use -Ystdlib to add Scala 2 lib TASTY to scalac (internal only)
This flag only works on the `scala3-bootstrapped/scalac` in the dotty
project. It is intended for internal testing.
Currently it is a bit expensive to compile the Scala 2 library TASTy.
One reason in for this is that we need to use `-Ycheck:all` when
compiling it to make sure that `-Yscala2-stdlib` is working properly.
We only allow `scala3-bootstrapped/scalac` and not `scalac` to have this
dependency for two reasons. First, we do want to be able to compile and
run `scalac` command fast to reduce development testing time. Second, we
do not have a stable enough version of the Scala 2 library TASTy yet.
We also do not enable the Scala 2 library TASTy by default on
`scala3-bootstrapped/scalac` because we still need this command to test
against the current version of the library. Stability is also a concern
for this version of the command.
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