A couple of fixes to compile the 2.13 standard library #5807
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This sometimes lead to cycles when compiling the 2.13 stdlib and shouldn't be necessary anymore (all the tests pass).
- Always rely on -Ynew-collections to change our behavior, attempting to automatically detect which version we're on leads to cycles. - In the new collections, the scala.Serializable class has been replaced by a type alias of java.io.Serializable - The `<:<` class was moved from the Predef object to the scala package.
ghost
assigned 
odersky
approved these changes
Jan 29, 2019
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