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Closing the REPL with Ctrl+D does not issue a newline, so the user's
prompt displays on the same line as the `scala>` prompt. This is bad.
We now force a newline before closing the interpreter, and display
`:quit` while we're at it so that people know how to exit the REPL
(since `exit` doesn't exist anymore).
The tricky part was to only add a newline when the console is
interrupted, and *not* when it is closed by a command (like `:quit`),
since commands are processed after their text (including newline) has
been sent to the console.
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The 990b3c7 made `scala.throws` annotation polymorphic but forgot to
adapt compiler code that synthesizes it, e.g. when parsing class files.
The consequence was that we would get non-deterministically either
`scala.throws` or `scala.throws[T]` as a type for synthesized annotation.
The reason is that `Symbol.addAnnotation` would call `tpe` method which
does not initialization of symbol so type parameters list would not be
determined correctly. Only if info of that symbol was forced for other
reason we would get `scala.throws[T]`. That non-deterministic behavior
was observed in sbt's incremental compiler.
Another problem we have is that Scala allows polymorphic exceptions
so in ClassfileParser we could synthesize `@throws` annotation with
wrong (polymorphic) type applied. In such case the best we can do
is to convert such type to monomorphic one by introducing existentials.
Here's list of changes this commit introduces:
* The `Symbol.addAnnotation` that takes symbol as argument asserts
that the type represented by that symbol is monomorphic (disabled
due to cycles; see comments in the code)
* Introduce `Symbol.addAnnotation` overload that allows us to pass
an applied type
* Change all places where polymorphic annotations are synthesized
to pass an applied type
* Handle polymorphic exception types in
`ClassfileParser.parseExceptions`
Fixes SI-7009.
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The next commit fixes the problem itself and it's easier to see
in diff what's being fixed exactly.
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