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The backend lives in the scalac fork at
https://github.com/lampepfl/scala/tree/sharing-backend. Before this
commit, the scala-compiler built from this fork was a dependency of
Scala just to get this backend. This made it much more cumbersome to
test changes to the backend and also forced us to depend on Scala 2.11.5
since that is the version of scalac that the forked backend is based on.
This commit changes this by adding a git submodule in the
`scala-backend` directory that points to the scalac fork. We do not
compile the whole submodule, instead we add the subset of files we need
to the dotty-compiler project in the sbt build. See backend.md for more
information (online at
http://dotty.epfl.ch/docs/contributing/backend.html) once this commit is
merged.
The most important thing to note is that whenever you clone dotty you
should do `git clone --recursive` to also clone the submodule. If you
already have a cloned dotty you'll need to do:
git submodule update --init
You will need to repeat this command anytime you update dotty and the
backend has been updated, otherwise the content of `scala-backend` will
be stale.
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MethodTypes have paramTypes whereas PolyTypes have paramBounds.
We now harmonize by alling both paramInfos, and parameterizing
types that will become common to both.
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Typer#ensureReported's comment outlines an example where errors
could go unreported, resulting in error trees after typer without
any reported error messages. This commit makes sure that at least
one error is reported if a tree node has an error type.
Fixes #1802.
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Drop explicit types for local implicit vals of type Context
and Position. Exercises the functionality and shortens the code.
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