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http://openjdk.java.net/jeps/220 changes the layout of the
JDK to encapsulate the provided libraries with the new module
system.
This commit modifies the compiler's classpath implementation
to scan the new location of these, the `jrt://` virtual filesystem.
This might need to be adjusted once we provide a means for
users to specify the subset of modules that they want to
depend on, but for now reclaims the ground we lost.
```
⚡ (java_use 9-ea; qscala)
Welcome to Scala 2.12.0-20160908-223617-7e4ebda (Java HotSpot(TM) 64-Bit Server VM, Java 9-ea).
Type in expressions for evaluation. Or try :help.
scala> import StackWalker._, java.util.stream._, scala.collection.JavaConverters._
import StackWalker._
import java.util.stream._
import scala.collection.JavaConverters._
scala> (() => StackWalker.getInstance(java.util.EnumSet.of(Option.RETAIN_CLASS_REFERENCE)).walk[Seq[String]]((s: java.util.stream.Stream[StackFrame]) => s.iterator.asScala.take(3).map(_.toString).toList)).apply().mkString("\n")
res0: String =
.$anonfun$res0$1(<console>:21)
.<init>(<console>:21)
.<clinit>(<console>)
scala>
```
I've marked the new class, `NioFile` as `private[scala]` to justify
the forward compatibility whitelist entry.
In principle we could use NioFile more widely rather than `PlainFile`
I tried this out in https://github.com/retronym/scala/commit/b2d0a17a
which passed CI. But to be conservative, I'm not submitting that change
at this point.
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- Language imports are preceding other imports
- Deleted empty file: InlineErasure
- Removed some unused private[parallel] methods in
scala/collection/parallel/package.scala
This removes hundreds of warnings when compiling with
"-Xlint -Ywarn-dead-code -Ywarn-unused -Ywarn-unused-import".
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Confusing, now-it-happens now-it-doesn't mysteries lurk
in the darkness. When scala packages are declared like this:
package scala.collection.mutable
Then paths relative to scala can easily be broken via the unlucky
presence of an empty (or nonempty) directory. Example:
// a.scala
package scala.foo
class Bar { new util.Random }
% scalac ./a.scala
% mkdir util
% scalac ./a.scala
./a.scala:4: error: type Random is not a member of package util
new util.Random
^
one error found
There are two ways to play defense against this:
- don't use relative paths; okay sometimes, less so others
- don't "opt out" of the scala package
This commit mostly pursues the latter, with occasional doses
of the former.
I created a scratch directory containing these empty directories:
actors annotation ant api asm beans cmd collection compat
concurrent control convert docutil dtd duration event factory
forkjoin generic hashing immutable impl include internal io
logging macros man1 matching math meta model mutable nsc parallel
parsing partest persistent process pull ref reflect reify remote
runtime scalap scheduler script swing sys text threadpool tools
transform unchecked util xml
I stopped when I could compile the main src directories
even with all those empties on my classpath.
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If we just established that the given path is a File or a Directory,
we can assume it continues to exist.
Before
----------------------------------
File.isFile calls : 7620
File.isDirectory calls : 2319
File.exists calls : 5770
After
----------------------------------
File.isFile calls : 7620
File.isDirectory calls : 2319
File.exists calls : 345
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Mostly hailing from a long-ago day when I imagined I was
writing a general purpose library. We dodged that bullet.
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This reverts commit 951fc3a486.
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I want to get this commit into the history because
the tests pass here, which demonstrates that every commented
out method is not only unnecessary internally but has zero
test coverage. Since I know (based on the occasional source
code comment, or more often based on knowing something about
other source bases) that some of these can't be removed
without breaking other things, I want to at least record
a snapshot of the identities of all these unused and
untested methods.
This commit will be reverted; then there will be another
commit which removes the subset of these methods which I
believe to be removable. The remainder are in great need of
tests which exercise the interfaces upon which other
repositories depend.
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* migrates scala.tools.nsc.io portions into scala.reflect.io
* marks all classes in scala.reflect.io experimental/internal
* rewires src/reflect to use new io locations
* creates forwarders in scala.tools.nsci.io package object.
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