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Conflicts:
src/interactive/scala/tools/nsc/interactive/CompilerControl.scala
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Calling position factories rather than instantiating these
particular classes. Not calling deprecated methods. Added a few
position combinator methods.
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The only usages of scala.tools.nsc.io.{Lexer,Pickler,PrettyWriter,
Replayer} can be found in scala.tools.nsc.interactive.
Let's move those files closer to their dependencies.
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`Symbol::isStable` is now independent of `Symbol::hasVolatileType`,
so that we can allow stable identifiers that are volatile in ident patterns.
This split is validated by SI-6815 and the old logic in RefChecks,
which seems to assume this independence, and thus I don't think ever worked:
```
if (member.isStable && !otherTp.isVolatile) {
if (memberTp.isVolatile)
overrideError("has a volatile type; cannot override a member with non-volatile type")
```
Introduces `admitsTypeSelection` and `isStableIdentifierPattern` in treeInfo,
and uses them instead of duplicating that logic all over the place.
Since volatility only matters in the context of type application,
`isStableIdentifierPattern` is used to check patterns (resulting in `==` checks)
and imports.
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As with the preceding commit, this has build-internal
effects only.
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