Rip out reporting indirection from CompilationUnit

Inline the forwarders from CompilationUnit, which should not affect behavior.
Since all forwarders lead to global.reporter, don't first navigate
to a compilation unit, only to then forward back to global.reporter.

The cleanup in the previous commits revealed a ton of confusion
regarding how to report an error.

This was a mechanical search/replace, which has low potential for messing
things up, since the list of available methods are disjoint between
`reporter` and `currentRun.reporting`. The changes involving `typer.context`
were done previously.

Essentially, there are three ways to report:
  - via typer.context, so that reporting can be silenced (buffered)
  - via global.currentRun.reporting, which summarizes (e.g., deprecation)
  - via global.reporter, which is (mostly) stateless and straightforward.

Ideally, these should all just go through `global.currentRun.reporting`,
with the typing context changing that reporter to buffer where necessary.

After the refactor, these are the ways in which we report (outside of typer):
  - reporter.comment
  - reporter.echo
  - reporter.error
  - reporter.warning
  - currentRun.reporting.deprecationWarning
  - currentRun.reporting.incompleteHandled
  - currentRun.reporting.incompleteInputError
  - currentRun.reporting.inlinerWarning
  - currentRun.reporting.uncheckedWarning

Before:
  - c.cunit.error
  - c.enclosingUnit.deprecationWarning
  - context.unit.error
  - context.unit.warning
  - csymCompUnit.warning
  - cunit.error
  - cunit.warning
  - currentClass.cunit.warning
  - currentIClazz.cunit.inlinerWarning
  - currentRun.currentUnit.error
  - currentRun.reporting
  - currentUnit.deprecationWarning
  - currentUnit.error
  - currentUnit.warning
  - getContext.unit.warning
  - getCurrentCUnit.error
  - global.currentUnit.uncheckedWarning
  - global.currentUnit.warning
  - global.reporter
  - icls.cunit.warning
  - item.cunit.warning
  - reporter.comment
  - reporter.echo
  - reporter.error
  - reporter.warning
  - reporting.deprecationWarning
  - reporting.incompleteHandled
  - reporting.incompleteInputError
  - reporting.inlinerWarning
  - reporting.uncheckedWarning
  - typer.context.unit.warning
  - unit.deprecationWarning
  - unit.echo
  - unit.error
  - unit.incompleteHandled
  - unit.incompleteInputError
  - unit.uncheckedWarning
  - unit.warning
  - v1.cunit.warning

All these methods ended up calling a method on `global.reporter`
or on `global.currentRun.reporting` (their interfaces are disjoint).

Also clean up `TypeDiagnostics`: inline nearly-single-use private methods.

2 files changed, 6 insertions, 6 deletions

diff --git a/src/compiler/scala/tools/nsc/javac/JavaParsers.scala b/src/compiler/scala/tools/nsc/javac/JavaParsers.scala
index a61ad392ee..37b00aa9a3 100644
--- a/src/compiler/scala/tools/nsc/javac/JavaParsers.scala
+++ b/src/compiler/scala/tools/nsc/javac/JavaParsers.scala
@@ -26,10 +26,10 @@ trait JavaParsers extends ast.parser.ParsersCommon with JavaScanners {
     def freshName(prefix: String): Name = freshTermName(prefix)
     def freshTermName(prefix: String): TermName = unit.freshTermName(prefix)
     def freshTypeName(prefix: String): TypeName = unit.freshTypeName(prefix)
-    def deprecationWarning(off: Int, msg: String) = unit.deprecationWarning(off, msg)
+    def deprecationWarning(off: Int, msg: String) = currentRun.reporting.deprecationWarning(off, msg)
     implicit def i2p(offset : Int) : Position = Position.offset(unit.source, offset)
-    def warning(pos : Int, msg : String) : Unit = unit.warning(pos, msg)
-    def syntaxError(pos: Int, msg: String) : Unit = unit.error(pos, msg)
+    def warning(pos : Int, msg : String) : Unit = reporter.warning(pos, msg)
+    def syntaxError(pos: Int, msg: String) : Unit = reporter.error(pos, msg)
   }
 
   abstract class JavaParser extends ParserCommon {
diff --git a/src/compiler/scala/tools/nsc/javac/JavaScanners.scala b/src/compiler/scala/tools/nsc/javac/JavaScanners.scala
index c5401219dd..bddcf6567c 100644
--- a/src/compiler/scala/tools/nsc/javac/JavaScanners.scala
+++ b/src/compiler/scala/tools/nsc/javac/JavaScanners.scala
@@ -860,9 +860,9 @@ trait JavaScanners extends ast.parser.ScannersCommon {
   class JavaUnitScanner(unit: CompilationUnit) extends JavaScanner {
     in = new JavaCharArrayReader(unit.source.content, !settings.nouescape.value, syntaxError)
     init()
-    def error  (pos: Int, msg: String) = unit.  error(pos, msg)
-    def incompleteInputError(pos: Int, msg: String) = unit.incompleteInputError(pos, msg)
-    def deprecationWarning(pos: Int, msg: String) = unit.deprecationWarning(pos, msg)
+    def error  (pos: Int, msg: String) = reporter.error(pos, msg)
+    def incompleteInputError(pos: Int, msg: String) = currentRun.reporting.incompleteInputError(pos, msg)
+    def deprecationWarning(pos: Int, msg: String) = currentRun.reporting.deprecationWarning(pos, msg)
     implicit def g2p(pos: Int): Position = Position.offset(unit.source, pos)
   }
 }