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.

1 files changed, 5 insertions, 5 deletions

diff --git a/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala b/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
index ffc45b21ea..883fd31dbc 100644
--- a/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
+++ b/src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
@@ -205,11 +205,11 @@ self =>
     override def newScanner() = new UnitScanner(unit, patches)
 
     override def warning(offset: Offset, msg: String) {
-      unit.warning(o2p(offset), msg)
+      reporter.warning(o2p(offset), msg)
     }
 
     override def deprecationWarning(offset: Offset, msg: String) {
-      unit.deprecationWarning(o2p(offset), msg)
+      currentRun.reporting.deprecationWarning(o2p(offset), msg)
     }
 
     private var smartParsing = false
@@ -224,17 +224,17 @@ self =>
     val syntaxErrors = new ListBuffer[(Int, String)]
     def showSyntaxErrors() =
       for ((offset, msg) <- syntaxErrors)
-        unit.error(o2p(offset), msg)
+        reporter.error(o2p(offset), msg)
 
     override def syntaxError(offset: Offset, msg: String) {
       if (smartParsing) syntaxErrors += ((offset, msg))
-      else unit.error(o2p(offset), msg)
+      else reporter.error(o2p(offset), msg)
     }
 
     override def incompleteInputError(msg: String) {
       val offset = source.content.length - 1
       if (smartParsing) syntaxErrors += ((offset, msg))
-      else unit.incompleteInputError(o2p(offset), msg)
+      else currentRun.reporting.incompleteInputError(o2p(offset), msg)
     }
 
     /** parse unit. If there are inbalanced braces,