Proliferating the number of debugging modes bec...

Proliferating the number of debugging modes because it's still way
too hard to see what's going on in there. Until we get hubert's type
debugger with its whiz-bang whizbanginess, we'll have to struggle along
with somewhat prettier ascii. This introduces:

  -Yinfer-debug

which tries to print in readable fashion what is happening in the
worlds of inference and implicit search. It should be made a bit more
complementary and less overlappy with -Ytyper-debug. No review.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/compiler/scala/tools/nsc/Global.scala b/src/compiler/scala/tools/nsc/Global.scala
index 0f5be1791b..c777652706 100644
--- a/src/compiler/scala/tools/nsc/Global.scala
+++ b/src/compiler/scala/tools/nsc/Global.scala
@@ -247,7 +247,6 @@ class Global(var currentSettings: Settings, var reporter: Reporter) extends Symb
     // debugging
     def checkPhase = wasActive(settings.check)
     def logPhase   = isActive(settings.log)
-    def typerDebug = settings.Ytyperdebug.value
     def writeICode = settings.writeICode.value
 
     // showing/printing things
@@ -270,9 +269,10 @@ class Global(var currentSettings: Settings, var reporter: Reporter) extends Symb
     def profileClass = settings.YprofileClass.value
     def profileMem   = settings.YprofileMem.value
 
-    // XXX: short term, but I can't bear to add another option.
-    // scalac -Dscala.timings will make this true.
+    // shortish-term property based options
     def timings       = sys.props contains "scala.timings"
+    def inferDebug    = (sys.props contains "scalac.debug.infer") || settings.Yinferdebug.value
+    def typerDebug    = (sys.props contains "scalac.debug.typer") || settings.Ytyperdebug.value
   }
 
   // True if -Xscript has been set, indicating a script run.
@@ -350,6 +350,7 @@ class Global(var currentSettings: Settings, var reporter: Reporter) extends Symb
 
   /** Switch to turn on detailed type logs */
   var printTypings = opt.typerDebug
+  var printInfers = opt.inferDebug
 
   // phaseName = "parser"
   object syntaxAnalyzer extends {