introduces unapply macros for internal use

Adds a macro hook into the unapply part of `doTypedApply`, provides
`macroExpandUnapply` in the macro engine and applies a couple of minor
refactorings along the way (renames the ugly `macroExpand1` into
oblivion, changes the ctor of `Fingerprint` to be private and upgrades
`MacroRole` from a string to a value class).

Unapply macros haven't been approved for inclusion in 2.11.0, however
they are necessary for pattern-matching quasiquotes. Therefore I'm only
allowing them to expand for QuasiquoteClass_api_unapply.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
index a3ab948171..f2a77b4333 100644
--- a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
@@ -741,7 +741,7 @@ trait ContextErrors {
           try {
             // [Eugene] is there a better way?
             // [Paul] See Exceptional.scala and Origins.scala.
-            val relevancyThreshold = realex.getStackTrace().indexWhere(_.getMethodName endsWith "macroExpand1")
+            val relevancyThreshold = realex.getStackTrace().indexWhere(_.getMethodName endsWith "macroExpandWithRuntime")
             if (relevancyThreshold == -1) None
             else {
               var relevantElements = realex.getStackTrace().take(relevancyThreshold + 1)