From ecda1010416305e5d5cbf9ba0c7f90ddee8a9737 Mon Sep 17 00:00:00 2001
From: Adriaan Moors <adriaan.moors@typesafe.com>
Date: Thu, 10 Jul 2014 15:30:28 +0200
Subject: Make more explicit that TypeError is being thrown.

`typer.TyperErrorGen.MacroCantExpandIncompatibleMacrosError`
throws because the type checker it uses is at `NoContext`,
which throws by default... This default is bad and is going to change,
so make this code independent of that future sanity.

TODO: don't use mutable state to determine position for the error
---
 .../tools/nsc/typechecker/ContextErrors.scala      | 24 ++++++++++++----------
 .../scala/tools/nsc/typechecker/Macros.scala       |  3 ++-
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
index 5c31685bcd..028ac46058 100644
--- a/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/ContextErrors.scala
@@ -119,6 +119,19 @@ trait ContextErrors {
 
   import ErrorUtils._
 
+  private def MacroIncompatibleEngineError(friendlyMessage: String, internalMessage: String) = {
+    def debugDiagnostic = s"(internal diagnostic: $internalMessage)"
+    val message = if (macroDebugLite || macroDebugVerbose) s"$friendlyMessage $debugDiagnostic" else friendlyMessage
+    // TODO: clean this up! (This is a more explicit version of what the code use to do, to reveal the issue.)
+    throw new TypeError(analyzer.lastTreeToTyper.pos, message)
+  }
+
+  def MacroCantExpand210xMacrosError(internalMessage: String) =
+    MacroIncompatibleEngineError("can't expand macros compiled by previous versions of Scala", internalMessage)
+
+  def MacroCantExpandIncompatibleMacrosError(internalMessage: String) =
+    MacroIncompatibleEngineError("macro cannot be expanded, because it was compiled by an incompatible macro engine", internalMessage)
+
   trait TyperContextErrors {
     self: Typer =>
 
@@ -729,17 +742,6 @@ trait ContextErrors {
         NormalTypeError(expandee, "too many argument lists for " + fun)
       }
 
-      private def MacroIncompatibleEngineError(friendlyMessage: String, internalMessage: String) = {
-        def debugDiagnostic = s"(internal diagnostic: $internalMessage)"
-        val message = if (macroDebugLite || macroDebugVerbose) s"$friendlyMessage $debugDiagnostic" else friendlyMessage
-        issueNormalTypeError(lastTreeToTyper, message)
-      }
-
-      def MacroCantExpand210xMacrosError(internalMessage: String) =
-        MacroIncompatibleEngineError("can't expand macros compiled by previous versions of Scala", internalMessage)
-
-      def MacroCantExpandIncompatibleMacrosError(internalMessage: String) =
-        MacroIncompatibleEngineError("macro cannot be expanded, because it was compiled by an incompatible macro engine", internalMessage)
 
       case object MacroExpansionException extends Exception with scala.util.control.ControlThrowable
 
diff --git a/src/compiler/scala/tools/nsc/typechecker/Macros.scala b/src/compiler/scala/tools/nsc/typechecker/Macros.scala
index 9c22688581..66152a6ac2 100644
--- a/src/compiler/scala/tools/nsc/typechecker/Macros.scala
+++ b/src/compiler/scala/tools/nsc/typechecker/Macros.scala
@@ -226,7 +226,8 @@ trait Macros extends MacroRuntimes with Traces with Helpers {
       val Apply(_, pickledPayload) = wrapped
       val payload = pickledPayload.map{ case Assign(k, v) => (unpickleAtom(k), unpickleAtom(v)) }.toMap
 
-      import typer.TyperErrorGen._
+      // TODO: refactor error handling: fail always throws a TypeError,
+      // and uses global state (analyzer.lastTreeToTyper) to determine the position for the error
       def fail(msg: String) = MacroCantExpandIncompatibleMacrosError(msg)
       def unpickle[T](field: String, clazz: Class[T]): T = {
         def failField(msg: String) = fail(s"$field $msg")
-- 
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