typecheck(q"class C") no longer crashes

MemberDefs alone can't be typechecked as is, because namer only names
contents of PackageDefs, Templates and Blocks. And, if not named, a tree
can't be typed.

This commit solves this problem by wrapping typecheckees in a trivial block
and then unwrapping the result when it returns back from the typechecker.

2 files changed, 22 insertions, 0 deletions

diff --git a/test/files/run/typecheck/Macros_1.scala b/test/files/run/typecheck/Macros_1.scala
new file mode 100644
index 0000000000..ee1c8da763
--- /dev/null
+++ b/test/files/run/typecheck/Macros_1.scala
@@ -0,0 +1,12 @@
+import scala.reflect.macros.whitebox._
+import scala.language.experimental.macros
+
+object Macros {
+  def impl(c: Context) = {
+    import c.universe._
+    c.typecheck(q"class C")
+    q"()"
+  }
+
+  def foo: Any = macro impl
+}
\ No newline at end of file
diff --git a/test/files/run/typecheck/Test_2.scala b/test/files/run/typecheck/Test_2.scala
new file mode 100644
index 0000000000..01bf5198cc
--- /dev/null
+++ b/test/files/run/typecheck/Test_2.scala
@@ -0,0 +1,10 @@
+import scala.reflect.runtime.universe._
+import scala.reflect.runtime.{currentMirror => cm}
+import scala.tools.reflect.ToolBox
+
+object Test extends App {
+  Macros.foo
+
+  val tb = cm.mkToolBox()
+  tb.typecheck(q"class C")
+}
\ No newline at end of file