Incorporate pull request feedback

  - remove unneeded `setType(NoType)`, which was leftover from my
    first attempts to find this bug.
  - fix typo in error message
  - optimize imports

(cherry picked from commit 5c6ea29)

Author: retronym

src/main/scala/scala/async/internal/AsyncAnalysis.scala

@@ -61,7 +61,7 @@ trait AsyncAnalysis {
         case Return(_)                                        =>
           abort(tree.pos, "return is illegal within a async block")
         case DefDef(mods, _, _, _, _, _) if mods.hasFlag(Flag.LAZY) && containsAwait =>
-          reportUnsupportedAwait(tree, "lazy val initalizer")
+          reportUnsupportedAwait(tree, "lazy val initializer")
         case CaseDef(_, guard, _) if guard exists isAwait     =>
           // TODO lift this restriction
           reportUnsupportedAwait(tree, "pattern guard")

src/main/scala/scala/async/internal/AsyncTransform.scala

@@ -52,7 +52,7 @@ trait AsyncTransform {
       }
 
       val tryToUnit = appliedType(definitions.FunctionClass(1), futureSystemOps.tryType[Any], typeOf[Unit])
-      val template = Template(List(tryToUnit, typeOf[() => Unit]).map(TypeTree(_)), emptyValDef, body).setType(NoType)
+      val template = Template(List(tryToUnit, typeOf[() => Unit]).map(TypeTree(_)), emptyValDef, body)
 
       val t = ClassDef(NoMods, name.stateMachineT, Nil, template)
       typecheckClassDef(t)

src/test/scala/scala/async/neg/NakedAwait.scala

@@ -163,7 +163,7 @@ class NakedAwait {
 
   @Test
   def lazyValIllegal() {
-    expectError("await must not be used under a lazy val initalizer") {
+    expectError("await must not be used under a lazy val initializer") {
       """
         | import _root_.scala.async.internal.AsyncId._
         | def foo(): Any = async { val x = { lazy val y = await(0); y } }

src/test/scala/scala/async/run/lazyval/LazyValSpec.scala

@@ -6,11 +6,6 @@ package scala.async
 package run
 package lazyval
 
-import scala.async.run.noawait
-
-import scala.async.internal.AsyncId
-import scala.async.internal.AsyncId
-import AsyncId._
 import org.junit.Test
 import scala.async.internal.AsyncId._