Added "runsAfter" requirements.

Author: odersky

src/dotty/tools/dotc/transform/Erasure.scala

@@ -28,7 +28,7 @@ class Erasure extends Phase with DenotTransformer {
   override def name: String = "erasure"
 
   /** List of names of phases that should precede this phase */
-  override def runsAfter: Set[String] = Set("typeTestsCasts", "intercepted", "splitter")
+  override def runsAfter: Set[String] = Set("typeTestsCasts", "intercepted", "splitter", "nullarify")
 
   def transform(ref: SingleDenotation)(implicit ctx: Context): SingleDenotation = ref match {
     case ref: SymDenotation =>

src/dotty/tools/dotc/transform/LazyVals.scala

@@ -68,7 +68,7 @@ class LazyValTranformContext {
     override def runsAfterGroupsOf: Set[String] = Set("lazyValsModules")
     /** List of names of phases that should have finished their processing of all compilation units
       * before this phase starts */
-    override def runsAfter: Set[String] = Set("lazyValsModules")
+    override def runsAfter: Set[String] = Set("lazyValsModules") // @darkdimius why repeat; it's already in runsAfterGroupsOf?
 
     /** List of names of phases that should have finished processing of tree
       * before this phase starts processing same tree */

src/dotty/tools/dotc/transform/Nullarify.scala

@@ -39,6 +39,10 @@ class Nullarify extends TreeTransform with InfoTransformer {
 
   override def name: String = "nullarify"
 
+  override def runsAfterGroupsOf: Set[String] = Set("splitter")
+    // assumes idents and selects have symbols; interferes with splitter distribution
+    // that's why it's "after group".
+
   override def transformApply(tree: Apply)(implicit ctx: Context, info: TransformerInfo): Tree =
     ctx.traceIndented(s"transforming ${tree.show} at phase ${ctx.phase}", show = true) {