Remove NPE when `compileLate` sees sources during initialization.

When a symbol needed in Definitions is loaded, it may be that the corresponding source is newer than
the classfile. That will send it to `compileLate`, but no phase is yet set. We simply add it to the 
compilation pipeline and continue gracefully.

1 files changed, 6 insertions, 5 deletions

diff --git a/src/compiler/scala/tools/nsc/Global.scala b/src/compiler/scala/tools/nsc/Global.scala
index 787c9c7f57..a701e41153 100644
--- a/src/compiler/scala/tools/nsc/Global.scala
+++ b/src/compiler/scala/tools/nsc/Global.scala
@@ -1667,13 +1667,14 @@ class Global(var currentSettings: Settings, var reporter: Reporter)
     /** Compile abstract file until `globalPhase`, but at least to phase "namer".
      */
     def compileLate(unit: CompilationUnit) {
-      val maxId = math.max(globalPhase.id, typerPhase.id)
       addUnit(unit)
 
-      firstPhase.iterator takeWhile (_.id < maxId) foreach (ph =>
-        atPhase(ph)(ph.asInstanceOf[GlobalPhase] applyPhase unit)
-      )
-      refreshProgress
+      if (firstPhase ne null) { // we might get here during initialization, is a source is newer than the binary
+        val maxId = math.max(globalPhase.id, typerPhase.id)
+        firstPhase.iterator takeWhile (_.id < maxId) foreach (ph =>
+          atPhase(ph)(ph.asInstanceOf[GlobalPhase] applyPhase unit))
+        refreshProgress
+      }
     }
 
     /** Reset package class to state at typer (not sure what this