Fix crash in footprint computation

compiler/src/dotty/tools/dotc/transform/init/Objects.scala

@@ -610,6 +610,10 @@ class Objects(using Context @constructorOnly):
             if !visited.contains(value) then
               toVisit += value
 
+          case objRef: ObjectRef =>
+            // Thanks to initialization-time irrelevance, there is no need to
+            // visit the heap regions owned by other global objects.
+
           case value: Value =>
             recur(value)
 

tests/init-global/pos/sconfig-array.scala

@@ -0,0 +1,26 @@
+import java.{lang => jl}
+
+final class ConfigValueType private (val name: String, val ordinal: Int)
+
+object ConfigValueType:
+  final val OBJECT = new ConfigValueType("OBJECT", 0)
+  final val LIST = new ConfigValueType("LIST", 1)
+  final val NUMBER = new ConfigValueType("NUMBER", 2)
+  final val BOOLEAN = new ConfigValueType("BOOLEAN", 3)
+  final val NULL = new ConfigValueType("NULL", 4)
+  final val STRING = new ConfigValueType("STRING", 5)
+
+  final val _values: Array[ConfigValueType] =
+    Array(OBJECT, LIST, NUMBER, BOOLEAN, NULL, STRING)
+
+  def values: Array[ConfigValueType] = _values.clone()
+
+  def valueOf(name: String): ConfigValueType =
+    _values.find(_.name == name).getOrElse {
+      throw new IllegalArgumentException(
+        "No enum const ConfigValueType." + name
+      )
+    }
+
+object Usage:
+  val c = ConfigValueType.valueOf("LIST")