Warn about locally identifiable init order issues.

This warns about a subset of initialization order issues which
can easily be identified by inspection, such as

  val x = y
  val y = 5

The likelihood of this formulation being intentional is miniscule.

1 files changed, 23 insertions, 0 deletions

diff --git a/test/files/neg/constructor-init-order.scala b/test/files/neg/constructor-init-order.scala
new file mode 100644
index 0000000000..fe8fec87ad
--- /dev/null
+++ b/test/files/neg/constructor-init-order.scala
@@ -0,0 +1,23 @@
+trait Foo0 {
+  val quux1: String
+  val quux2 = quux1  // warning here is "future work"
+}
+
+class Foo1 extends Foo0 {
+  val bar1         = baz     // warn
+  val bar2         = lazybaz // no warn
+  val bar3         = defbaz  // no warn
+  val baz          = "oops"
+  lazy val lazybaz = "ok"
+  def defbaz       = "ok"
+  val quux1        = "oops"
+}
+
+class Foo2 {
+  var bar1         = baz     // warn
+  var bar2         = lazybaz // no warn
+  var bar3         = defbaz  // no warn
+  var baz          = "oops"
+  lazy val lazybaz = "ok"
+  def defbaz       = "ok"
+}