SI-7494 Tests for status quo

Exploit SI-6446 fix to move old pending tests for plugins to the
active pool.

Also, nuance the partest runner to allow the compiler to crash
with a FatalError if a check file is present.

Some of the plugin tests make phase assembly throw.

One of the legacy tests was moved back to pending:

There seems to be a race for who shall be deemed truly dependent.

Back to pending for you!

apm@mara:~/projects/snytt/test$ ./partest files/neg/t7494-cyclic-dependency/
Selected 1 tests drawn from specified tests

> starting 1 test in neg
ok 1 - neg/t7494-cyclic-dependency

1/1 passed (elapsed time: 00:00:04)
Test Run PASSED
apm@mara:~/projects/snytt/test$ ./partest files/neg/t7494-cyclic-dependency/
Selected 1 tests drawn from specified tests

> starting 1 test in neg
!! 1 - neg/t7494-cyclic-dependency               [output differs]
> 0/1 passed, 1 failed in neg

>>>>> Transcripts from failed tests >>>>>

> partest files/neg/t7494-cyclic-dependency
% scalac t7494-cyclic-dependency/ThePlugin.scala
% scalac t7494-cyclic-dependency/sample_2.scala
error: Cycle in compiler phase dependencies detected, phase cyclicdependency1 reacted twice!

% diff files/neg/t7494-cyclic-dependency-neg.log files/neg/t7494-cyclic-dependency.check
@@ -1 +1 @@
-error: Cycle in compiler phase dependencies detected, phase cyclicdependency1 reacted twice!
+error: Cycle in compiler phase dependencies detected, phase cyclicdependency2 reacted twice!

0/1 passed, 1 failed (elapsed time: 00:00:04)
Test Run FAILED

4 files changed, 42 insertions, 0 deletions

diff --git a/test/files/neg/t7494-no-options/ploogin_1.scala b/test/files/neg/t7494-no-options/ploogin_1.scala
new file mode 100644
index 0000000000..ed6adfc1cf
--- /dev/null
+++ b/test/files/neg/t7494-no-options/ploogin_1.scala
@@ -0,0 +1,31 @@
+
+package t6446
+
+import scala.tools.nsc.{ Global, Phase }
+import scala.tools.nsc.plugins.{ Plugin, PluginComponent }
+import scala.reflect.io.Path
+import scala.reflect.io.File
+
+/** A test plugin.  */
+class Ploogin(val global: Global) extends Plugin {
+  import global._
+
+  val name = "ploogin"
+  val description = "A sample plugin for testing."
+  val components = List[PluginComponent](TestComponent)
+
+  private object TestComponent extends PluginComponent {
+    val global: Ploogin.this.global.type = Ploogin.this.global
+    //override val runsBefore = List("refchecks")
+    val runsAfter = List("jvm")
+    val phaseName = Ploogin.this.name
+    override def description = "A sample phase that does so many things it's kind of hard to describe briefly."
+    def newPhase(prev: Phase) = new TestPhase(prev)
+    class TestPhase(prev: Phase) extends StdPhase(prev) {
+      override def description = TestComponent.this.description
+      def apply(unit: CompilationUnit) {
+        // kewl kode
+      }
+    }
+  }
+}
diff --git a/test/files/neg/t7494-no-options/sample_2.flags b/test/files/neg/t7494-no-options/sample_2.flags
new file mode 100644
index 0000000000..7f0f7afe48
--- /dev/null
+++ b/test/files/neg/t7494-no-options/sample_2.flags
@@ -0,0 +1 @@
+-Xplugin:. -Xshow-phases -P:ploogin:inploog
diff --git a/test/files/neg/t7494-no-options/sample_2.scala b/test/files/neg/t7494-no-options/sample_2.scala
new file mode 100644
index 0000000000..73cdc64e40
--- /dev/null
+++ b/test/files/neg/t7494-no-options/sample_2.scala
@@ -0,0 +1,6 @@
+
+package sample
+
+// just a sample that is compiled with the sample plugin enabled
+object Sample extends App {
+}
diff --git a/test/files/neg/t7494-no-options/scalac-plugin.xml b/test/files/neg/t7494-no-options/scalac-plugin.xml
new file mode 100644
index 0000000000..e849bb5919
--- /dev/null
+++ b/test/files/neg/t7494-no-options/scalac-plugin.xml
@@ -0,0 +1,4 @@
+<plugin>
+<name>sample-plugin</name>
+<classname>t6446.Ploogin</classname>
+</plugin>