SI-8022 Backwards compatibility for Regex#unapplySeq

The change in ce1bbfe / SI-6406 introduced overloads of
`unapplySeq` with wider static and dynmaic result types
than the now-deprecated alternative that accepted `Any`.

This is subtly source incompatible and the change was noticed
in Specs2.

This commit uses `List` as the static and runtime type for
the new overloads.

For consistency, the same is done for the new method added
in SI-7737 / 93e9623.

1 files changed, 30 insertions, 0 deletions

diff --git a/test/junit/scala/util/matching/RegexTest.scala b/test/junit/scala/util/matching/RegexTest.scala
new file mode 100644
index 0000000000..d25842cc57
--- /dev/null
+++ b/test/junit/scala/util/matching/RegexTest.scala
@@ -0,0 +1,30 @@
+
+package scala.util.matching
+
+import org.junit.Assert._
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(classOf[JUnit4])
+class RegexTest {
+  @Test def t8022CharSequence(): Unit = {
+    val full = """.*: (.)$""".r
+    val text = "   When I use this operator: *"
+    // Testing 2.10.x compatibility of the return types of unapplySeq
+    val x :: Nil = full.unapplySeq(text: Any).get
+    val y :: Nil = full.unapplySeq(text: CharSequence).get
+    assertEquals("*", x)
+    assertEquals("*", y)
+  }
+
+  @Test def t8022Match(): Unit = {
+    val R = """(\d)""".r
+    val matchh = R.findFirstMatchIn("a1").get
+    // Testing 2.10.x compatibility of the return types of unapplySeq
+    val x :: Nil = R.unapplySeq(matchh: Any).get
+    val y :: Nil = R.unapplySeq(matchh).get
+    assertEquals("1", x)
+    assertEquals("1", y)
+  }
+}