Merge pull request #2717 from retronym/ticket/6574

SI-6574 Support @tailrec for extension methods.

2 files changed, 17 insertions, 0 deletions

diff --git a/test/files/neg/t6574.check b/test/files/neg/t6574.check
new file mode 100644
index 0000000000..c67b4ed804
--- /dev/null
+++ b/test/files/neg/t6574.check
@@ -0,0 +1,7 @@
+t6574.scala:4: error: could not optimize @tailrec annotated method notTailPos$extension: it contains a recursive call not in tail position
+    println("tail")
+    ^
+t6574.scala:8: error: could not optimize @tailrec annotated method differentTypeArgs$extension: it is called recursively with different type arguments
+    {(); new Bad[String, Unit](0)}.differentTypeArgs
+                                   ^
+two errors found
diff --git a/test/files/neg/t6574.scala b/test/files/neg/t6574.scala
new file mode 100644
index 0000000000..bba97ad62e
--- /dev/null
+++ b/test/files/neg/t6574.scala
@@ -0,0 +1,10 @@
+class Bad[X, Y](val v: Int) extends AnyVal {
+  @annotation.tailrec final def notTailPos[Z](a: Int)(b: String) {
+    this.notTailPos[Z](a)(b)
+    println("tail")
+  }
+
+  @annotation.tailrec final def differentTypeArgs {
+    {(); new Bad[String, Unit](0)}.differentTypeArgs
+  }
+}