Overridden functions using default arguments in recursive call are no more considered tail recursive #KT-4285 Fixed

compiler/testData/diagnostics/tests/tailRecOverridden.kt

@@ -0,0 +1,32 @@
+// See also KT-4285
+open class A {
+    open fun foo(x: Int = 0) {}
+
+    open fun gav(y: Int = 1, z: Int = 2) {}
+}
+
+class B: A() {
+    <!NO_TAIL_CALLS_FOUND!>tailrec override fun foo(x: Int)<!> {
+        foo()
+    }
+
+    <!NO_TAIL_CALLS_FOUND!>tailrec override fun gav(y: Int, z: Int)<!> {
+        gav(y)
+    }
+
+    tailrec fun bar(y: Double): Double = bar(y * 2.0)
+}
+
+class C: A() {
+    tailrec override fun foo(x: Int) {
+        foo(0)
+    }
+
+    tailrec override fun gav(y: Int, z: Int) {
+        gav(y - 1, z - 1)
+    }
+
+    tailrec fun bar(<!UNUSED_PARAMETER!>y<!>: Int = 1, z: Int = 2) {
+        bar(z)
+    }
+}