draft:fix(#19266): add test cases

Author: i10416

tests/pos/i19266.scala

@@ -0,0 +1,9 @@
+object i19266:
+  def fn1(x: Int, y: String = "y")(z: Double) = Some(s"$x$y$z")
+  def fn2(x: Int)(y: String) = Some(s"$x$y")
+
+  def checkCompile =
+    fn1(1)
+    // This should compile with warning
+    fn2(2)
+    val _ = fn2(3)

tests/warn/i19266.scala

@@ -0,0 +1,8 @@
+object i19266:
+  def fn1(x: Int, y: String = "y")(z: Double) = Some(s"$x$y$z")
+  def fn2(x: Int)(y: String) = Some(s"$x$y")
+
+  def checkWarning =
+    fn1(1) // warn
+    fn2(2) // warn
+    val a = fn2(3) // warn