Forbidden old invokeExtension convention.

compiler/testData/diagnostics/tests/resolve/invoke/implicitInvoke.kt

@@ -0,0 +1,35 @@
+class B
+
+class A {
+    operator fun B.invoke() = 4
+}
+
+class X {
+    operator fun invoke() = 3
+}
+
+fun test(a: A, b: B) {
+    with (a) {
+        b()
+        (b)()
+    }
+
+    X()()
+    val x = X()
+    x()
+    (x)()
+}
+
+fun test(c: () -> String, e: Int.() -> String) {
+    c()
+    (c)()
+
+    3.e()
+    3.(e)()
+    with(3) {
+        e()
+        (e)()
+    }
+}
+
+fun <T, R> with(receiver: T, f: T.() -> R): R = receiver.f()