Delegated Properties: allowing type parameters for get/set methods

#KT-6253 Fixed

compiler/testData/diagnostics/tests/delegatedProperty/inference/genericMethodInGenericClass.kt

@@ -0,0 +1,25 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class A<R>() {
+    fun <T> get(t: Any?, p: PropertyMetadata): T = null!!
+    fun <T> set(t: Any?, p: PropertyMetadata, x: T) = Unit
+}
+
+var a1: Int by <!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>A<!>()
+var a2: Int by A<String>()
+
+class B<R>() {
+    fun <T> get(t: Any?, p: PropertyMetadata): T = null!!
+    fun set(t: Any?, p: PropertyMetadata, x: R) = Unit
+}
+
+var b1: Int by B()
+var b2: Int by B<Number>()
+
+class C<R>() {
+    fun get(t: Any?, p: PropertyMetadata): R = null!!
+    fun <T> set(t: Any?, p: PropertyMetadata, x: T) = Unit
+}
+
+var c1: Int by C()
+var c2: Int by <!DELEGATE_SPECIAL_FUNCTION_RETURN_TYPE_MISMATCH!>C<Number>()<!>