If interface method has generic parameters, interface is not functional.

compiler/testData/loadJava/compiledJava/singleAbstractMethod/GenericMethodParameters.java

@@ -0,0 +1,7 @@
+package test;
+
+import java.util.List;
+
+public interface GenericMethodParameters {
+    <A extends CharSequence, B extends List<A>> void method(A[] a, B b);
+}