inference: ensure foreign variables do not participate in inference process, e.g. variables from method reference overload resolution (IDEA-154622)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newMethodRef/IgnoreForeignVariables.java

@@ -0,0 +1,27 @@
+
+import java.util.function.Function;
+
+class SomeClass<K, V> {
+
+  SomeClass(Function<K, V> transformer) {}
+
+  static <M, N> SomeClass<M, N> create(Function<M, N> t) {
+    return null;
+  }
+
+  static void someMethod() {
+    final SomeClass<MyBean, String> instance = create(MyBean::overloadedMethod);
+    final SomeClass<MyBean, String> instance1 = new SomeClass<>(MyBean::overloadedMethod);
+  }
+}
+class MyBean {
+
+  private String overloadedMethod(String param) {
+    return param;
+  }
+
+  public String overloadedMethod() {
+    return overloadedMethod(null);
+  }
+
+}