lambda: check assignable takes into account wildcards (IDEA-108195)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/IDEA108195.java

@@ -0,0 +1,12 @@
+class Demo {
+
+    Function<Supplier<Double>, ? extends Supplier<Double>> mapper2 = (sa) -> () -> sa.get() + 1.0;
+
+    interface Supplier<T> {
+      public T get();
+    }
+  
+    interface Function<T, R> {
+      public R apply(T t);
+    }
+}