captured wildcard in subtyping constraints: use upper bound only (IDEA-139046)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/constraints/SubtypingConstraintWithSuperCapturedWildcard.java

@@ -0,0 +1,11 @@
+import java.util.Map;
+import java.util.stream.Stream;
+
+import static java.util.stream.Collectors.toMap;
+
+class Test {
+  Map<String, String> foo(Stream<? extends String> stream) {
+    return stream.collect(toMap(s -> s, s -> s));
+  }
+}
+