inference: raise unchecked warning if low/equals bounds are not assignable without unchecked conversion (IDEA-150495)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting8/CheckUncheckedAssignmentDuringVariablesResaolution.java

@@ -0,0 +1,19 @@
+
+import java.util.HashSet;
+
+class Issue {
+  public void some(String group) {
+    new HashSet<Permission>().stream()
+      .map(permission  -> (PrincipalPermission) permission)
+      .filter(permission -> group.equals(permission.getGroup()));
+  }
+}
+
+class Permission {
+}
+
+class PrincipalPermission<<warning descr="Type parameter 'T' is never used">T</warning>> extends Permission {
+  public String getGroup() {
+    return null;
+  }
+}