==== tests/cases/compiler/recursiveBaseCheck6.ts (2 errors) ====
    class S18<A> extends S18<{ S19: A; }>{ }
          ~~~
!!! Type 'S18<A>' recursively references itself as a base type.
    (new S18()).blah;
                ~~~~
!!! Property 'blah' does not exist on type 'S18<{}>'.