Reproduce by doing this:

python buildscripts\resmoke.py --suites=core --mongod=./mongoe jstests/core/read_after_optime.js

readConcern is not implemented for embedded. What should the correct behavior be for embedded? I see these alternatives:

• Fail operations that try and set read/write concern
• Partially implement read concern so this test works
• Leave the code as-is, it doesn't sound dangerous that you can do this.