[c++ mode] Add lambda test
[c++ mode] Add lambda test

Issue #10

codemirror/google-modes,codemirror/google-modes,codemirror/google-modes,codemirror/google-modes,codemirror/google-modes,codemirror/google-modes,codemirror/google-modes,codemirror/google-modes,codemirror/google-modes