- 
            There are a number of bugs in the implementation of lambda
            and let constructs in Boost Phoenix
            3.0.6 (Boost release 1.57.0).
          
- 
            These are currently being investigated and a better version for Boost
            1.58.0.
          
- 
            The constructs are not completely unusable and many of the tests run.
          
- 
            Some usage may work with some compilers but not others.
          
- 
            Workarounds for different compilers are being made available and can
            be seen in the tests where they are used.
          
- 
            For Boost Phoenix 3.2.0 most tests now run and work is continuing to
            resolve the remaining problems.