Hi. [Michael Hudson]

One - probably called Compile - will sport a __call__ method which will act much like the builtin "compile" of 2.1 with the difference that after it has compiled a __future__ statement, it "remembers" it and compiles all subsequent code with the __future__ options in effect.

It will do this by examining the co_flags field of any code object it returns, which in turn means writing and maintaining a Python version of the function PyEval_MergeCompilerFlags found in Python/ceval.c.

FYI, in Jython (internally) we have a series of compile_flags functions that take a "opaque" object CompilerFlags that is passed to the function and compilation actually change the object in order to reflect future statements encoutered during compilation... Not elegant but avoids code duplication. Of course we can change that. Samuele Pedroni.