Comment by ninkendo

Not GP, but I take it to mean I can’t do:

    #define private public
    #import <iostream> // muahaha

Or any such nonsense. Nothing I define with the preprocessor before importing something should effect how that something is interpreted, which means not just #define’s, but import ordering too. (Importing a before b should be the same as importing b before a.) Probably tons of other minutiae, but “not leaking context into the import” is a pretty succinct way of putting it.