src/module-impl.lisp: Don't emit `#line' to non-position-aware streams.
Because we can't switch back afterwards, the compiler will blame the
wrong thing. Also, if the output stream isn't position-aware, it's
probably because we're in the midst of pretty-printing something, and
forcing `#line' directives will produce hideous results.
This is all rather unfortunate. It's clearly a bug that we can't
produce pretty output and have useful error location information, but I
think this is the best I can manage right now.
~mdw / sod / commit