not implemented:
       - mode.input_allow_dollars.
       - column counts do not take tabstops into account.
       - mode.output_linenumbers.
       - mode.do_depend.
       - mode.do_macrolist.
       - mode.do_trace.
       - warns.endiflabels. (they cause errors)
       - warns.unused.
       - the -iremap option.
       - $CPP_RESTRICTED
       - other environment variables

tidy up:
       - get rid of inlinedefs.h
       - use of places in and below macro.c is pretty bogus.
       - macro code should be reworked.
       - place_changefile is manky and wastes memory. Also, in an ideal
         world we'd remember the place #line changed the name and refer
         to it when printing errors.

fix:
       - "#if 0 && 1/0" should not crash; fix eval method.
       - quote characters and comment delimiters that are emitted by
         macros are not recognized. See:
               t34 (should produce a quote and FOO Q)
               t35 (similarly, this test may be redundant once it's fixed)
               t36 (C(3) should produce nothing)
               t37 (BC foo EC should produce nothing)
         Joerg says comments like in t36 should be stripped exactly
         twice, once when the macro is defined and again when it's
         expanded. Note that gcc's cpp -traditional is getting t37
         wrong, and it gets t36 wrong with -C.
       - remove the intentionally undocumented -p option and generate
         proper linenumber output. (also, in this code what happens if
         a comment spans files? I bet currently it will emit the line
         number into the comment.)

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