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  • \$\begingroup\$ This answer is invalid, as the user code never gets executed. \$\endgroup\$
    – The Fifth Marshal
    Commented Oct 19, 2015 at 20:11
  • \$\begingroup\$ @ppperry: Sure it does: the macro can be written as part of the user code, and it's executed inside of the compiler. \$\endgroup\$
    – Mason Wheeler
    Commented Oct 19, 2015 at 20:13
  • \$\begingroup\$ You would have to define such a macro for a character of set of characters that needs to be typed in every single program or set of programs that makes boo fit the criteria. \$\endgroup\$
    – The Fifth Marshal
    Commented Oct 19, 2015 at 20:18
  • \$\begingroup\$ @ppperry: yes, invoking the macro (anywhere in the code) is what causes the compiler to break, fulfilling the criteria. If you're trying to say something deeper than that, you'll have to be a bit more clear, because I don't see what the problem is. \$\endgroup\$
    – Mason Wheeler
    Commented Oct 19, 2015 at 20:24
  • 3
    \$\begingroup\$ @slebetman: And when you have a REPL, or macros where user code is executed at compile time, the distinction between the two gets very blurry. \$\endgroup\$
    – Mason Wheeler
    Commented Oct 20, 2015 at 10:00