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  #if 0
    // Normal path
  #else
    // Debug path
  #endif
Only works with C and C++, though.
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It's awesome in both senses! How readable has it become for you over time? Because on first glance and without syntax highlighting it's a head-scratcher.
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With syntax highlighting I instantly know what it is :) But to be honest it's just for when I find myself toggling something a lot during development.. but still am too lazy to make a variable.
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