command-line argument to the compiler will show the result of expansion.
If Rust's macro system can't do what you need, you may want to write a
-[compiler plugin](plugin.html) instead. Compared to `macro_rules!`
+[compiler plugin](plugins.html) instead. Compared to `macro_rules!`
macros, this is significantly more work, the interfaces are much less stable,
and the warnings about debugging apply ten-fold. In exchange you get the
flexibility of running arbitrary Rust code within the compiler. Syntax