I have a compile error involving a macro:

    &lt;mdo macros&gt;:6:19: 6:50 error: cannot move out of captured outer variable in an `FnMut` closure
    &lt;mdo macros&gt;:6 bind ( $ e , move | $ p | mdo ! { $ ( $ t ) * } ) ) ; (
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    &lt;mdo macros&gt;:1:1: 14:36 note: in expansion of mdo!
    &lt;mdo macros&gt;:6:27: 6:50 note: expansion site
    &lt;mdo macros&gt;:1:1: 14:36 note: in expansion of mdo!
    &lt;mdo macros&gt;:6:27: 6:50 note: expansion site
    &lt;mdo macros&gt;:1:1: 14:36 note: in expansion of mdo!
    src/parser.rs:30:42: 37:11 note: expansion site
    error: aborting due to previous error

Unfortunately, the macro is recursive so it&#39;s hard to figure out what the compiler is complaining about, plus it seems like the line numbers are for the expanded macro rather than my code.

How can I see the expanded macro? Is there a flag I can pass to rustc (or even better, cargo) to dump this out?

(This macro is from [rust-mdo](https://github.com/TeXitoi/rust-mdo), though I don&#39;t think it matters.)

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How do I see the expanded macro code that's causing my compile error?