Scott Lamb 843e1b49c8 take FnMut closures by reference ...

I mistakenly thought these had to be monomorphized. (The FnOnce still
does, until rust-lang/rfcs#1909 is implemented.) Turns out this way works
fine. It should result in less compile time / code size, though I didn't check
this.

2018-02-23 09:19:42 -08:00

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