Add mention of None as possible return. Closes #40435.#40646

Merged

bors merged 1 commit intorust-lang:masterfrom russmack:issue-40435-mention-none

Mar 19, 2017

+4-4

Commits on Mar 19, 2017

Add mention of None as possible return. Closes rust-lang#40435 .
Russell Mackenzie
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