Remove unnecessary return
rustc: Eliminate a derived error in check::_match
Merge pull request #8479 from catamorphism/derived-errors

rustc: Eliminate a derived error in check::_match
auto merge of #8480 : cmr/rust/tutorial, r=metajack
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auto merge of #8525 : graydon/rust/2013-08-14-register-snapshots, r=brson

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