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Implement if let#16741

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Commits on Aug 25, 2014

• Teach libsyntax about `if let`

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• Desugar 'if let' into the appropriate 'match'

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• Add tests for `if let`

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Commits on Aug 28, 2014

• Produce a better error for irrefutable `if let` patterns

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• Only print "irrefutable if-let pattern" errors once

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• Move `if let` behind a feature gate

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• Update based on PR feedback

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