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book: define trait

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Tshepang Lekhonkhobe 2015-06-09 02:32:29 +02:00
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src/doc/trpl/traits.md
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% Traits
A trait is a language feature that tells the Rust compiler about
functionality a type must provide.
Do you remember the `impl` keyword, used to call a function with [method
syntax][methodsyntax]?