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Merge pull request #1445 from guoard/patch-1
docs(variables): wrap mut keyword with backtick
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In Rust, variables are immutable by default.
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When a variable is immutable, once a value is bound to a name, you can’t change that value.
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You can make them mutable by adding mut in front of the variable name.
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You can make them mutable by adding `mut` in front of the variable name.
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## Further information
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