Add syntux module #3880
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Add syntux module #3880
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This PR adds a
syntuxmodule which aims to provide a thin and safe abstraction layer on top oflibsyntax. The idea is to make rustfmt resistant to breaking changes in the rustc codebase. The ultimate goal is to factor out thesyntuxmodule into a separate crate and avoid usingrustc-ap-*crates directly from rustfmt codebase.