8916: ItemTree pretty-printing r=jonas-schievink a=jonas-schievink This adds a printer for `ItemTree` contents, and a few tests to ensure that `ItemTree` lowering works like we expect it to. It also adds a new "Debug ItemTree" command that can be used to see the `ItemTree` of the currently open file. The pretty-printed output is usually close enough to Rust syntax that we can even use Rust syntax highlighting. This is similar to the old `ItemTree` tests we had, but produces significantly more readable output, so these should actually carry their weight. Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
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