Add plugins for Rust support.

sources_non_forked/vim-racer/README.md

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+# Vim Racer Plugin
+
+This plugin allows vim to use [Racer](http://github.com/phildawes/racer) for Rust code completion and navigation.
+
+## Installation
+
+1. Build / Install [Racer](http://github.com/phildawes/racer)
+
+1. Install using Pathogen, Vundle or NeoBundle. Or, copy `plugin/racer.vim` into your `~/.vim/plugin` directory.
+
+  Vundle users:
+  ```
+  Plugin 'racer-rust/vim-racer'
+  ```
+
+  NeoBundle users:
+  ```
+  NeoBundle 'racer-rust/vim-racer'
+  ```
+  
+  vim-plug users:
+  ```
+  Plug 'racer-rust/vim-racer'
+  ```
+
+2. Add `g:racer_cmd` and `$RUST_SRC_PATH` variables to your `.vimrc`. Also it's worth turning on 'hidden' mode for buffers otherwise you need to save the current buffer every time you do a goto-definition. E.g.:
+
+     ```
+     set hidden
+     let g:racer_cmd = "<path-to-racer>/target/release/racer"
+     let $RUST_SRC_PATH="<path-to-rust-srcdir>/src/"
+     ```
+
+3. In insert mode use `C-x-C-o` to search for completions
+
+4. In normal mode type `gd` to go to a definition