Fix #319 - Enable only cargo for Rust by default

autoload/ale/linter.vim

@@ -18,10 +18,13 @@ let s:default_ale_linter_aliases = {
 " The user defined linter selections will be merged with this Dictionary.
 "
 " No linters are used for plaintext files by default.
+"
+" Only cargo is enabled for Rust by default.
 let s:default_ale_linters = {
-\   'zsh': ['shell'],
 \   'csh': ['shell'],
+\   'rust': ['cargo'],
 \   'text': [],
+\   'zsh': ['shell'],
 \}
 
 " Testing/debugging helper to unload all linters.

doc/ale.txt

@@ -289,8 +289,10 @@ g:ale_linters                                                   *g:ale_linters*
   following values: >
 
   {
-  \   'zsh': ['shell'],
   \   'csh': ['shell'],
+  \   'rust': ['cargo'],
+  \   'text': [],
+  \   'zsh': ['shell'],
   \}
 <
   This option can be used to enable only a particular set of linters for a
@@ -1047,6 +1049,13 @@ Some linters may have requirements for some other plugins being installed.
      recommended to turn off |g:ale_lint_on_text_changed| and to turn on
      |g:ale_lint_on_save|.
 
+  Only cargo is enabled by default. To switch to using rustc instead of cargo,
+  configure |g:ale_linters| appropriately: >
+
+  " Set the help text for the option for more information.
+  let g:ale_linters = {'rust': ['rustc']}
+<
+
   Also note that rustc 1.12. or later is needed.
 
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