Only things I've already typed will show up as completion options [Rust]

[poperigby]

Information

VIM version
NVIM v0.4.4
Build type: Release

Operating System
Arch Linux

What went wrong

With ALE completion enabled, when editing a .rs file, and starting to type the a few letters, all of the options are just things I've already typed in the file. So nothing that I haven't typed before is shown as an option for completion.

Reproducing the bug

1. Enable ALE completion
2. Open a .rs file
3. Start typing

:ALEInfo

 Current Filetype: rust
Available Linters: ['analyzer', 'cargo', 'rls', 'rustc']
  Enabled Linters: ['cargo', 'rls']
  Ignored Linters: []
 Suggested Fixers: 
  'remove_trailing_lines' - Remove all blank lines at the end of a file.
  'rustfmt' - Fix Rust files with Rustfmt.
  'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
 Linter Variables:

let g:ale_rust_cargo_avoid_whole_workspace = 1
let g:ale_rust_cargo_check_all_targets = 0
let g:ale_rust_cargo_check_examples = 0
let g:ale_rust_cargo_check_tests = 0
let g:ale_rust_cargo_clippy_options = ''
let g:ale_rust_cargo_default_feature_behavior = 'default'
let g:ale_rust_cargo_include_features = ''
let g:ale_rust_cargo_target_dir = ''
let g:ale_rust_cargo_use_check = 1
let g:ale_rust_cargo_use_clippy = 0
let g:ale_rust_ignore_error_codes = []
let g:ale_rust_ignore_secondary_spans = 0
let g:ale_rust_rls_config = {}
let g:ale_rust_rls_executable = 'rls'
let g:ale_rust_rls_toolchain = ''
 Global Variables:

let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = 0
let g:ale_command_wrapper = ''
let g:ale_completion_delay = v:null
let g:ale_completion_enabled = 1
let g:ale_completion_max_suggestions = v:null
let g:ale_disable_lsp = 0
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = 0
let g:ale_fixers = {'rust': ['rustfmt']}
let g:ale_history_enabled = 1
let g:ale_history_log_output = 1
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = 1
let g:ale_lint_on_filetype_changed = 1
let g:ale_lint_on_insert_leave = 1
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'normal'
let g:ale_linter_aliases = {}
let g:ale_linters = {'rust': ['rls', 'cargo']}
let g:ale_linters_explicit = 0
let g:ale_linters_ignore = {}
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_lsp_root = {}
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = 0
let g:ale_pattern_options = v:null
let g:ale_pattern_options_enabled = v:null
let g:ale_set_balloons = 0
let g:ale_set_highlights = 1
let g:ale_set_loclist = 1
let g:ale_set_quickfix = 0
let g:ale_set_signs = 1
let g:ale_sign_column_always = 0
let g:ale_sign_error = '●'
let g:ale_sign_info = '.'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = '●'
let g:ale_sign_style_warning = '.'
let g:ale_sign_warning = '.'
let g:ale_sign_highlight_linenrs = 0
let g:ale_statusline_format = v:null
let g:ale_type_map = {}
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 0
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
  Command History:

(executable check - success) cargo
(finished - exit code 0) ['/bin/sh', '-c', '''cargo'' --version']

<<<OUTPUT STARTS>>>
cargo 1.47.0 (f3c7e066a 2020-08-28)
<<<OUTPUT ENDS>>>

(executable check - success) rls
(started) ['/bin/sh', '-c', '''rls''']
(finished - exit code 0) ['/bin/sh', '-c', 'cd ''/home/cassidy/Projects/rust-sandbox'' && cargo check --frozen --message-format=json -q']

<<<OUTPUT STARTS>>>
{"reason":"compiler-artifact","package_id":"rust-sandbox 0.1.0 (path+file:///home/cassidy/Projects/rust-sandbox)","target":{"kind":["bin"],"crate_types":["bin"],"name":"rust-sandbox","src_path":"/home/cassidy/Projects/rust-sandbox/src/main.rs","edition":"2018","doctest":false,"test":true},"profile":{"opt_level":"0","debuginfo":2,"debug_assertions":true,"overflow_checks":true,"test":false},"features":[],"filenames":["/home/cassidy/Projects/rust-sandbox/target/debug/deps/librust_sandbox-4a5969f2b1da3ab0.rmeta"],"executable":null,"fresh":true}
{"reason":"build-finished","success":true}
<<<OUTPUT ENDS>>>

[poperigby]

The only linter that works with completion is RLS, but the linting doesn't work on that one. I'm trying to get rust-analyzer to work, where completion doesn't work, but linting does.

[nospam2998]

This seems to be a rls specific issue. That language server has been deprecated and sunset. With it rls no longer available nor working, can we suggest this ticket to be closed?

[w0rp]

I'll close this, and also mention that setting g:ale_completion_autoimport to 1 will probably solve the issue for any language server that lets you auto-import names.