Rust-analyzer on VS Code only works on save in 2024? | Rust Programming Language Community | Page 1

pine kindle Jul 15, 2024, 11:28 AM

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I did look into it for a while and found some people saying it doesn't support it because of this and that (I can link the discussion I found if necessary), but that's been said at least 3 or 4 years ago and it was always mentioned that it didn't support it yet, and most cite the rust-analyzer's first blog post that says it was a "new tool" which shouldn't be true by this point.

Is there a way, currently, to have that work even as a workaround? I am even willing to homebrew a vs code extension for that (I don't know how to do that yet, to be clear).

P.S.: I started learning rust a few years ago, but I only just got serious about it, so I consider myself a beginner, which is why I tagged this post with that too.

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Oh also, I am aware of the "files.autoSave": "afterDelay" + "file.autoSaveDelay": 1000 hack. That is not real time. By that I mean linting every keystroke without having to save the file.

pine kindle Jul 15, 2024, 11:54 AM

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I just tested and it does save in real time on nvim using lspconfig with the rust-analyzer lsp

pine kindle Jul 15, 2024, 12:32 PM

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On VSCode in small projects it seems to work sometimes (not always), but testing on, for example, rustlings init doesn't seem to work at all

olive oar Jul 15, 2024, 3:15 PM

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pine kindle On VSCode in small projects it seems to work sometimes (not always), but testing...

Rustlings needs extra config to work with rust analyzer

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It's not a normal project

pine kindle Jul 15, 2024, 3:16 PM

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sure, but I also tried with tokio

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same thing

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I git cloned it

olive oar Jul 15, 2024, 3:16 PM

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pine kindle I did look into it for a while and found some people saying it doesn't support i...

The issue is rust analyzer uses cargo (and by extension rustc) to actually check the code

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However it does things like type inference by itself

pine kindle Jul 15, 2024, 3:18 PM

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right, I did notice the variables were correctly inferred, but the type errors were not shown

olive oar Jul 15, 2024, 3:18 PM

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Yeah, and cargo needs everything on disk to work on it

pine kindle Jul 15, 2024, 3:19 PM

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that would make sense if it didn't work on any circunstance, but it works sometimes

olive oar Jul 15, 2024, 3:20 PM

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Note rust analyzer also does syntax errors by itself

pine kindle Jul 15, 2024, 3:21 PM

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olive oar Note rust analyzer also does syntax errors by itself

badly

olive oar Jul 15, 2024, 3:21 PM

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pine kindle that would make sense if it didn't work on any circunstance, but it works *somet...

Real errors (not syntax stuff) always comes from rustc so it has to have hit disk

pine kindle Jul 15, 2024, 3:22 PM

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olive oar Real errors (not syntax stuff) always comes from rustc so it has to have hit dis...

is that always the case?

olive oar Jul 15, 2024, 3:22 PM

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Yes

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If the error diagnostic says rustc on it then it hit disk

pine kindle Jul 15, 2024, 3:23 PM

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hm

pine kindle Jul 15, 2024, 3:23 PM

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pine kindle badly

shouldn't that count as a syntax error though?

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something like this works

olive oar Jul 15, 2024, 3:24 PM

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Save it

pine kindle Jul 15, 2024, 3:25 PM

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no error

olive oar Jul 15, 2024, 3:25 PM

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pine kindle something like this works

That valid syntax

pine kindle Jul 15, 2024, 3:25 PM

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olive oar That valid syntax

what

olive oar Jul 15, 2024, 3:25 PM

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It's invalid code

pine kindle Jul 15, 2024, 3:25 PM

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rustc doesn't complain though

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oh now it did

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it was looking at an error above

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I see

olive oar Jul 15, 2024, 3:26 PM

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Rust analyzer's syntax check only fails for impossible programs

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?play ```rs
let x = 42;
x;

sturdy vesselBOT Jul 15, 2024, 3:27 PM

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olive oar Jul 15, 2024, 3:27 PM

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This is allowed (it doesn't do anything meaningful) but you didn't have a variable named aasd

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So that makes it invalid

pine kindle Jul 15, 2024, 3:27 PM

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I see

olive oar Jul 15, 2024, 3:28 PM

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But rust analyzer doesn't check that part

pine kindle Jul 15, 2024, 3:28 PM

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somehow rust-analyzer in nvim does error that

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without saving

olive oar Jul 15, 2024, 3:29 PM

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What does the diagnostic say?

pine kindle Jul 15, 2024, 3:29 PM

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there's.... no diagnostic...

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what

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should show this

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it only shows squiggly line

olive oar Jul 15, 2024, 3:30 PM

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Then it's probably some other thing

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Like a spell check

pine kindle Jul 15, 2024, 3:30 PM

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spell check...

olive oar Jul 15, 2024, 3:30 PM

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Does hello; have an underline

pine kindle Jul 15, 2024, 3:30 PM

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    ● actions-preview.nvim 1.17ms  VeryLazy
    ● blackjack.nvim 2.93ms  start
    ● cmp-nvim-lsp 0.04ms  lsp-zero.nvim
    ● Colorizer 1.15ms  start
    ● dashboard-nvim 3.46ms  VimEnter
    ● lazy.nvim 5.15ms  init.lua
    ● lsp-zero.nvim 29.68ms  start
    ● lualine.nvim 7.22ms  start
    ● LuaSnip 2.41ms  lsp-zero.nvim
    ● mason-lspconfig.nvim 0.04ms  start
    ● mason.nvim 0.3ms  lsp-zero.nvim
    ● mini.files 1.4ms  start
    ● nvim-autopairs 1.85ms  InsertEnter
    ● nvim-cmp 1.19ms  lsp-zero.nvim
    ● nvim-hlslens 1.5ms  nvim-scrollbar
    ● nvim-lspconfig 8.35ms  lsp-zero.nvim
    ● nvim-origami 1.86ms  BufReadPost
    ● nvim-scrollbar 4.27ms  start
    ● nvim-surround 1.32ms  VeryLazy
    ● nvim-tetris 0.37ms  start
    ● nvim-treesitter 5.01ms  start
    ● nvim-web-devicons 0.1ms  start
    ● nvimesweeper 0.26ms  start
    ● plenary.nvim 0.32ms  blackjack.nvim
    ● suda.vim 0.43ms  start
    ● telescope.nvim 6.04ms  start
    ● tokyonight 3.48ms  start
    ● vim-commentary 0.25ms  start
    ● vim-fugitive 0.76ms  start
    ● vim-gnupg 0.14ms  start
    ● which-key.nvim 0.82ms  start

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my plugins

pine kindle Jul 15, 2024, 3:31 PM

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olive oar Does hello; have an underline

yes

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hello in my language does too

olive oar Jul 15, 2024, 3:31 PM

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Do hello in english

pine kindle Jul 15, 2024, 3:31 PM

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I did, it had a squiggly line

olive oar Jul 15, 2024, 3:31 PM

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Hmm

pine kindle Jul 15, 2024, 3:32 PM

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both cases

olive oar Jul 15, 2024, 3:32 PM

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It's possible treesitter doesn't like it

pine kindle Jul 15, 2024, 3:32 PM

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ooooh

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lemme disable it rq

olive oar Jul 15, 2024, 3:33 PM

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I'm not seeing anything else in the list that stands out

pine kindle Jul 15, 2024, 3:33 PM

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nope, it was not treesitter

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olive oar Jul 15, 2024, 3:33 PM

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It's something, but I don't know what it is

pine kindle Jul 15, 2024, 3:34 PM

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I mean, if that something somehow also worked on vscode I would be happy

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it is lsp-zero

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I disabled it and it didn't show squiggly line

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but that should be using rust-analyzer

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more specifically, it's mason

olive oar Jul 15, 2024, 3:38 PM

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checking on my neovim it doesn't do this

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i don't use mason

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so that checks out

pine kindle Jul 15, 2024, 3:39 PM

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I have one extension for all lsp needs

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that is lsp-zero

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and that has a mason dependency

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if I comment the 2 lines where that dependency is declared, the squiggly line goes away

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these two

olive oar Jul 15, 2024, 3:40 PM

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pine kindle Jul 15, 2024, 3:41 PM

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right

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that's what happens when I save

olive oar Jul 15, 2024, 3:41 PM

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yeah i have auto save on exiting insert mode

pine kindle Jul 15, 2024, 3:42 PM

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I see

olive oar Jul 15, 2024, 3:42 PM

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Mason has some extra thing it's doing outside of rust analyzer

pine kindle Jul 15, 2024, 3:43 PM

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right, I wonder if I can do the same on vscode

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wait, that's still weird

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mason is a package manager

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for lsps, daps, etc

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and specifically installed rust-analyzer with it

olive oar Jul 15, 2024, 3:51 PM

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What modules does mason have installed?

pine kindle Jul 15, 2024, 3:58 PM

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these ones

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only rust-analyzer is being run, I know because I used :LspInfo

olive oar Jul 15, 2024, 4:06 PM

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What config does rust analyzer have?

pine kindle Jul 15, 2024, 4:07 PM

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the default, I just installed it

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lemme get the json

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{
    "links": {
        "bin": {
            "rust-analyzer": "rust-analyzer-x86_64-unknown-linux-gnu"
        },
        "opt": {},
        "share": {
            "mason-schemas\/lsp\/rust-analyzer.json": "mason-schemas\/lsp.json"
        }
    },
    "name": "rust-analyzer",
    "secondary_sources": [],
    "schema_version": "1.1",
    "primary_source": {
        "id": "pkg:github\/rust-lang\/rust-analyzer@2024-07-15",
        "type": "registry+v1"
    },
    "metrics": {
        "start_time": 1721043990886,
        "completion_time": 1721043993597
    }
}

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should be that? idk

olive oar Jul 15, 2024, 4:10 PM

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I have no clue what it's doing

pine kindle Jul 15, 2024, 4:14 PM

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I don't think that's it, but I don't know where the default configuration is

olive oar Jul 15, 2024, 4:15 PM

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I definitely know the default config for rust analyzer doesn't do this

pine kindle Jul 15, 2024, 4:15 PM

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right

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I did not change it though

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just to be clear, the squiggly line disappears when I do valid code

olive oar Jul 15, 2024, 4:17 PM

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I'm going to say that your mason install is haunted and leave it at that ferrisClueless

pine kindle Jul 15, 2024, 4:17 PM

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like do varThatWasDeclared;

pine kindle Jul 15, 2024, 4:17 PM

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olive oar I'm going to say that your mason install is haunted and leave it at that <:ferri...

I want it to haunt my vscode too lol

olive oar Jul 15, 2024, 4:18 PM

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~~time to perform the summoning ritual ~~

pine kindle Jul 15, 2024, 4:19 PM

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~~rm -rf $(realpath $(dirname $(which nvim)))~~

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I'll try to find what plugin is doing that

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maybe it's not mason

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if I find something I'll send it here, for completion's sake

olive oar Jul 15, 2024, 4:25 PM

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I think I found the setting

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It's probably the experimental diagnostics setting in rust analyzer

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Setting that in vscode I get a lint for a hello; line

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No idea why neovim doesn't show the text for it

pine kindle Jul 15, 2024, 4:30 PM

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what

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what is that

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YOOOOOO

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amazing

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that's everything I wanted

olive oar Jul 15, 2024, 4:31 PM

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I have no idea what type of lints this enables

pine kindle Jul 15, 2024, 4:32 PM

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I prefer false positives than nothing

olive oar Jul 15, 2024, 4:32 PM

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It's still a mystery to me why/how the mason version seems to have this on my default

pine kindle Jul 15, 2024, 4:32 PM

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and if I want clippy I can just save

pine kindle Jul 15, 2024, 4:32 PM

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olive oar It's still a mystery to me why/how the mason version seems to have this on my de...

I am not even sure if that's what's going on

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that said, my initial problem was solved, thanks

#Rust-analyzer on VS Code only works on save in 2024?