format (on save) rust nightly support

[dcow]

We use nightly features of cargo fmt so we have to run like cargo +nightly fmt otherwise it messes our formatting up. How can I configure zed to use nightly rust when running format (on save)?

[therealdannzor]

bump

[neongreen]

// .zed/settings.json
{
  "lsp": {
    "rust-analyzer": {
      "initialization_options": {
        "rustfmt": {
          "extraArgs": ["+nightly"]
        }
      }
    }
  }
}

[dream-dasher]

Can confirm that works. Thanks! =)

(By contrast, trying something like in the current zed docs:

    "Rust": {
        "formatter": {
         "external": {
           "command": "cargo",
           "arguments": ["+nightly", "fmt"]
         }
       }
    }

Does not work -- as this is telling zed to feed the file contents into the command. And cargo fmt doesn't accept a text pipe (so the result is the file contents are erased on format. :)