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Lsp rust analyzer

Server note#

NOTE: If you are using rustic-mode, you have to change rustic-lsp-server instead of lsp-rust-server, since it also supports eglot as a lightweight alternative to lsp-mode.

  • lsp-rust-server Choose LSP server (default is rust-analyzer)

  • lsp-rust-switch-server Switch priorities of lsp servers

rust-analyzer#

Commands#

lsp-rust-analyzer-syntax-tree#

Display syntax tree for current buffer

lsp-rust-analyzer-status#

Display status information for rust-analyzer

lsp-rust-analyzer-join-lines#

Join selected lines into one, smartly fixing up whitespace and trailing commas

before:

after:

inlay-hints#

lsp-inlay-hints-mode enables displaying of inlay hints

Additionally, lsp-inlay-hint-enable must be set to t in order for inlay hints to render.

NOTE: the inlay hints interact badly with the lsp-ui sideline, because it doesn't seem to consider the overlays in its width calculation, which often leads to lines wrapping around.

Macro expansion#

lsp-rust-analyzer-expand-macro expand macro call at point recursively

Use your own function for displaying macro expansion by customizing lsp-rust-analyzer-macro-expansion-method

Formatted and highlighted result with the default function of rustic.

auto-import#

Get a list of possible auto import candidates with lsp-execute-code-action

Snippet insertion/refactor#

To support refactorings that require snippet insertion(eg. generating derive clause etc), make sure that you have enabled yasnippet and yas-minor-mode. If you are using use-package, you can do something like this:

(use-package yasnippet
  :ensure t
  :hook ((lsp-mode . yas-minor-mode)))

Open Cargo.toml#

lsp-rust-analyzer-open-cargo-toml opens the Cargo.toml closest to the current file. Calling it with a universal argument will open the Cargo.toml in another window.

Corresponds to the rust-analyzer LSP extension

Open external documentation#

lsp-rust-analyzer-open-external-docs opens external documentation related to the current position in a browser.

Corresponds to the rust-analyzer LSP extension

lsp-rust-analyzer-related-tests find all tests related to the current position, asks for user completion and executes the selected test in a compilation buffer.

Corresponds to the rust-analyzer LSP extension

In the example below, first you see that: + On the left, the function check_infer is defined, on the right another file is opened with many test functions, some of which call check_infer. With the cursor on check_infer, call lsp-rust-analyzer-related-tests and select infer_pattern_match_slice with fuzzy matching. The test is executed on the right with compilation major mode

  • Move the cursor to fn ellipsize and attempt to find related tests to no avail. Confirm that the function is indeed untested by using swiper and finding one place in the file, where the function is called

Caveats#

  • Rust Analyzer does not support disabling snippets - https://github.com/rust-analyzer/rust-analyzer/issues/2518

extract signature#

This unmerged PR contains an example method that allows modifying the signature that is displayed by eldoc.

Last update: December 30, 2025

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