rust-analyzer wanted features & bugfixes

[ojeda]

Features that we would like to see

Required (we almost certainly want them)

• discoverConfig.

  • Details/discussion: Support .rust-project.json (i.e. hidden) rust-lang/rust-analyzer#17816 (comment).
  • PR: feature: teach rust-analyzer to discover linked_projects rust-lang/rust-analyzer#17246.
  • Issue: Lazy Workspace/Project Discovery rust-lang/rust-analyzer#17537.
  • Issue: Announcements: Client Changes rust-lang/rust-analyzer#4604.

• Edition 2024 support.

  • Our plan is to migrate to Edition 2024 as soon as possible (unless a blocker is found, of course).
  • Issue: 2024 Edition  rust-lang/rust-analyzer#16146.

Nice to have (not critical, we could workaround if needed, etc.)

Low priority (we will likely not use them in the end)

Done (stabilized, fixed, not needed anymore, etc.)

• A way to avoid exploding the size of rust-project.json with thousands of cfgs defined repeatedly per crate.

  • Issue: Specifying a set of cfgs for given crates (cfg groups) rust-lang/rust-analyzer#17815.
  • If we end up using the discoverConfig support (and we replace completely rust-project.json -- see also a few notes at Support .rust-project.json (i.e. hidden) rust-lang/rust-analyzer#17816 (comment)), then we would not need this anymore, and rust-analyzer will likely remove it: feat: Allow declaring cfg groups in rust-project.json, to help sharing common cfgs rust-lang/rust-analyzer#17857 (comment).
  • PR: feat: Allow declaring cfg groups in rust-project.json, to help sharing common cfgs rust-lang/rust-analyzer#17857.

• Support .rust-project.json (i.e. hidden).

  • Issue: Support .rust-project.json (i.e. hidden) rust-lang/rust-analyzer#17816.
  • PR: Allow rust-project.json to be hidden rust-lang/rust-analyzer#17818.

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Bugs that we would like to see fixed

Required (we almost certainly want them)

• Support goto-definition for include!(concat!(env!("OBJTREE"), "/..._generated.rs"));
  • Potentially the cause of rust-analyzer: go to definition for bindings::* for out of tree builds #1050.
  • Issue: goto-definition for include*!(expr), where expr is not a string literal rust-lang/rust-analyzer#15836.

Nice to have (probably not critical, we could workaround if needed, etc.)

Low priority (we will likely not use them in the end)

Done (stabilized, fixed, or not needed anymore, etc.)