lens-mode / inlayHints broken with rust-analyzer since 2022-03-04

[rksm]

Thank you for the bug report

• I am using the latest version of lsp-mode related packages.
• I checked FAQ and Troubleshooting sections
• You may also try reproduce the issue using clean environment using the following command: M-x lsp-start-plain

Bug description

No inlay hints are displayed when using lsp-mode + lsp-lens-mode with rust-analyzer since rust-lang/rust-analyzer#11445. lsp-log reports

[Trace - 06:19:24 PM] Received response 'rust-analyzer/inlayHints - (204)' in 23ms.
Result: {
  "message": "unknown request",
  "code": -32601
}

as the inlayHints method was renamed to experimental/inlayHints and has apparently gotten some semantic changes.

Steps to reproduce

install latest lsp-mode + rust-analyzer,

    let x = 123;

should have a type annotation.

Expected behavior

inlay hints are shown.

Which Language Server did you use?

rust-analyzer

OS

MacOS

Error callstack

[Trace - 06:19:24 PM] Received response 'rust-analyzer/inlayHints - (204)' in 23ms.
Result: {
  "message": "unknown request",
  "code": -32601
}

Anything else?

No response