Only get 'extract to variable' not 'extract to function' in vscode

Very similar to https://github.com/rust-lang/rust-analyzer/issues/11577, but happening in VSCode, and as far as I know the files are part of the project - certainly they are in git and in a regular cargo crate in a regular cargo workspace.

rust-analyzer version: rust-analyzer version: 0.3.1958-standalone

rustc version: rustc 1.78.0 (9b00956e5 2024-04-29)

editor or extension: VSCode v0.3.1958

relevant settings: nothing special

repository link (if public, optional): private sorry,

code snippet to reproduce: (copied from the troubleshooting guide into my program, then attempted the same extraction).

        let n = 1;
        let m = n + 2;
        // calculate
        let k = m + n;
        let g = 3;

Start by reproducing the extraction actions in VSCode with the provided Rust snippet and compare the behavior with issue #11577. The report is resolved when the same code offers “extract to function” as well as “extract to variable”; the private repository and missing project files make broader reproduction necessary.