[cargo build error]

[vijaypanchalr3]

error[E0658]: use of unstable library feature 'or_insert_with_key'
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/cstree-0.6.1/src/green/builder.rs:142:14
|
142 | .or_insert_with_key(|head| GreenNode::from_head_and_children(head.clone(), children.iter().cloned()))
| ^^^^^^^^^^^^^^^^^^
|
= note: see issue #71024 rust-lang/rust#71024 for more information

error[E0658]: use of unstable library feature 'or_insert_with_key'
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/cstree-0.6.1/src/green/builder.rs:152:14
|
152 | .or_insert_with_key(|data| GreenToken::new(*data))
| ^^^^^^^^^^^^^^^^^^
|
= note: see issue #71024 rust-lang/rust#71024 for more information

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0658.
error: could not compile cstree.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: failed to compile texlab v3.3.1 (https://github.com/latex-lsp/texlab.git#e31b9201), intermediate artifacts can be found at /tmp/cargo-install8TwOWK

Caused by:
build failed

[pfoerster]

Thanks for the report. I think your compiler version is too old. The function or_insert_with_key has been stable since Rust 1.50.0 (see here and texlab requires 1.51.0+). Please try updating your compiler. Also, be sure to use the --locked flag in conjunction with cargo install if not done already.