What is the name of the feature that autocompletes parameter name and type if it exists in another function

[ZylosLumen]

Like if you have fn a(len: usize) {} and start writing fn b(l$0) {} it will suggest len: usize.
It is really helpful and I want to study the code to see how it is done

[lnicola]

Probably https://github.com/rust-lang/rust-analyzer/blob/45ae0abfedfa5b15d7825ac7e572287c5f45ab7f/crates/ide-completion/src/completions/fn_param.rs, according to the tests in https://github.com/rust-lang/rust-analyzer/blob/45ae0abfedfa5b15d7825ac7e572287c5f45ab7f/crates/ide-completion/src/tests/fn_param.rs.

[ZylosLumen]

That is it. Thank you!