When i run rustdoc for a specific.rs file with an async file i get errorerror

[fariraimasocha]

the command i ran

rustdoc src/lib.rs --crate-name docs

the errorr

error[E0670]: `async fn` is not permitted in Rust 2015       
 --> src/lib.rs:2:5
  |
2 | pub async fn dummy_async_function() -> String {
  |     ^^^^^ to use `async fn`, switch to Rust 2018 or later
  |
  = help: pass `--edition 2021` to `rustc`
  = note: for more on editions, read https://doc.rust-lang.org/edition-guide

error[E0670]: `async fn` is not permitted in Rust 2015
 --> src/lib.rs:8:5
  |
8 | pub async fn foo() {
  |     ^^^^^ to use `async fn`, switch to Rust 2018 or later
  |
  = help: pass `--edition 2021` to `rustc`
  = note: for more on editions, read https://doc.rust-lang.org/edition-guide

error: Compilation failed, aborting rustdoc

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0670`.

please help can i use cargo on that specific file

[jofas]

rustdoc src/lib.rs --crate-name docs --edition 2021

---

Alternatively, if you want to use cargo doc to only document the items in your crate root, you could annotate the public modules you don't want to be documented with #[doc(hidden)].

I haven't really grasped your use-case and what you want to achieve, so it's hard for me to give you good advice on what to do.

[kornel]

cargo doc -p docs

Rustdoc alone doesn’t understand crates and their dependencies. Launch it via Cargo.