to use `async fn`, switch to Rust 2018 or later

I’m trying to compile a lib in rust and I get the following error:

to use `async fn`, switch to Rust 2018 or later

This is my cargo.toml:

[package]
name = "name"
version = "0.1.0"
edition = "2018"

and to compile I use the following command line (documentation here):

rustc --crate-type=lib src/apis/my_file.rs

does anyone have an idea?

>Solution :

As the name implies Cargo.toml is interpreted by cargo, not rustc if you want to compile with rustc you have to add the edition flag:

rustc --edition=2018 --crate-type=lib src/apis/my_file.rs