Compilation error: can't find crate for `core`
I'm using Rust 1.35.0 to try out some Rust examples and I could not get it to compile, as I keep getting the following message: error[E0463]: can't find crate for `core` I ran rustc --explain E0463 and I see the following message: You need to link your code to the relevant crate in order to be able to use it (through Cargo or the `-L` option of rustc example). Plugins are crates as well, and you link to them the same way. Here is my Cargo.toml: [package] name = "sensor-node" version = "0.1.0" authors = ["joesan <[email protected]>"] edition = "2018" [dependencies] dwm1001 = "0.1.0" panic-halt = "0.2.0" nb = "0.1.1" Here is my main.rs: fn main() { let s = String::from("hello"); // s comes into scope takes_ownership(s); // s's value moves into the function... // ... and so is no longer valid here let x = 5; // x comes into scope makes_copy(x); // x would move into the function, // but i32 is Copy, so it’s okay to still // use x afterward } // Here, x goes out of scope, then s. But because s's value was moved, nothing // special happens. fn takes_ownership(some_string: String) { // some_string comes into scope println!("{}", some_string); } // Here, some_string goes out of scope and `drop` is called. The backing // memory is freed. fn makes_copy(some_integer: i32) { // some_integer comes into scope println!("{}", some_integer); } // Here, some_integer goes out of scope. Nothing special happens.
Your code works fine on the Rust playground, so I recommend checking your Rust installation and environment settings. You may want to use the preconfigured Rust Docker image to run your app. Have Docker installed, then: docker pull rust Go to your project folder and run: docker run --rm --user "$(id -u)":"$(id -g)" -v "$PWD":/usr/src/myapp -w /usr/src/myapp rust cargo run Output: hello 5 For your simple example on a PC, you don't need any of these dependencies: [dependencies] dwm1001 = "0.1.0" panic-halt = "0.2.0" nb = "0.1.1" Here are my steps to test your sample on Linux: cargo new hello cd hello code . Open main.rs and paste your sample main.rs and save: fn main() { let s = String::from("hello"); // s comes into scope takes_ownership(s); // s's value moves into the function... // ... and so is no longer valid here let x = 5; // x comes into scope makes_copy(x); // x would move into the function, // but i32 is Copy, so it’s okay to still // use x afterward } // Here, x goes out of scope, then s. But because s's value was moved, nothing // special happens. fn takes_ownership(some_string: String) { // some_string comes into scope println!("{}", some_string); } // Here, some_string goes out of scope and `drop` is called. The backing // memory is freed. fn makes_copy(some_integer: i32) { // some_integer comes into scope println!("{}", some_integer); } // Here, some_integer goes out of scope. Nothing special happens. In a terminal inside the hello folder, run: cargo run And the output is good: hello 5 This may help: Shell command rustup component list --installed Output: cargo-x86_64-unknown-linux-gnu clippy-x86_64-unknown-linux-gnu rls-x86_64-unknown-linux-gnu rust-analysis-x86_64-unknown-linux-gnu rust-docs-x86_64-unknown-linux-gnu rust-src rust-std-x86_64-unknown-linux-gnu rustc-x86_64-unknown-linux-gnu rustfmt-x86_64-unknown-linux-gnu Shell command: rustup show Output: Default host: x86_64-unknown-linux-gnu installed toolchains -------------------- stable-x86_64-unknown-linux-gnu (default) nightly-x86_64-unknown-linux-gnu active toolchain ---------------- stable-x86_64-unknown-linux-gnu (default) rustc 1.35.0 (3c235d560 2019-05-20)
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