Rust CLI Troubleshooting: Build Errors and Diagnostics

cargo check

# Type-check without producing final binaries.

cargo build -v

# Show additional build detail from Cargo.

cargo build -vv

# Show even more detail from Cargo.

cargo check --message-format=json

# Print messages in JSON form for editor tooling or scripts.

cargo fix

# Use rustc suggestions to fix straightforward issues.

cargo fix --broken-code

# Try fixing code even if the crate currently does not compile cleanly.

rustc --explain E0308

# Open a detailed explanation for an error code such as E0308.

cargo build --timings

# Inspect slow compilation phases.

let port: u16 = "3000";

# A classic mismatched-type error.

let name = String::from("cli");
let moved = name;
println!("{}", name);

# Illustrates a move-related ownership error.

use std::fs::File;

fn main() {
    let mut file = File::create("out.txt").unwrap();
    file.write_all(b"hello").unwrap();
}

# Method exists but the trait is not in scope.

use std::fs;

fn load() -> std::io::Result<String> {
    let content = fs::read_to_string("Cargo.toml")?;
    Ok(content)
}

# Return a compatible `Result` when using the question-mark operator.