Function run_with_cargo 

pub fn run_with_cargo(
    source: &str,
    source_path: Option<&Path>,
    extra_args: &[String],
) -> Result<(), String>

Compiles and runs a Rust source file that has embedded dependencies.

1. Parses the //! manifest from the source
2. Creates a cached Cargo project directory
3. Writes Cargo.toml and src/main.rs
4. Invokes cargo run --quiet

Stdin/stdout/stderr are inherited, so the program interacts with the terminal normally.