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The Ultimate Guide to Rust Programming

The Type of Owned Strings

Understand the Rust owned string type, String, and its full namespace path std::string::String. Learn how Rust's compiler reports type mismatches involving strings and how to correctly annotate string variables with their full types.

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The type of an owned string is String. You can test this by modifying the program above to have a type annotation, e.g.,

Rust 1.40.0
fn main() {
    let first_name = "Michael".to_owned();
    let last_name = " Snoyman";
    let full_name: String = first_name + last_name;
    println!("Full name is {}", full_name);
}

However, when you get a type error, the compiler will usually give you a slightly more verbose name. If I make a mistake and say i32 instead of String, I’ll get this error message:

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