Rust anything (as opposed to just `Any`) type's to string

type_name.rs

pub trait TypeName {
    fn type_name(&self) -> &str {
        std::any::type_name::<Self>().trim_start_matches("dyn::")
    }
}

impl<T> TypeName for T {}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_i32() {
        assert_eq!(1_i32.type_name(), "i32");
    }

    #[test]
    fn test_option() {
        assert_eq!(Some(5_i32).type_name(), "Option<i32>");
    }

    #[test]
    fn test_struct() {
        struct Foo;
        assert_eq!(Foo.type_name(), "Foo");
    }
}