rust - add strings and print them out

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I am currently learning Rust (mostly from scratch) and now I want to add two strings together and print them out. But that is not as easy as in other languages. Here's what I've done so far (also tested with print!):

fn sayHello(id: str, msg: str) {
    println!(id + msg);
}

fn main() {
    sayHello("[info]", "this is rust!");
}

The error I get is a little bit weird.

$ rustc hello.rs
hello.rs:2:11: 2:19 error: expected a literal
hello.rs:2      println!(id + msg);
                         ^~~~~~~~
note: in expansion of concat!
<std macros>:1:33: 1:58 note: expansion site
note: in expansion of format_args!
<std macros>:2:25: 2:58 note: expansion site
<std macros>:1:1: 2:62 note: in expansion of print!
<std macros>:1:23: 1:60 note: expansion site
<std macros>:1:1: 3:58 note: in expansion of println!
hello.rs:2:2: 2:21 note: expansion site
error: aborting due to previous error

How can I solve this so that [info] this is rust will be printed out?

~ J

asked 11 secs ago

Jan

1

rust - add strings and print them out