Trying to concatenate strings with operator += results in an Internal Compiler Error

[Matthias247]

The following code produces an internal compiler error:

fn main() {
    let mut mystr = ~"";
    mystr += ~"abc";
    println(mystr);
}

Compiler output:

$ rustc.exe main.rs
main.rs:7:5: 7:20 error: binary operation + cannot be applied to type `~str`
main.rs:7     mystr += ~"abc";
              ^~~~~~~~~~~~~~~
error: internal compiler error: no type for node 48: expr "abc" (id=48) in fcx 0
x65041c0
This message reflects a bug in the Rust compiler.
We would appreciate a bug report: https://github.com/mozilla/rust/wiki/HOWTO-submit-a-Rust-bug-report
task 'rustc' failed at 'explicit failure', C:\Rust\rust\src\libsyntax\diagnostic.rs:75
task '<main>' failed at 'explicit failure', C:\Rust\rust\src\librustc\lib.rs:440

[RichardlL]

Is There anyway around this?

[thestinger]

Closed by #11449 (wasn't listed properly in the commit message).

[thestinger]

@RichardlL: This bug isn't present anymore. It's correctly reporting that += cannot be applied without an ICE.