I've run into a rather weird error with #fmt and floats: ``` use std; import std::io; fn main() { let f = -0.550153; let s = #fmt("%f", f); io::println(s); } ``` Incorrectly prints out `0`. But if we instead write: ``` use std; import std::io; fn main() { let f = -0.550153; let s = #fmt("%f", f); io::println(s); io::println("before " + s + " after"); } ``` It prints out: ``` -0.550152 before -0.550152 after ```