cd07efd264
In US english, "that" is used in restrictive clauses in place of "which", and often affects the meaning of sentences. In UK english and many dialects, no distinction is made. While Rust devs want to avoid unproductive pedanticism, it is worth at least being uniform in documentation such as: http://doc.rust-lang.org/std/iter/index.html and also in cases where correct usage of US english clarifies the sentence.