Fix stat.rs to not pollute the build directory. Closes #6959.
auto merge of #6960 : msullivan/rust/fix-pollution, r=brson
std: add an external iterator for mutating vec elements
auto merge of #6964 : huonw/rust/vec-mut-iter, r=thestinger
Fix duplicate words in the docs
Deduplicate words in code comments
auto merge of #6966 : alco/rust/fix-typo, r=sanxiyn