Document why str.to_{lower,upper}case return String#40335
Merged
bors merged 1 commit intorust-lang:masterfrom Mar 9, 2017
Merged
Document why `str.to_{lower,upper}case` return `String`#40335bors merged 1 commit intorust-lang:masterfrom
bors merged 1 commit intorust-lang:masterfrom
