187     for (_key, mut sub) in &"AABBCCC".chars().group_by(|&x| x) {  in all_equal()
617 fn group_by() {  in group_by()  function
618     for (ch1, sub) in &"AABBCCC".chars().group_by(|&x| x) {  in group_by()
624     for (ch1, sub) in &"AAABBBCCCCDDDD".chars().group_by(|&x| x) {  in group_by()
637         let groups = "AaaBbbccCcDDDD".chars().group_by(&toupper);  in group_by()
653     let groups = "AAABBBCCCCDDDD".chars().group_by(|&x| x);  in group_by()
671         for (_, sub) in &text.chars().group_by(|&x| { ntimes += 1; x}) {  in group_by()
681         for _ in &text.chars().group_by(|&x| { ntimes += 1; x}) {  in group_by()
688         let gr = text.chars().group_by(|&x| x);  in group_by()
696     let groups = data.iter().group_by(|k| *k);  in group_by_lazy_2()
701     let groups = data.iter().group_by(|k| *k);  in group_by_lazy_2()
706     let grouper = data.iter().group_by(|k| *k);  in group_by_lazy_2()
716     let grouper = data.iter().group_by(|k| *k);  in group_by_lazy_2()
735     let grouper = data.iter().group_by(move |_| { let k = i / 3; i += 1; k });  in group_by_lazy_2()
751     let grouper = data.iter().group_by(|elt| *elt);  in group_by_lazy_3()