On Saturday, 21 May 2016 at 14:39:59 UTC, pineapple wrote:
    void clean(in void delegate(in T value) func){
        this.clean((in T values[]) => {
            foreach(value; values) func(value);
        });

This doesn't do what you think it does. It passes a lambda that *returns* that foreach function (that returns void).

    void clean(in void delegate(in T value) func){
        this.clean((in T values[]){
            foreach(value; values) func(value);
        });
    }

This passes a lambda (that returns void).

See https://dpaste.dzfl.pl/f93b9c0c8426

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