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Re:“Python's batteries are leaking” by a1369209993 on Saturday May 18, 2019 @06:12PM (#19950017)
Assuming the keys are Hash + Ord, wouldn't that just be:

  for (k,v) in &src
    { dst.insert(k,v); }

?
Re:“Python's batteries are leaking” by StavrosK on Sunday May 19, 2019 @01:26PM (#19954362)
Yes, that's what I ended up doing, but the error confused me and I ended up looking for a less hacky way for more than an hour until I said "fuck it" and just did that.