> And of course it's possible to change something to a trait after the
> fact without breaking API compatibility.
How you are doing this? I'm in fact a newbie in Rust, and it's interesting
that this can be done. std::num::pow() is a good example, I think.
Suppose I already have a program which is using std::num::pow() with a
self defined integer type. Now you are changing std::num::pow(), moving
the functionality into a trait. And my program will still compile and work
as before?
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