core::str - making StrSlice trait functions pure #3709
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catamorphism
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core::str - making StrSlice trait functions pure
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RalfJung
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clarify the warning shown when optimizations are enabled, and the status of Tree Borrows
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The functions that these correspond to are pure, but they aren't. This means that there are places where you can't do s.foo(), but can do str::foo(s), which seems wrong.