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I wish they didn't change this. unsafeAddr may be a confusing name,
but it's more powerful than addr. Merging them violates the principle
of least power.
e.g. say I get n thru a param, and shadow it
proc x(n: int) =
var n = n + 1
a screen or two later I call
mutates_variable_in_c(addr i)
then later I no longer need to add 1, so I remove the var line.
In Nim 1.6 the compiler refuses to compile, I can instantly find the
bug. In 2.0 it does... whatever?? Maybe for an int it "works", for an
object it likely doesn't. Certainly not something I'd enjoy debugging.
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