Interestingly, this seems to work correctly:
proc p() =
var a = @[0, 1, 2, 3]
discard a.pop
var b = a # note the change from `let` to `var`
a.add(5)
echo a # @[0, 1, 2, 5]
echo b # @[0, 1, 2]
p()
Looks like an optimization gone wrong. Perhaps the intent was for the sharing to happen between two `let` s. [EDIT] Looks like Iscrd beat me to it.
