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added a minor note to destroyer.nim

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Andreas Rumpf 2017-10-10 11:26:29 +02:00
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compiler/destroyer.nim
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@ -39,6 +39,9 @@
## x = y where y is read only once
## is the same as: move(x, y)
##
## Actually the more general rule is: The *last* read of ``y``
## can become a move if ``y`` is the result of a construction.
##
## We also need to keep in mind here that the number of reads is
## control flow dependent:
## let x = foo()