mark unique pointer parameters as noalias #6754
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The compiler guarantees that there are no other references to a unique pointer when it's passed by-value to a function.
The existence of the header and annihilator don't matter since it's not relevant to the call:
@graydon's tracing garbage collector stores the metadata outside of the boxes, so that won't be a problem. I'm unsure if updating the header while inside a function where it's marked as
noalias
would be a problem anyway since you never actually read or write to the header.@nikomatsakis: r?