attributes: force instrumented function to be FnOnce
#2892
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I've created #2897 to be merged into master and then backported to v0.1.x since that's the workflow here. |
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Closes #2857
Motivation
Functions which are
FnorFnMutfail to compile when they are instrumented with#[instrument(ret)]Solution
I've added a non-copy zst (
[&mut (), 0]) to the generated code that is moved inside the function so that it is forced to be no more thanFnOnce.