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A comment on The compiler will optimize that away. Parent comment

Re:The compiler will optimize that away by teh_matt on Sunday May 02, 2021 @05:14AM (#27013605)
I hacked up something similar (https://gitlab.com/mbryant/functiontrace/-/blob/master/src/p...) a while ago. Your variant looks much more useful!
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Re:The compiler will optimize that away by conradludgate on Sunday May 02, 2021 @07:07AM (#27014109)
Yeah I'm a big fan of proc-macros. If utilised well, it can do some really great things
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