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Fix deferred cast checks using the wrong body for determining constness #148287
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                    fee1-dead
  
              
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r=me after
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  | // don't hold the borrow to deferred_cast_checks while checking to avoid borrow checker errors | ||
| // when writing to `self.param_env`. | 
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This seems to be outdated now; also do we still need to mem::take?
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    | @bors r=fee1-dead rollup | 
    
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Rollup of 3 pull requests Successful merges: - #148165 (Use `mut` less in dataflow analysis) - #148287 (Fix deferred cast checks using the wrong body for determining constness) - #148317 (bootstrap: Extract parts of `bootstrap::core::builder` into a `cli_paths` module) r? `@ghost` `@rustbot` modify labels: rollup
  
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re-introduces #103683
it was lost in 4fec845
deferred checks possibly have more such issues, needs investigation.
r? @fee1-dead