Shallow resolve ty vars to their root var #147193
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Shallow resolve ty vars to their root var
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Finished benchmarking commit (dd7e4e9): comparison URL. Overall result: ❌✅ regressions and improvements - please read the text belowBenchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf. Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @bors rollup=never Instruction countOur most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.
Max RSS (memory usage)Results (primary -3.3%, secondary -2.5%)A less reliable metric. May be of interest, but not used to determine the overall result above.
CyclesResults (primary 2.7%, secondary -3.4%)A less reliable metric. May be of interest, but not used to determine the overall result above.
Binary sizeResults (primary 1.1%)A less reliable metric. May be of interest, but not used to determine the overall result above.
Bootstrap: 471.179s -> 471.5s (0.07%) |
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| // dynamic borrow errors on `self.inner`. | ||
| let known = self.inner.borrow_mut().type_variables().probe(v).known(); | ||
| known.map_or(ty, |t| self.shallow_resolve(t)) | ||
| known.map_or(Ty::new_var(self.tcx, self.root_var(v)), |t| { |
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Use map_or_else to only look up the root var if it's actually going to be used
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r? lcnr
just want to see CI