Apply polymorphization to Instance
substitutions
#75336
Labels
-Zpolymorphize
Unstable option: Polymorphization.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
When #75255 landed, all
Instance
substitutions were polymorphized which enabled optimisation of the following test case:However, due to an oversight, it wasn't noticed that this made other tests and stage2 bootstrapping fail when polymorphisation was enabled (cursory investigation suggested regressions were related to #69925), so it was restricted in #75337 to cases that didn't result in regressions. We should investigate what we can do to re-enable this.
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