Move placeholder handling to a proper preprocessing step #140466
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This commit breaks out the logic of placheolder rewriting into its own preprocessing step. It's one of the more boring parts of rust-lang#130227. The only functional change from this is that the preprocessing step (where extra `r: 'static` constraints are added) is performed upstream of Polonius legacy, finally affecting Polonius. That is mostly a by-product, though.
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This commit breaks out the logic of placheolder rewriting into its own preprocessing step. It's one of the more boring
parts of #130227.
The only functional change from this is that the preprocessing step (where extra
r: 'staticconstraints are added) is performed upstream of Polonius legacy, finally affecting Polonius. That is mostly a by-product, though.This should be reviewable by anyone in the compiler team, so
r? rust-lang/compiler
I am marking this as WIP because in order for it to not interfere with my own in-review PR, I have based it on the branch of #139965. It should be reviewable despite this though.