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Rollup merge of #156172 - ShoyuVanilla:slowbro, r=lcnr
Implement a new flag `-Zdisable-fast-paths` in trait solving
Discussion: [#t-types/trait-system-refactor > ask for help @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/364551-t-types.2Ftrait-system-refactor/topic/ask.20for.20help/near/583953725)
r? lcnr
