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c1d722c1cf
remove unnecessary check for opaque types this isn't needed and may hide some errors. after analysis there are no opaque types so it's a noop anyways before analysis there are opaque types but due to `Reveal::UserFacing` we don't reveal them. `is_subtype` simply discards the opaque type constraints as these will get checked again during mir borrowck. r? types want to land this after the beta-cutoff as mir validator changes are apparently pretty scary