Auto merge of #53272 - mark-i-m:anon_param_error_now, r=nikomatsakis
Warn on anon params in 2015 edition cc #41686 https://github.com/rust-lang/rfcs/pull/2522 cc @Centril @nikomatsakis TODO: - [x] Make sure the tests pass. - [x] Make sure there is rustfix-able suggestion. Current plan is to just suggest `_ : Foo` - [x] Add a rustfix ui test. EDIT: It seems I already did the last two in #48309
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