Rollup merge of #154363 - aerooneqq:nested-delegations, r=petrochenkov delegation: fix zero-args nested delegation ICE This PR fixes an ICE when during lowering of nested delegation we need to access information about its parent, who is also inside body of another delegation. As a fix we lower delegation body even if there are no arguments in signature function, in this case we will see an error `this function takes 0 arguments but 1 argument was supplied`. Fixes rust-lang/rust#154332. Part of rust-lang/rust#118212. r? @petrochenkov
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