Auto merge of rust-lang#94121 - matthiaskrgr:rollup-6ps95da, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#92683 (Suggest copying trait associated type bounds on lifetime error)
 - rust-lang#92933 (Deny mixing bin crate type with lib crate types)
 - rust-lang#92959 (Add more info and suggestions to use of #[test] on invalid items)
 - rust-lang#93024 (Do not ICE when inlining a function with un-satisfiable bounds)
 - rust-lang#93613 (Move `{core,std}::stream::Stream` to `{core,std}::async_iter::AsyncIterator`)
 - rust-lang#93634 (compiler: clippy::complexity fixes)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast/src/attr/mod.rs

@@ -230,7 +230,7 @@ impl AttrItem {
     }
 
     pub fn meta_kind(&self) -> Option<MetaItemKind> {
-        Some(MetaItemKind::from_mac_args(&self.args)?)
+        MetaItemKind::from_mac_args(&self.args)
     }
 }
 

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -823,7 +823,7 @@ fn maybe_stage_features(sess: &Session, krate: &ast::Crate) {
             );
             let mut all_stable = true;
             for ident in
-                attr.meta_item_list().into_iter().flatten().map(|nested| nested.ident()).flatten()
+                attr.meta_item_list().into_iter().flatten().flat_map(|nested| nested.ident())
             {
                 let name = ident.name;
                 let stable_since = lang_features