Merge pull request rust-lang#18388 from jaboatman/master

Fix checking for `false` `labelDetailsSupport` value.

Author: lnicola

src/tools/rust-analyzer/crates/rust-analyzer/src/lsp/capabilities.rs

@@ -210,9 +210,7 @@ impl ClientCapabilities {
                 .completion_item
                 .as_ref()?
                 .label_details_support
-                .as_ref()
-        })()
-        .is_some()
+        })() == Some(true)
     }
 
     fn completion_item(&self) -> Option<CompletionOptionsCompletionItem> {