change the order of path suggestions

Author: TaKO8Ki

compiler/rustc_resolve/src/diagnostics.rs

@@ -1707,6 +1707,12 @@ crate fn show_candidates(
         candidates.iter().map(|c| path_names_to_string(&c.path)).collect();
 
     path_strings.sort();
+    let core_path_strings =
+        path_strings.iter().filter(|p| p.starts_with("core::")).cloned().collect::<Vec<String>>();
+    if !core_path_strings.is_empty() {
+        path_strings.retain(|p| !p.starts_with("core::"));
+    }
+    path_strings.extend(core_path_strings);
     path_strings.dedup();
 
     let (determiner, kind) = if candidates.len() == 1 {