Address review comments part 1

crates/hir-def/src/attr.rs

@@ -1,5 +1,8 @@
 //! A higher level attributes based on TokenTree, with also some shortcuts.
 
+#[cfg(test)]
+mod tests;
+
 use std::{hash::Hash, ops, sync::Arc};
 
 use base_db::CrateId;
@@ -238,12 +241,12 @@ pub fn has_doc_hidden(&self) -> bool {
         })
     }
 
-    pub fn doc_exprs(&self) -> Vec<DocExpr> {
-        self.by_key("doc").tt_values().map(DocExpr::parse).collect()
+    pub fn doc_exprs(&self) -> impl Iterator<Item = DocExpr> + '_ {
+        self.by_key("doc").tt_values().map(DocExpr::parse)
     }
 
-    pub fn doc_aliases(&self) -> Vec<SmolStr> {
-        self.doc_exprs().into_iter().flat_map(|doc_expr| doc_expr.aliases()).collect()
+    pub fn doc_aliases(&self) -> impl Iterator<Item = SmolStr> + '_ {
+        self.doc_exprs().flat_map(|doc_expr| doc_expr.aliases().to_vec())
     }
 
     pub fn is_proc_macro(&self) -> bool {
@@ -288,17 +291,17 @@ fn from(atom: DocAtom) -> Self {
 }
 
 impl DocExpr {
-    pub fn parse<S>(tt: &tt::Subtree<S>) -> DocExpr {
+    fn parse<S>(tt: &tt::Subtree<S>) -> DocExpr {
         next_doc_expr(&mut tt.token_trees.iter()).unwrap_or(DocExpr::Invalid)
     }
 
-    pub fn aliases(self) -> Vec<SmolStr> {
+    pub fn aliases(&self) -> &[SmolStr] {
         match self {
             DocExpr::Atom(DocAtom::KeyValue { key, value }) if key == "alias" => {
-                vec![value]
+                std::slice::from_ref(value)
             }
             DocExpr::Alias(aliases) => aliases,
-            _ => vec![],
+            _ => &[],
         }
     }
 }

crates/hir-def/src/lib.rs

@@ -53,8 +53,6 @@ macro_rules! eprintln {
 mod test_db;
 #[cfg(test)]
 mod macro_expansion_tests;
-#[cfg(test)]
-mod attr_tests;
 mod pretty;
 
 use std::{

crates/ide-completion/src/context.rs

@@ -549,7 +549,7 @@ fn is_doc_hidden(&self, attrs: &hir::Attrs, defining_crate: hir::Crate) -> bool
 
     fn doc_aliases(&self, scope_def: ScopeDef) -> Vec<SmolStr> {
         if let Some(attrs) = scope_def.attrs(self.db) {
-            attrs.doc_aliases()
+            attrs.doc_aliases().collect()
         } else {
             vec![]
         }

crates/ide-completion/src/item.rs

@@ -45,7 +45,7 @@ pub struct CompletionItem {
     ///
     /// That is, in `foo.bar$0` lookup of `abracadabra` will be accepted (it
     /// contains `bar` sub sequence), and `quux` will rejected.
-    pub lookup: Option<SmolStr>,
+    pub lookup: SmolStr,
 
     /// Additional info to show in the UI pop up.
     pub detail: Option<String>,
@@ -359,7 +359,7 @@ pub(crate) fn new(
 
     /// What string is used for filtering.
     pub fn lookup(&self) -> &str {
-        self.lookup.as_deref().unwrap_or(&self.label)
+        self.lookup.as_str()
     }
 
     pub fn ref_match(&self) -> Option<(String, text_edit::Indel, CompletionRelevance)> {
@@ -415,19 +415,20 @@ pub(crate) fn build(self) -> CompletionItem {
         let _p = profile::span("item::Builder::build");
 
         let mut label = self.label;
-        let mut lookup = self.lookup;
+        let mut lookup = self.lookup.unwrap_or_else(|| label.clone());
         let insert_text = self.insert_text.unwrap_or_else(|| label.to_string());
 
+        if let Some(doc_aliases) = self.doc_aliases {
+            label = SmolStr::from(format!("{label} (alias {doc_aliases})"));
+            lookup = SmolStr::from(format!("{lookup} {doc_aliases}"));
+        }
         if let [import_edit] = &*self.imports_to_add {
             // snippets can have multiple imports, but normal completions only have up to one
             if let Some(original_path) = import_edit.original_path.as_ref() {
-                lookup = lookup.or_else(|| Some(label.clone()));
                 label = SmolStr::from(format!("{label} (use {original_path})"));
             }
         } else if let Some(trait_name) = self.trait_name {
             label = SmolStr::from(format!("{label} (as {trait_name})"));
-        } else if let Some(doc_aliases) = self.doc_aliases {
-            label = SmolStr::from(format!("{label} (alias {doc_aliases})"));
         }
 
         let text_edit = match self.text_edit {