Merge #7974

7974: use references in CompletionItem's builder r=matklad a=yonip23

@matklad 
This is a follow up to [this pr](https://github.com/rust-analyzer/rust-analyzer/pull/7973)

Co-authored-by: yonip23 <[email protected]>

8 files changed, 86 insertions, 79 deletions

diff --git a/crates/ide_completion/src/completions/attribute.rs b/crates/ide_completion/src/completions/attribute.rs
index cb05e85fc..14376b924 100644
--- a/crates/ide_completion/src/completions/attribute.rs
+++ b/crates/ide_completion/src/completions/attribute.rs
@@ -45,15 +45,15 @@ fn complete_attribute_start(acc: &mut Completions, ctx: &CompletionContext, attr
             CompletionKind::Attribute,
             ctx.source_range(),
             attr_completion.label,
-        )
-        .kind(CompletionItemKind::Attribute);
+        );
+        item.kind(CompletionItemKind::Attribute);
 
         if let Some(lookup) = attr_completion.lookup {
-            item = item.lookup_by(lookup);
+            item.lookup_by(lookup);
         }
 
         if let Some((snippet, cap)) = attr_completion.snippet.zip(ctx.config.snippet_cap) {
-            item = item.insert_snippet(cap, snippet);
+            item.insert_snippet(cap, snippet);
         }
 
         if attribute.kind() == ast::AttrKind::Inner || !attr_completion.prefer_inner {
@@ -168,16 +168,20 @@ fn complete_derive(acc: &mut Completions, ctx: &CompletionContext, derive_input:
             );
             let lookup = components.join(", ");
             let label = components.iter().rev().join(", ");
-            CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label)
-                .lookup_by(lookup)
-                .kind(CompletionItemKind::Attribute)
-                .add_to(acc)
+            let mut builder =
+                CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label);
+            builder.lookup_by(lookup).kind(CompletionItemKind::Attribute);
+            builder.add_to(acc);
         }
 
         for custom_derive_name in get_derive_names_in_scope(ctx).difference(&existing_derives) {
-            CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), custom_derive_name)
-                .kind(CompletionItemKind::Attribute)
-                .add_to(acc)
+            let mut builder = CompletionItem::new(
+                CompletionKind::Attribute,
+                ctx.source_range(),
+                custom_derive_name,
+            );
+            builder.kind(CompletionItemKind::Attribute);
+            builder.add_to(acc);
         }
     }
 }
@@ -193,14 +197,13 @@ fn complete_lint(
             .into_iter()
             .filter(|completion| !existing_lints.contains(completion.label))
         {
-            CompletionItem::new(
+            let mut builder = CompletionItem::new(
                 CompletionKind::Attribute,
                 ctx.source_range(),
                 lint_completion.label,
-            )
-            .kind(CompletionItemKind::Attribute)
-            .detail(lint_completion.description)
-            .add_to(acc)
+            );
+            builder.kind(CompletionItemKind::Attribute).detail(lint_completion.description);
+            builder.add_to(acc)
         }
     }
 }
diff --git a/crates/ide_completion/src/completions/fn_param.rs b/crates/ide_completion/src/completions/fn_param.rs
index 1bcc8727f..9600a049a 100644
--- a/crates/ide_completion/src/completions/fn_param.rs
+++ b/crates/ide_completion/src/completions/fn_param.rs
@@ -54,10 +54,9 @@ pub(crate) fn complete_fn_param(acc: &mut Completions, ctx: &CompletionContext)
     }
 
     params.into_iter().for_each(|(label, lookup)| {
-        CompletionItem::new(CompletionKind::Magic, ctx.source_range(), label)
-            .kind(CompletionItemKind::Binding)
-            .lookup_by(lookup)
-            .add_to(acc)
+        let mut builder = CompletionItem::new(CompletionKind::Magic, ctx.source_range(), label);
+        builder.kind(CompletionItemKind::Binding).lookup_by(lookup);
+        builder.add_to(acc)
     });
 }
 
diff --git a/crates/ide_completion/src/completions/keyword.rs b/crates/ide_completion/src/completions/keyword.rs
index 80aa9fb06..aa3be712d 100644
--- a/crates/ide_completion/src/completions/keyword.rs
+++ b/crates/ide_completion/src/completions/keyword.rs
@@ -12,21 +12,21 @@ pub(crate) fn complete_use_tree_keyword(acc: &mut Completions, ctx: &CompletionC
 
     if ctx.use_item_syntax.is_some() {
         if ctx.path_qual.is_none() {
-            CompletionItem::new(CompletionKind::Keyword, source_range, "crate::")
-                .kind(CompletionItemKind::Keyword)
-                .insert_text("crate::")
-                .add_to(acc);
+            let mut crate_builder =
+                CompletionItem::new(CompletionKind::Keyword, source_range, "crate::");
+            crate_builder.kind(CompletionItemKind::Keyword).insert_text("crate::");
+            crate_builder.add_to(acc);
         }
-        CompletionItem::new(CompletionKind::Keyword, source_range, "self")
-            .kind(CompletionItemKind::Keyword)
-            .add_to(acc);
+        let mut self_builder = CompletionItem::new(CompletionKind::Keyword, source_range, "self");
+        self_builder.kind(CompletionItemKind::Keyword);
+        self_builder.add_to(acc);
         if iter::successors(ctx.path_qual.clone(), |p| p.qualifier())
             .all(|p| p.segment().and_then(|s| s.super_token()).is_some())
         {
-            CompletionItem::new(CompletionKind::Keyword, source_range, "super::")
-                .kind(CompletionItemKind::Keyword)
-                .insert_text("super::")
-                .add_to(acc);
+            let mut super_builder =
+                CompletionItem::new(CompletionKind::Keyword, source_range, "super::");
+            super_builder.kind(CompletionItemKind::Keyword).insert_text("super::");
+            super_builder.add_to(acc);
         }
     }
 
@@ -34,11 +34,10 @@ pub(crate) fn complete_use_tree_keyword(acc: &mut Completions, ctx: &CompletionC
     if let Some(receiver) = &ctx.dot_receiver {
         if let Some(ty) = ctx.sema.type_of_expr(receiver) {
             if ty.impls_future(ctx.db) {
-                CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), "await")
-                    .kind(CompletionItemKind::Keyword)
-                    .detail("expr.await")
-                    .insert_text("await")
-                    .add_to(acc);
+                let mut builder =
+                    CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), "await");
+                builder.kind(CompletionItemKind::Keyword).detail("expr.await").insert_text("await");
+                builder.add_to(acc);
             }
         };
     }
@@ -165,9 +164,10 @@ pub(crate) fn complete_expr_keyword(acc: &mut Completions, ctx: &CompletionConte
 }
 
 fn add_keyword(ctx: &CompletionContext, acc: &mut Completions, kw: &str, snippet: &str) {
-    let builder = CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), kw)
-        .kind(CompletionItemKind::Keyword);
-    let builder = match ctx.config.snippet_cap {
+    let mut builder = CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), kw);
+    builder.kind(CompletionItemKind::Keyword);
+
+    match ctx.config.snippet_cap {
         Some(cap) => {
             let tmp;
             let snippet = if snippet.ends_with('}') && ctx.incomplete_let {
@@ -177,9 +177,11 @@ fn add_keyword(ctx: &CompletionContext, acc: &mut Completions, kw: &str, snippet
             } else {
                 snippet
             };
-            builder.insert_snippet(cap, snippet)
+            builder.insert_snippet(cap, snippet);
+        }
+        None => {
+            builder.insert_text(if snippet.contains('$') { kw } else { snippet });
         }
-        None => builder.insert_text(if snippet.contains('$') { kw } else { snippet }),
     };
     acc.add(builder.build());
 }
diff --git a/crates/ide_completion/src/completions/mod_.rs b/crates/ide_completion/src/completions/mod_.rs
index 352fc7c77..fc4ac7a0d 100644
--- a/crates/ide_completion/src/completions/mod_.rs
+++ b/crates/ide_completion/src/completions/mod_.rs
@@ -80,9 +80,10 @@ pub(crate) fn complete_mod(acc: &mut Completions, ctx: &CompletionContext) -> Op
             if mod_under_caret.semicolon_token().is_none() {
                 label.push(';');
             }
-            CompletionItem::new(CompletionKind::Magic, ctx.source_range(), &label)
-                .kind(SymbolKind::Module)
-                .add_to(acc)
+            let mut builder =
+                CompletionItem::new(CompletionKind::Magic, ctx.source_range(), &label);
+            builder.kind(SymbolKind::Module);
+            builder.add_to(acc)
         });
 
     Some(())
diff --git a/crates/ide_completion/src/completions/postfix.rs b/crates/ide_completion/src/completions/postfix.rs
index d45ad7944..8551e0168 100644
--- a/crates/ide_completion/src/completions/postfix.rs
+++ b/crates/ide_completion/src/completions/postfix.rs
@@ -301,6 +301,7 @@ fn postfix_snippet(
         .detail(detail)
         .kind(CompletionItemKind::Snippet)
         .snippet_edit(cap, edit)
+        .clone()
 }
 
 #[cfg(test)]
diff --git a/crates/ide_completion/src/completions/record.rs b/crates/ide_completion/src/completions/record.rs
index 0a7927eb8..b9af09698 100644
--- a/crates/ide_completion/src/completions/record.rs
+++ b/crates/ide_completion/src/completions/record.rs
@@ -22,16 +22,13 @@ pub(crate) fn complete_record(acc: &mut Completions, ctx: &CompletionContext) ->
                 let completion_text = completion_text
                     .strip_prefix(ctx.token.to_string().as_str())
                     .unwrap_or(completion_text);
-                acc.add(
-                    CompletionItem::new(
-                        CompletionKind::Snippet,
-                        ctx.source_range(),
-                        "..Default::default()",
-                    )
-                    .insert_text(completion_text)
-                    .kind(SymbolKind::Field)
-                    .build(),
+                let mut builder = CompletionItem::new(
+                    CompletionKind::Snippet,
+                    ctx.source_range(),
+                    "..Default::default()",
                 );
+                builder.insert_text(completion_text).kind(SymbolKind::Field);
+                acc.add(builder.build());
             }
 
             missing_fields
diff --git a/crates/ide_completion/src/completions/snippet.rs b/crates/ide_completion/src/completions/snippet.rs
index df17a15c5..a4d18cecd 100644
--- a/crates/ide_completion/src/completions/snippet.rs
+++ b/crates/ide_completion/src/completions/snippet.rs
@@ -8,9 +8,8 @@ use crate::{
 };
 
 fn snippet(ctx: &CompletionContext, cap: SnippetCap, label: &str, snippet: &str) -> Builder {
-    CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), label)
-        .insert_snippet(cap, snippet)
-        .kind(CompletionItemKind::Snippet)
+    let mut builder = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), label);
+    builder.insert_snippet(cap, snippet).kind(CompletionItemKind::Snippet).clone()
 }
 
 pub(crate) fn complete_expr_snippet(acc: &mut Completions, ctx: &CompletionContext) {
@@ -35,7 +34,7 @@ pub(crate) fn complete_item_snippet(acc: &mut Completions, ctx: &CompletionConte
         None => return,
     };
 
-    snippet(
+    let mut test_module_builder = snippet(
         ctx,
         cap,
         "tmod (Test module)",
@@ -49,11 +48,11 @@ mod tests {
         $0
     }
 }",
-    )
-    .lookup_by("tmod")
-    .add_to(acc);
+    );
+    test_module_builder.lookup_by("tmod");
+    test_module_builder.add_to(acc);
 
-    snippet(
+    let mut test_function_builder = snippet(
         ctx,
         cap,
         "tfn (Test function)",
@@ -62,11 +61,13 @@ mod tests {
 fn ${1:feature}() {
     $0
 }",
-    )
-    .lookup_by("tfn")
-    .add_to(acc);
+    );
+    test_function_builder.lookup_by("tfn");
+    test_function_builder.add_to(acc);
 
-    snippet(ctx, cap, "macro_rules", "macro_rules! $1 {\n\t($2) => {\n\t\t$0\n\t};\n}").add_to(acc);
+    let macro_rules_builder =
+        snippet(ctx, cap, "macro_rules", "macro_rules! $1 {\n\t($2) => {\n\t\t$0\n\t};\n}");
+    macro_rules_builder.add_to(acc);
 }
 
 #[cfg(test)]
diff --git a/crates/ide_completion/src/completions/trait_impl.rs b/crates/ide_completion/src/completions/trait_impl.rs
index b999540b8..031f42d4a 100644
--- a/crates/ide_completion/src/completions/trait_impl.rs
+++ b/crates/ide_completion/src/completions/trait_impl.rs
@@ -145,9 +145,8 @@ fn add_function_impl(
         format!("fn {}(..)", fn_name)
     };
 
-    let builder = CompletionItem::new(CompletionKind::Magic, ctx.source_range(), label)
-        .lookup_by(fn_name)
-        .set_documentation(func.docs(ctx.db));
+    let mut builder = CompletionItem::new(CompletionKind::Magic, ctx.source_range(), label);
+    builder.lookup_by(fn_name).set_documentation(func.docs(ctx.db));
 
     let completion_kind = if func.self_param(ctx.db).is_some() {
         CompletionItemKind::Method
@@ -161,15 +160,15 @@ fn add_function_impl(
         match ctx.config.snippet_cap {
             Some(cap) => {
                 let snippet = format!("{} {{\n    $0\n}}", function_decl);
-                builder.snippet_edit(cap, TextEdit::replace(range, snippet))
+                builder.snippet_edit(cap, TextEdit::replace(range, snippet));
             }
             None => {
                 let header = format!("{} {{", function_decl);
-                builder.text_edit(TextEdit::replace(range, header))
+                builder.text_edit(TextEdit::replace(range, header));
             }
-        }
-        .kind(completion_kind)
-        .add_to(acc);
+        };
+        builder.kind(completion_kind);
+        builder.add_to(acc);
     }
 }
 
@@ -185,12 +184,14 @@ fn add_type_alias_impl(
 
     let range = TextRange::new(type_def_node.text_range().start(), ctx.source_range().end());
 
-    CompletionItem::new(CompletionKind::Magic, ctx.source_range(), snippet.clone())
+    let mut builder =
+        CompletionItem::new(CompletionKind::Magic, ctx.source_range(), snippet.clone());
+    builder
         .text_edit(TextEdit::replace(range, snippet))
         .lookup_by(alias_name)
         .kind(SymbolKind::TypeAlias)
-        .set_documentation(type_alias.docs(ctx.db))
-        .add_to(acc);
+        .set_documentation(type_alias.docs(ctx.db));
+    builder.add_to(acc);
 }
 
 fn add_const_impl(
@@ -208,12 +209,14 @@ fn add_const_impl(
             let range =
                 TextRange::new(const_def_node.text_range().start(), ctx.source_range().end());
 
-            CompletionItem::new(CompletionKind::Magic, ctx.source_range(), snippet.clone())
+            let mut builder =
+                CompletionItem::new(CompletionKind::Magic, ctx.source_range(), snippet.clone());
+            builder
                 .text_edit(TextEdit::replace(range, snippet))
                 .lookup_by(const_name)
                 .kind(SymbolKind::Const)
-                .set_documentation(const_.docs(ctx.db))
-                .add_to(acc);
+                .set_documentation(const_.docs(ctx.db));
+            builder.add_to(acc);
         }
     }
 }