2 files changed, 19 insertions, 20 deletions

diff --git a/crates/ra_ide/src/completion/complete_snippet.rs b/crates/ra_ide/src/completion/complete_snippet.rs
index 28d8f7876..4368e4eec 100644
--- a/crates/ra_ide/src/completion/complete_snippet.rs
+++ b/crates/ra_ide/src/completion/complete_snippet.rs
@@ -36,7 +36,7 @@ pub(super) fn complete_item_snippet(acc: &mut Completions, ctx: &CompletionConte
     snippet(
         ctx,
         cap,
-        "Test module",
+        "tmod (Test module)",
         "\
 #[cfg(test)]
 mod tests {
@@ -54,7 +54,7 @@ mod tests {
     snippet(
         ctx,
         cap,
-        "Test function",
+        "tfn (Test function)",
         "\
 #[test]
 fn ${1:feature}() {
@@ -106,10 +106,10 @@ mod tests {
 }
 "#,
             expect![[r#"
-                sn Test function
-                sn Test module
                 sn macro_rules
                 sn pub(crate)
+                sn tfn (Test function)
+                sn tmod (Test module)
             "#]],
         )
     }
diff --git a/crates/ra_ide/src/completion/presentation.rs b/crates/ra_ide/src/completion/presentation.rs
index 9a94ff476..59f1b1424 100644
--- a/crates/ra_ide/src/completion/presentation.rs
+++ b/crates/ra_ide/src/completion/presentation.rs
@@ -2,8 +2,8 @@
 //! It also handles scoring (sorting) completions.
 
 use hir::{Docs, HasAttrs, HasSource, HirDisplay, ModPath, ScopeDef, StructKind, Type};
+use itertools::Itertools;
 use ra_syntax::ast::NameOwner;
-use stdx::SepBy;
 use test_utils::mark;
 
 use crate::{
@@ -289,16 +289,16 @@ impl Completions {
             .map(|field| (field.name(ctx.db), field.signature_ty(ctx.db)));
         let variant_kind = variant.kind(ctx.db);
         let detail = match variant_kind {
-            StructKind::Tuple | StructKind::Unit => detail_types
-                .map(|(_, t)| t.display(ctx.db).to_string())
-                .sep_by(", ")
-                .surround_with("(", ")")
-                .to_string(),
-            StructKind::Record => detail_types
-                .map(|(n, t)| format!("{}: {}", n, t.display(ctx.db).to_string()))
-                .sep_by(", ")
-                .surround_with("{ ", " }")
-                .to_string(),
+            StructKind::Tuple | StructKind::Unit => format!(
+                "({})",
+                detail_types.map(|(_, t)| t.display(ctx.db).to_string()).format(", ")
+            ),
+            StructKind::Record => format!(
+                "{{ {} }}",
+                detail_types
+                    .map(|(n, t)| format!("{}: {}", n, t.display(ctx.db).to_string()))
+                    .format(", ")
+            ),
         };
         let mut res = CompletionItem::new(
             CompletionKind::Reference,
@@ -412,11 +412,10 @@ impl Builder {
             self = self.trigger_call_info();
             let snippet = match (ctx.config.add_call_argument_snippets, params) {
                 (true, Params::Named(params)) => {
-                    let function_params_snippet = params
-                        .iter()
-                        .enumerate()
-                        .map(|(index, param_name)| format!("${{{}:{}}}", index + 1, param_name))
-                        .sep_by(", ");
+                    let function_params_snippet =
+                        params.iter().enumerate().format_with(", ", |(index, param_name), f| {
+                            f(&format_args!("${{{}:{}}}", index + 1, param_name))
+                        });
                     format!("{}({})$0", name, function_params_snippet)
                 }
                 _ => {