2 files changed, 12 insertions, 10 deletions

diff --git a/crates/ra_syntax/src/ast/make.rs b/crates/ra_syntax/src/ast/make.rs
index dbf8e6370..0c908573d 100644
--- a/crates/ra_syntax/src/ast/make.rs
+++ b/crates/ra_syntax/src/ast/make.rs
@@ -1,6 +1,7 @@
 //! This module contains free-standing functions for creating AST fragments out
 //! of smaller pieces.
 use itertools::Itertools;
+use stdx::format_to;
 
 use crate::{ast, AstNode, SourceFile, SyntaxKind, SyntaxNode, SyntaxToken};
 
@@ -34,14 +35,14 @@ pub fn use_tree(
     let mut buf = "use ".to_string();
     buf += &path.syntax().to_string();
     if let Some(use_tree_list) = use_tree_list {
-        buf += &format!("::{}", use_tree_list);
+        format_to!(buf, "::{}", use_tree_list);
     }
     if add_star {
         buf += "::*";
     }
 
     if let Some(alias) = alias {
-        buf += &format!(" {}", alias);
+        format_to!(buf, " {}", alias);
     }
     ast_from_text(&buf)
 }
@@ -70,15 +71,15 @@ pub fn block_expr(
     stmts: impl IntoIterator<Item = ast::Stmt>,
     tail_expr: Option<ast::Expr>,
 ) -> ast::BlockExpr {
-    let mut text = "{\n".to_string();
+    let mut buf = "{\n".to_string();
     for stmt in stmts.into_iter() {
-        text += &format!("    {}\n", stmt);
+        format_to!(buf, "    {}\n", stmt);
     }
     if let Some(tail_expr) = tail_expr {
-        text += &format!("    {}\n", tail_expr)
+        format_to!(buf, "    {}\n", tail_expr)
     }
-    text += "}";
-    ast_from_text(&format!("fn f() {}", text))
+    buf += "}";
+    ast_from_text(&format!("fn f() {}", buf))
 }
 
 pub fn block_from_expr(e: ast::Expr) -> ast::Block {
diff --git a/crates/ra_syntax/src/lib.rs b/crates/ra_syntax/src/lib.rs
index cef926ed3..f0e16dc2b 100644
--- a/crates/ra_syntax/src/lib.rs
+++ b/crates/ra_syntax/src/lib.rs
@@ -32,9 +32,10 @@ pub mod ast;
 #[doc(hidden)]
 pub mod fuzz;
 
-use std::{fmt::Write, marker::PhantomData, sync::Arc};
+use std::{marker::PhantomData, sync::Arc};
 
 use ra_text_edit::AtomTextEdit;
+use stdx::format_to;
 
 use crate::syntax_node::GreenNode;
 
@@ -115,7 +116,7 @@ impl Parse<SourceFile> {
     pub fn debug_dump(&self) -> String {
         let mut buf = format!("{:#?}", self.tree().syntax());
         for err in self.errors.iter() {
-            writeln!(buf, "error {:?}: {}", err.range(), err).unwrap();
+            format_to!(buf, "error {:?}: {}\n", err.range(), err);
         }
         buf
     }
@@ -296,7 +297,7 @@ fn api_walkthrough() {
                     NodeOrToken::Node(it) => it.text().to_string(),
                     NodeOrToken::Token(it) => it.text().to_string(),
                 };
-                buf += &format!("{:indent$}{:?} {:?}\n", " ", text, node.kind(), indent = indent);
+                format_to!(buf, "{:indent$}{:?} {:?}\n", " ", text, node.kind(), indent = indent);
                 indent += 2;
             }
             WalkEvent::Leave(_) => indent -= 2,