3 files changed, 37 insertions, 4 deletions

diff --git a/crates/ra_syntax/src/ast/edit.rs b/crates/ra_syntax/src/ast/edit.rs
index 95bf9db14..ae5d63927 100644
--- a/crates/ra_syntax/src/ast/edit.rs
+++ b/crates/ra_syntax/src/ast/edit.rs
@@ -104,7 +104,7 @@ impl ast::ItemList {
             }
         };
 
-        let indent = leading_indent(self.syntax()).unwrap_or("".into());
+        let indent = leading_indent(self.syntax()).unwrap_or_default();
         let ws = tokens::WsBuilder::new(&format!("\n{}", indent));
         let to_insert = iter::once(ws.ws().into());
         match existing_ws {
@@ -133,7 +133,7 @@ impl ast::RecordFieldList {
         let space = if is_multiline {
             ws = tokens::WsBuilder::new(&format!(
                 "\n{}    ",
-                leading_indent(self.syntax()).unwrap_or("".into())
+                leading_indent(self.syntax()).unwrap_or_default()
             ));
             ws.ws()
         } else {
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index c06076e3d..9f9d6e63c 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -312,6 +312,7 @@ impl AstNode for Block {
     }
 }
 impl ast::AttrsOwner for Block {}
+impl ast::ModuleItemOwner for Block {}
 impl Block {
     pub fn statements(&self) -> AstChildren<Stmt> {
         AstChildren::new(&self.syntax)
@@ -550,6 +551,36 @@ impl ConstDef {
     }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ConstParam {
+    pub(crate) syntax: SyntaxNode,
+}
+impl AstNode for ConstParam {
+    fn can_cast(kind: SyntaxKind) -> bool {
+        match kind {
+            CONST_PARAM => true,
+            _ => false,
+        }
+    }
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode {
+        &self.syntax
+    }
+}
+impl ast::NameOwner for ConstParam {}
+impl ast::AttrsOwner for ConstParam {}
+impl ast::TypeAscriptionOwner for ConstParam {}
+impl ConstParam {
+    pub fn default_val(&self) -> Option<Expr> {
+        AstChildren::new(&self.syntax).next()
+    }
+}
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct ContinueExpr {
     pub(crate) syntax: SyntaxNode,
 }
@@ -1425,6 +1456,9 @@ impl LambdaExpr {
     pub fn param_list(&self) -> Option<ParamList> {
         AstChildren::new(&self.syntax).next()
     }
+    pub fn ret_type(&self) -> Option<RetType> {
+        AstChildren::new(&self.syntax).next()
+    }
     pub fn body(&self) -> Option<Expr> {
         AstChildren::new(&self.syntax).next()
     }
diff --git a/crates/ra_syntax/src/ast/make.rs b/crates/ra_syntax/src/ast/make.rs
index 40db570da..04a5408fe 100644
--- a/crates/ra_syntax/src/ast/make.rs
+++ b/crates/ra_syntax/src/ast/make.rs
@@ -168,8 +168,7 @@ pub fn let_stmt(pattern: ast::Pat, initializer: Option<ast::Expr>) -> ast::LetSt
 
 fn ast_from_text<N: AstNode>(text: &str) -> N {
     let parse = SourceFile::parse(text);
-    let res = parse.tree().syntax().descendants().find_map(N::cast).unwrap();
-    res
+    parse.tree().syntax().descendants().find_map(N::cast).unwrap()
 }
 
 pub mod tokens {