3 files changed, 41 insertions, 56 deletions

diff --git a/crates/libsyntax2/src/ast/generated.rs b/crates/libsyntax2/src/ast/generated.rs
index 7a2a9c7d4..a4b116941 100644
--- a/crates/libsyntax2/src/ast/generated.rs
+++ b/crates/libsyntax2/src/ast/generated.rs
@@ -1,9 +1,11 @@
 use std::sync::Arc;
 use {
+    ast,
     SyntaxNode, SyntaxRoot, TreeRoot, AstNode,
     SyntaxKind::*,
 };
 
+// ConstItem
 #[derive(Debug, Clone, Copy)]
 pub struct ConstItem<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -19,15 +21,10 @@ impl<R: TreeRoot> AstNode<R> for ConstItem<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> ConstItem<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for ConstItem<R> {}
+impl<R: TreeRoot> ConstItem<R> {}
 
+// Enum
 #[derive(Debug, Clone, Copy)]
 pub struct Enum<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -43,15 +40,10 @@ impl<R: TreeRoot> AstNode<R> for Enum<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> Enum<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for Enum<R> {}
+impl<R: TreeRoot> Enum<R> {}
 
+// File
 #[derive(Debug, Clone, Copy)]
 pub struct File<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -75,6 +67,7 @@ impl<R: TreeRoot> File<R> {
     }
 }
 
+// Function
 #[derive(Debug, Clone, Copy)]
 pub struct Function<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -90,15 +83,10 @@ impl<R: TreeRoot> AstNode<R> for Function<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> Function<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for Function<R> {}
+impl<R: TreeRoot> Function<R> {}
 
+// Module
 #[derive(Debug, Clone, Copy)]
 pub struct Module<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -114,15 +102,10 @@ impl<R: TreeRoot> AstNode<R> for Module<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> Module<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for Module<R> {}
+impl<R: TreeRoot> Module<R> {}
 
+// Name
 #[derive(Debug, Clone, Copy)]
 pub struct Name<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -140,6 +123,7 @@ impl<R: TreeRoot> AstNode<R> for Name<R> {
 
 impl<R: TreeRoot> Name<R> {}
 
+// StaticItem
 #[derive(Debug, Clone, Copy)]
 pub struct StaticItem<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -155,15 +139,10 @@ impl<R: TreeRoot> AstNode<R> for StaticItem<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> StaticItem<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for StaticItem<R> {}
+impl<R: TreeRoot> StaticItem<R> {}
 
+// Struct
 #[derive(Debug, Clone, Copy)]
 pub struct Struct<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -179,15 +158,10 @@ impl<R: TreeRoot> AstNode<R> for Struct<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> Struct<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for Struct<R> {}
+impl<R: TreeRoot> Struct<R> {}
 
+// Trait
 #[derive(Debug, Clone, Copy)]
 pub struct Trait<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -203,12 +177,6 @@ impl<R: TreeRoot> AstNode<R> for Trait<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
-impl<R: TreeRoot> Trait<R> {
-    pub fn name(&self) -> Option<Name<R>> {
-        self.syntax()
-            .children()
-            .filter_map(Name::cast)
-            .next()
-    }
-}
+impl<R: TreeRoot> ast::NameOwner<R> for Trait<R> {}
+impl<R: TreeRoot> Trait<R> {}
 
diff --git a/crates/libsyntax2/src/ast/generated.rs.tera b/crates/libsyntax2/src/ast/generated.rs.tera
index 86b8b05d1..3d79b5543 100644
--- a/crates/libsyntax2/src/ast/generated.rs.tera
+++ b/crates/libsyntax2/src/ast/generated.rs.tera
@@ -1,9 +1,11 @@
 use std::sync::Arc;
 use {
+    ast,
     SyntaxNode, SyntaxRoot, TreeRoot, AstNode,
     SyntaxKind::*,
 };
 {% for node, methods in ast %}
+// {{ node }}
 #[derive(Debug, Clone, Copy)]
 pub struct {{ node }}<R: TreeRoot = Arc<SyntaxRoot>> {
     syntax: SyntaxNode<R>,
@@ -19,6 +21,12 @@ impl<R: TreeRoot> AstNode<R> for {{ node }}<R> {
     fn syntax(&self) -> &SyntaxNode<R> { &self.syntax }
 }
 
+{% if methods.traits -%}
+{%- for t in methods.traits -%}
+impl<R: TreeRoot> ast::{{ t }}<R> for {{ node }}<R> {}
+{% endfor -%}
+{%- endif -%}
+
 impl<R: TreeRoot> {{ node }}<R> {
 {%- if methods.collections -%}
 {%- for m in methods.collections -%}
diff --git a/crates/libsyntax2/src/ast/mod.rs b/crates/libsyntax2/src/ast/mod.rs
index 7d3cdb93d..56bc099fe 100644
--- a/crates/libsyntax2/src/ast/mod.rs
+++ b/crates/libsyntax2/src/ast/mod.rs
@@ -12,6 +12,15 @@ pub trait AstNode<R: TreeRoot>: Sized {
     fn syntax(&self) -> &SyntaxNode<R>;
 }
 
+pub trait NameOwner<R: TreeRoot>: AstNode<R> {
+    fn name(&self) -> Option<Name<R>> {
+        self.syntax()
+            .children()
+            .filter_map(Name::cast)
+            .next()
+    }
+}
+
 impl File<Arc<SyntaxRoot>> {
     pub fn parse(text: &str) -> Self {
         File::cast(::parse(text)).unwrap()