add trait aliases to AST

2017-10-02 12:27:45 +00:00
parent 8624ea5117
commit d4a28268cc
8 changed files with 134 additions and 14 deletions
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -1929,6 +1929,10 @@ pub enum ItemKind {
    ///
    /// E.g. `trait Foo { .. }`, `trait Foo<T> { .. }` or `auto trait Foo {}`
    Trait(IsAuto, Unsafety, Generics, TyParamBounds, Vec<TraitItem>),
+    /// Trait alias
+    ///
+    /// E.g. `trait Foo = Bar + Quux;`
+    TraitAlias(Generics, TyParamBounds),
    /// Auto trait implementation.
    ///
    /// E.g. `impl Trait for .. {}` or `impl<T> Trait<T> for .. {}`
@@ -1968,6 +1972,7 @@ impl ItemKind {
            ItemKind::Struct(..) => "struct",
            ItemKind::Union(..) => "union",
            ItemKind::Trait(..) => "trait",
+            ItemKind::TraitAlias(..) => "trait alias",
            ItemKind::Mac(..) |
            ItemKind::MacroDef(..) |
            ItemKind::Impl(..) |