Some cleanup of no longer used AST things

src/libsyntax/ast.rs

@@ -855,9 +855,8 @@ pub enum Expr_ {
     ///
     /// `'label: loop { block }`
     ExprLoop(P<Block>, Option<Ident>),
-    /// A `match` block, with a source that indicates whether or not it is
-    /// the result of a desugaring, and if so, which kind.
-    ExprMatch(P<Expr>, Vec<Arm>, MatchSource),
+    /// A `match` block.
+    ExprMatch(P<Expr>, Vec<Arm>),
     /// A closure (for example, `move |a, b, c| {a + b + c}`)
     ExprClosure(CaptureClause, P<FnDecl>, P<Block>),
     /// A block (`{ ... }`)
@@ -936,14 +935,6 @@ pub struct QSelf {
     pub position: usize
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
-pub enum MatchSource {
-    Normal,
-    IfLetDesugar { contains_else_clause: bool },
-    WhileLetDesugar,
-    ForLoopDesugar,
-}
-
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum CaptureClause {
     CaptureByValue,