Implement multiple patterns with | in if let and while let

src/libsyntax/ast.rs

@@ -1085,7 +1085,7 @@ pub enum ExprKind {
     /// `if let pat = expr { block } else { expr }`
     ///
     /// This is desugared to a `match` expression.
-    IfLet(P<Pat>, P<Expr>, P<Block>, Option<P<Expr>>),
+    IfLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<P<Expr>>),
     /// A while loop, with an optional label
     ///
     /// `'label: while expr { block }`
@@ -1095,7 +1095,7 @@ pub enum ExprKind {
     /// `'label: while let pat = expr { block }`
     ///
     /// This is desugared to a combination of `loop` and `match` expressions.
-    WhileLet(P<Pat>, P<Expr>, P<Block>, Option<Label>),
+    WhileLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<Label>),
     /// A for loop, with an optional label
     ///
     /// `'label: for pat in expr { block }`