syntax: make match arms store the expr directly.

Previously `ast::Arm` was always storing a single `ast::Expr` wrapped in an
`ast::Block` (for historical reasons, AIUI), so we might as just store
that expr directly.

Closes #3085.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 2edfd367f4e..d25d1a8cc35 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -765,5 +765,5 @@ pub fn walk_arm<E: Clone, V: Visitor<E>>(visitor: &mut V, arm: &Arm, env: E) {
         visitor.visit_pat(*pattern, env.clone())
     }
     walk_expr_opt(visitor, arm.guard, env.clone());
-    visitor.visit_block(arm.body, env)
+    visitor.visit_expr(arm.body, env)
 }