Fix AST visitor

schala-lang/language/src/ast/visitor.rs

@@ -178,8 +178,12 @@ fn walk_if_expr_body<V: ASTVisitor>(v: &mut V, body: &IfExpressionBody) {
                     Condition::Expression(ref expr) => {
                         walk_expression(v, expr);
                     }
-                    _ => (),
+                    Condition::Else => (),
                 }
+                if let Some(ref guard) = arm.guard {
+                    walk_expression(v, &guard);
+                }
+                walk_block(v, &arm.body);
             }
         }
     }