From 6e8c3e88f86790cdb526e1fcad2765ba8b451eb9 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Tue, 4 Jun 2019 09:26:27 -0700
Subject: [PATCH] Directly import `__wrap` functions if possible

These can have similar optimizations as importing a value directly.
---
 crates/cli-support/src/js/rust2js.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/cli-support/src/js/rust2js.rs b/crates/cli-support/src/js/rust2js.rs
index ed655078..b2d39ada 100644
--- a/crates/cli-support/src/js/rust2js.rs
+++ b/crates/cli-support/src/js/rust2js.rs
@@ -907,6 +907,9 @@ impl<'a, 'b> Rust2Js<'a, 'b> {
                 assert!(!variadic);
                 assert_eq!(self.js_arguments.len(), 1);
                 self.cx.require_class_wrap(class);
+                if self.is_noop() {
+                    return Ok(format!("{}.__wrap", class));
+                }
                 format!("{}.__wrap({})", class, self.js_arguments[0])
             }