From 32b62b43589ac0fcd23687c634dd214a1acb7bdb Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Tue, 2 Oct 2018 23:55:07 -0700
Subject: [PATCH] Fix exporting structs with `BorrowMut` in scope

Apparently the codegen wasn't precise enough such that a trait import
could cause method resolution to go awry!

Closes #919
---
 crates/backend/src/codegen.rs | 2 +-
 tests/wasm/classes.rs         | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/backend/src/codegen.rs b/crates/backend/src/codegen.rs
index 8057ec33..644210de 100644
--- a/crates/backend/src/codegen.rs
+++ b/crates/backend/src/codegen.rs
@@ -165,7 +165,7 @@ impl ToTokens for ast::Struct {
                     let ptr = js as *mut WasmRefCell<#name>;
                     assert_not_null(ptr);
                     let js = Box::from_raw(ptr);
-                    js.borrow_mut(); // make sure no one's borrowing
+                    (*js).borrow_mut(); // make sure no one's borrowing
                     js.into_inner()
                 }
             }
diff --git a/tests/wasm/classes.rs b/tests/wasm/classes.rs
index b61fb30a..c0b562f7 100644
--- a/tests/wasm/classes.rs
+++ b/tests/wasm/classes.rs
@@ -1,3 +1,6 @@
+#[allow(unused_imports)] // test for #919
+use std::borrow::BorrowMut;
+
 use wasm_bindgen::prelude::*;
 use wasm_bindgen_test::*;