Add tests for internal imports now working

These compiler bugs have now been fixed on nightly, so we just need to
wait for the bug fixes to ride the trains to be available to everyone!

Closes #201

Author: alexcrichton

tests/wasm/imports.js

@@ -101,3 +101,6 @@ exports.assert_dead_import_not_generated = function() {
   const bindings = fs.readFileSync(filename);
   assert.ok(!bindings.includes("unused_import"));
 };
+
+exports.import_inside_function_works = function() {};
+exports.import_inside_private_module = function() {};

tests/wasm/imports.rs

@@ -175,3 +175,31 @@ fn rename_static_with_string() {
 fn dead_imports_not_generated() {
     assert_dead_import_not_generated();
 }
+
+#[wasm_bindgen_test]
+#[cfg(feature = "nightly")]
+fn import_inside_function_works() {
+    #[wasm_bindgen(module = "tests/wasm/imports.js")]
+    extern {
+        fn import_inside_function_works();
+    }
+    import_inside_function_works();
+}
+
+#[wasm_bindgen_test]
+#[cfg(feature = "nightly")]
+fn private_module_imports_work() {
+    private::foo();
+}
+
+mod private {
+    use wasm_bindgen::prelude::*;
+
+    pub fn foo() {
+        #[wasm_bindgen(module = "tests/wasm/imports.js")]
+        extern {
+            fn import_inside_private_module();
+        }
+        import_inside_private_module();
+    }
+}