Add a test for Rust issue #56639

Technically we don't need this right now, but it's good to have
just in case we decide go to back to using custom sections some
time in the future.

standalone-tests/Cargo.toml

@@ -9,3 +9,5 @@ stdweb-derive = { path = "../stdweb-derive" }
 
 serde = "1"
 serde_derive = "1"
+
+dependency = { path = "dependency" }

standalone-tests/dependency/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "dependency"
+version = "0.1.0"
+authors = ["Jan Bujak <[email protected]>"]
+
+[dependencies]
+stdweb = { path = "../.." }

standalone-tests/dependency/src/lib.rs

@@ -0,0 +1,14 @@
+#[macro_use]
+extern crate stdweb;
+
+pub fn call() {
+    submodule::call();
+}
+
+mod submodule {
+    pub(crate) fn call() {
+        js!( @(no_return)
+            Module.test_value = 123;
+        );
+    }
+}

standalone-tests/src/main.rs

@@ -17,6 +17,8 @@ extern crate serde;
 #[macro_use]
 extern crate serde_derive;
 
+extern crate dependency;
+
 use std::panic;
 
 #[macro_use]

standalone-tests/src/tests/mod.rs

@@ -1,6 +1,7 @@
 #[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
 mod test_js_export;
 mod test_derive_reference_type;
+mod test_misc;
 
 pub mod exports {
     #[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
@@ -11,4 +12,5 @@ pub fn run_all_tests() {
     #[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
     test_js_export::run();
     test_derive_reference_type::run();
+    test_misc::run();
 }

standalone-tests/src/tests/test_misc.rs

@@ -0,0 +1,12 @@
+use utils::*;
+use dependency;
+
+pub fn run() {
+    // See https://github.com/rust-lang/rust/issues/56639 for more details.
+    test( "indirectly_call_js_snippet_from_a_submodule_in_another_crate", || {
+        dependency::call();
+        js! {
+            assert.strictEqual( Module.test_value, 123 );
+        }
+    });
+}