Reproduction Steps:
1. Import attached project.
2. Open "gMain" scene.
3. In Build Settings, switch platform to WebGL.
4. In Player Settings, activate "WebAssembly (Experimental)".
5. Build project.
6. Open build in Firefox.

Expected result: WebGL runs without error.
Actual result: WebGL throws out error:
An error occured running the Unity content on this page. See your browser JavaScript console for more info. The error was:
TypeError: asm.setThrew is not a function.

Note: If WebAssembly is disabled, WebGL runs without error.

Reproducible with: 5.6.0f3, 2017.1.0b1