Reproduction steps:

1. Open "InternalsVisibleBug.zip" project
2. Enter Play mode
3. See that a "MethodAccessException" error was thrown
4. Switch the Scripting Runtime to .NET 3.5
5. Enter Play mode
6. See that a message "created" was outputted to the console

Fixed in: 2018.1.0b1

Expected Result: The message "created" should be outputted with the .NET 4.6 Scripting Runtime instead of the AccesException error
Actual Result: With Scripting Runtime .NET 4.6 a "MethodAccessException" error is thrown

Reproduced with: 2017.3.0a7, 2017.2.0b11, 2017.1.1p1
Did not reproduce on: 5.6.3p3 (No .NET 4.6 Scripting Runtime)