Reproduction steps:
1. Open the attached "stripped" project.
2. Build and run the "Main" scene for iOS.

Actual behavior:
* 5.3.6p7
- Apple LLVM 8.0 Error
- no such file or directory
- no input files

* 5.4.1p4
- Unknown type name 'class'
- Expected ';' after top level declarator

* 5.5.0b7(Xcode project doesn't build)
- error CS1704: An assembly with the same name has already been imported. Consider removing one of the references or sign the assembly

Reproduced with:
- iPad Air 2 9.3.2

Not reproducible with:
- 5.3.6f1