Steps to reproduce:

1. Download and import attached project. (CompileError.zip)
2. Open scene: main.
3. Press play.
4. No compilation errors, game just plays fine.
5. Try to build the project.

Expected result: Project builds without errors as in player.
Actual result: Cannot build project and error come out:

Assets/TextureTilling.cs(50,22): error CS1525: Unexpected symbol `return'
Error building Player because scripts had compiler errors

Reproduced on: 5.4.0b19, 5.3.4f1, 5.2.4f1