Reproduction Steps:
1. Create new project on Unity 5.3.4f1
2. Create new Shader
3. Copy Paste code from edit to the Shader
4. Notice that it compiles
5. Close project
6. Open this project with Unity 5.4.0b21
7. Notice that it does not compile anymore

Expected: All references to "_Object2World" should change to "unity_ObjectToWorld"
Actual: Not all references are changed. It is not renamed if "_Object2World" is followed by a period. (_Object2World.???)