To reproduce:

1. Download and open attached "VertexIDTest.zip" project.
2. Select the "VertexIDTest" shader from the project view.
3. Press the "Compile and show code" button in the inspector.

Expected result: Shader compiles without any errors.
Actual result: Shader fails to compile. Errors appear in the console.

Reproduced with: 2017.2.0b3, 2017.1.0f3, 5.6.2p4, 5.5.4p1.

Notes: Shader fails to compile when Graphics API is set to either OpenGLES3, OpenGLES2, OpenGLCore, Vulkan. Error appears when the following conditions are met(line 31 in VertexIDTest shader):
- Testing equality between the vertex ID (SV_VertexID) and constant values in a vertex shader.
- There are more than two equality tests, and the test results are going to be stored into the same float vector.

Verified with: 2017.3.0b1