Shader with a struct named 'input' does not work on Android devices. The editor does not show any specific errors, however in the device log "illegal use of reserved word 'input' " can be seen.

Reproduced on:
Google Nexus 5 with Android 4.4.2

Reproduced with:
Unity Version 4.3.4f1 (e444f76e01cd)

Resolution:
This won't be changed because the shader compiling is not done in the Unity editor. Moreover shader compilers in different devices are different (even regarding reserved words handling).