Steps to reproduce:
1. Open the attached project
2. Build to iOS
3. Observe the cube in iOS device

Expected result: cube is black&white

Actual result: cube is pink, Debug log is flooded with these messages:
Compilation failed:

program_source:97:29: error: cannot use as_type to cast from 'half' to 'int', types of different size
u_xlati9 = u_xlatb2.y ? as_type<int>(u_xlat16_2.x) : int(0);
^~~~~~~~~~~~~~~~~~~~~~~~~~
program_source:115:53: error: cannot use as_type to cast from 'half' to 'unsigned int', types of different size
u_xlati22 = int(uint(u_xlatb22) * 0xffffffffu | as_type<uint>(u_xlat16_2.y));
^~~~~~~~~~~~~~~~~~~~~~~~~~~
program_source:119:34: error: cannot use as_type to cast from 'half' to 'int', types of different size
u_xlati22 = u_xlatb4.y ? as_type<int>(u_xlat16_2.x) : int(0);
^~~~~~~~~~~~~~~~~~~~~~~~~~

Reproduced on: 5.5.4p2, 5.6.3f1, 2017.1.0p5, 2017.2.0b6 (Metal)
Could not reproduce on: 2017.3.0a4, on this version the shader has a compile error in the editor:
Too many texture interpolators would be used for ForwardBase pass (11 out of max 10)
Thus the cube is purely white on both Metal and OpenGLES2
______
FIXED IN 2017.3

The line "#pragma target 3.0" should be commented out or removed.