HLSL to Metal translator fails properly translate CameraMotionBlur shader

1. What happened

Translated shader causes runtime compilation errors when running on Metal.
It's failing with error:
program_source:51:13: error: assigning to 'half4' (aka 'vector_half4') from incompatible type 'vec<float, 4>' (vector of 4 'float' values)
tmpvar_16 = _CameraDepthTexture.sample(_mtlsmp__CameraDepthTexture, (float2)(_mtl_i.xlv_TEXCOORD0), level(0.0));

2. How we can reproduce it using the example you attached
Run attached project on Metal capable iOS device. You will see pink quad on screen and shader compilation errors in Xcode debugger console.