Combine consecutive 'a *= 2.0; a *= foo' #1
Description
...if rhs doesn't use 'a'.
See https://www.shadertoy.com/view/MdXXW2 sound, https://www.shadertoy.com/view/NsSXWd
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...if rhs doesn't use 'a'.
See https://www.shadertoy.com/view/MdXXW2 sound, https://www.shadertoy.com/view/NsSXWd