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color-r colorprocedure
colour-r colorprocedure
set! (color-r color) valsetter
set! (colour-r color) valsetter
color-r-set! color valsetter
colour-r-set! color valsetter

Get or set the sdl2:color's "r" (red) field, as an integer in the range 0 to 255 (inclusive).