It passes by the line that declares linear_spline because of the #if
statement.
#include "colors.inc"

#declare Test = 0;//0 is the same as false


#if (Test)
        //because Test is 0, all this stuff is ignored and the #else
block is used instead.
        #declare screen_text = texture {pigment {White}}
        //You can't declare a variable as linear_spline! But this block
is ignored, so it doesn't matter.
        #declare Spline = linear_spline;

#else

        #declare screen_text = texture {pigment {White} finish {diffuse
0.3
reflection 0.3 specular 0.7}
        //You can't declare a variable as cubic_spline!
        #declare Spline = cubic_spline;

#end

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