I have been experiencing crashes running the latest beta of POV-Ray v3.8 (Win64)
when trying to call a spline.  The narrowed it down to a few lines of code that
causes the crash:

#macro make_spline()
    #local _s   = spline {
        quadratic_spline
        0, <0, 0, 0>,
        1, <0, 0, 1>,
        2, <1, 0, 2>,
        3, <2, 1, 3>
    }
    _s
#end

#local myspline = spline { make_spline() }

#debug concat("_pt=<", vstr(3, myspline(0), ",", 0, 3), ">\n")

The contents of the spline don't seem to matter nor does the type of spline.
The result is a memory access violation.

When I run the same code on v3.7 it works fine.

Declaring the spline outside of a macro does not cause the crash:

#local myspline   = spline {
    natural_spline
    0, <0, 0, 0>,
    1, <0, 0, 1>,
    2, <1, 0, 2>,
    3, <2, 1, 3>
}

#debug concat("_pt=<", vstr(3, myspline(0), ",", 0, 3), ">\n")

-- Chris R.

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