grf {
    grfid: "NML\33";
    name: string(STR_REGRESSION_NAME);
    desc: string(STR_REGRESSION_DESC);
    version: 0;
    min_compatible_version: 0;
}

/* some computation that requires registers for intermediate values */
switch(FEAT_INDUSTRIES, SELF, callee, (water_distance+layout_num)*(founder_type+founder_colour1)) {
    return;
}

switch(FEAT_INDUSTRIES, SELF, caller, (founder_colour2+build_date)*(random_bits+callee)) {
    return;
}

item(FEAT_INDUSTRIES, coal_mine) {
    property {
        substitute: INDUSTRYTYPE_COAL_MINE;
        override: INDUSTRYTYPE_COAL_MINE;
    }
    graphics {
        build_prod_change: return caller;
    }
}