if (conjure_flame(powc) == -1)

        if (!conjure_flame(powc))

int conjure_flame(int pow);

bool conjure_flame(int pow);

int conjure_flame(int pow)

// return whether the spell was actually cast
bool conjure_flame(int pow)

            return (-1);

            return false;

        if (grid_is_solid(grd[ spelld.tx ][ spelld.ty ])
            || mgrd[ spelld.tx ][ spelld.ty ] != NON_MONSTER 
            || env.cgrid[ spelld.tx ][ spelld.ty ] != EMPTY_CLOUD)

        const int cloud = env.cgrid[spelld.tx][spelld.ty];
        if (grid_is_solid(grd[ spelld.tx ][ spelld.ty ]) ||
            mgrd[ spelld.tx ][ spelld.ty ] != NON_MONSTER ||
            (cloud != EMPTY_CLOUD && env.cloud[cloud].type != CLOUD_FIRE))

        }
        else if ( cloud != EMPTY_CLOUD )
        {
            // reinforce the cloud - but not too much
            mpr( "The fire roars with new energy!" );
            const int extra_dur = 2 + std::min(random2(pow) / 2, 20);
            env.cloud[cloud].decay += extra_dur * 5;
            env.cloud[cloud].whose = KC_YOU;
            return true;

        break;    

        break;

    return (1);
}                               // end cast_conjure_flame()

    return true;
}