>= 0.0.40 does not work - Missing path separators (Windows 10)

[tectin0]

use gnuplot::{Color, Figure, PlotOption::Caption};

fn main() {
    let x = [0u32, 1, 2];
    let y = [3u32, 4, 5];

    let mut fg = Figure::new();

    fg.axes2d()
        .lines(&x, &y, &[Caption("A line"), Color("black")]);

    fg.show().unwrap();
}

On version 0.0.40 and above the path separators get lost at some point and result in the error message:

line 0: warning: Cannot find or open file "C:Users<user>AppDataLocalTemp.tmpDx2PP1"
line 0: No data in plot

OS: Windows 10
Gnuplot versions tested: 5.20, 5.28, 5.4.8

[SiegeLord]

Thanks for reporting!