1 files changed, 6 insertions, 2 deletions
diff --git a/examples/nested_coord.rs b/examples/nested_coord.rs
index 96f2e34..b700101 100644
--- a/examples/nested_coord.rs
+++ b/examples/nested_coord.rs
@@ -1,7 +1,7 @@
 use plotters::prelude::*;
+const OUT_FILE_NAME: &'static str = "plotters-doc-data/nested_coord.png";
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let root =
-        BitMapBackend::new("plotters-doc-data/nested_coord.png", (640, 480)).into_drawing_area();
+    let root = BitMapBackend::new(OUT_FILE_NAME, (640, 480)).into_drawing_area();
 
     root.fill(&WHITE)?;
 
@@ -35,6 +35,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         &RED,
     ))?;
 
+    // To avoid the IO failure being ignored silently, we manually call the present function
+    root.present().expect("Unable to write result to file, please make sure 'plotters-doc-data' dir exists under current dir");
+    println!("Result has been saved to {}", OUT_FILE_NAME);
+
     Ok(())
 }
 #[test]