demo app, long string print

demo/build.rs

@@ -0,0 +1,18 @@
+use std::{
+    env,
+    error::Error,
+    fs::File,
+    io::{BufWriter, Write},
+    path::Path,
+};
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let out_dir = env::var("OUT_DIR")?;
+    let dest_path = Path::new(&out_dir).join("long_string.txt");
+    let mut f = BufWriter::new(File::create(&dest_path)?);
+
+    let long_string = "abc".repeat(100);
+    write!(f, "{}", long_string)?;
+
+    Ok(())
+}