Use Display for Builder::generate errors

Author: pvdrz

bindgen-cli/main.rs

@@ -40,8 +40,13 @@ pub fn main() {
                 eprintln!("{info}");
             }));
 
-            let bindings =
-                builder.generate().expect("Unable to generate bindings");
+            let bindings = match builder.generate() {
+                Ok(bindings) => bindings,
+                Err(err) => {
+                    eprintln!("Unable to generate bindings: {err}");
+                    std::process::exit(1)
+                }
+            };
 
             let _ = std::panic::take_hook();