refactor(examples): migrate renderers to return RenderResult and add

std::io::Write import

Replace r_println!/r_print! macro usage across all example renderers
with
explicit RenderResult construction using std::io::Write, enabling more
flexible output handling and reducing reliance on macro-side effects.

1 files changed, 6 insertions, 2 deletions

diff --git a/examples/example-panic-unwind/src/main.rs b/examples/example-panic-unwind/src/main.rs
index ed032c5..a829158 100644
--- a/examples/example-panic-unwind/src/main.rs
+++ b/examples/example-panic-unwind/src/main.rs
@@ -16,6 +16,7 @@
 //! ```
 
 use mingling::{hook::ProgramHook, prelude::*};
+use std::io::Write;
 
 dispatcher!("panic", CMDPanic => EntryPanic);
 pack!(NotPanic = ());
@@ -51,9 +52,12 @@ fn handle_panic(prev: EntryPanic) -> Next {
 }
 
 /// Renders the message when no panic occurs.
+/// Renders the message when no panic occurs.
 #[renderer]
-fn render(_: NotPanic) {
-    r_println!("Program not panic");
+pub fn render(_: NotPanic) -> RenderResult {
+    let mut render_result = RenderResult::new();
+    writeln!(render_result, "Program not panic").ok();
+    render_result
 }
 
 gen_program!();