fix(core): write RenderResult::eprintln to stderr

Fix the method to use `eprintln!` instead of `println!` when
`immediate_output` is enabled, ensuring error output goes to stderr.

1 files changed, 1 insertions, 1 deletions

diff --git a/mingling_core/src/renderer/render_result.rs b/mingling_core/src/renderer/render_result.rs
index fc3f2b1..3e63a00 100644
--- a/mingling_core/src/renderer/render_result.rs
+++ b/mingling_core/src/renderer/render_result.rs
@@ -350,7 +350,7 @@ impl RenderResult {
     pub fn eprintln(&mut self, text: impl Into<String>) {
         let text = text.into();
         if self.immediate_output {
-            println!("{}", text)
+            eprintln!("{}", text)
         }
         self.append_line_to_buffer(text, Stderr);
     }