fix(rspack_loader_runner): char_boundary panic when debug content (#6412

)

crates/rspack_loader_runner/src/content.rs

@@ -87,7 +87,10 @@ impl Debug for Content {
     };
 
     content
-      .field(ty, &s[0..usize::min(s.len(), 20)].to_owned())
+      .field(
+        ty,
+        &s[0..usize::min(s.len(), s.ceil_char_boundary(20))].to_owned(),
+      )
       .finish()
   }
 }

crates/rspack_loader_runner/src/lib.rs

@@ -1,4 +1,5 @@
 #![feature(let_chains)]
+#![feature(round_char_boundary)]
 
 mod content;
 mod loader;