Normalize passes keep spans and clean warnings

src/runner/modes/common_util/diag.rs

@@ -101,14 +101,12 @@ fn print_source_snippet(filename: &str, src: &str, line: usize, col: Option<usiz
         if line <= lines.len() {
             let text = lines[line - 1];
             let mut underline = String::new();
-            let mut idx = 0usize;
             for (i, ch) in text.chars().enumerate() {
                 if i + 1 >= col {
                     break;
                 }
                 // Preserve tabs visually; spaces elsewhere
                 underline.push(if ch == '\t' { '\t' } else { ' ' });
-                idx = i;
             }
             let pad = "        "; // align under "  LNNNNN |"
             eprintln!("          {}{}^", pad, underline);

src/runner/modes/common_util/resolve/prelude_manager.rs

@@ -178,6 +178,7 @@ impl<'a> PreludeManagerBox<'a> {
             });
             current_line += main_lines;
         }
+        let _ = current_line;
 
         if trace {
             crate::runner::trace::log(format!(

src/runner/modes/common_util/resolve/strip.rs

@@ -999,6 +999,7 @@ pub fn merge_prelude_text(
         });
         current_line += main_lines;
     }
+    let _ = current_line;
 
     if trace {
         crate::runner::trace::log(format!(