work

src/io/mod.rs

@@ -90,6 +90,22 @@ impl Span {
                 &text[self.start..=self.end],
                 &text[(self.end + 1)..range.end]
             )?;
+        } else if let [(sline, srange), (eline, erange)] = &spans[..] {
+            writeln!(
+                w,
+                "   {sline:3} | {}{underline}{underline_color}{}{end}",
+                &text[srange.start..self.start],
+                &text[self.start..=srange.end - 1],
+            )?;
+            if *eline != *sline + 1 {
+                writeln!(w, "            ...")?;
+            }
+            writeln!(
+                w,
+                "   {eline:3} | {underline}{underline_color}{}{end}{}",
+                &text[erange.start..=self.end],
+                &text[(self.end + 1)..=erange.end - 1],
+            )?;
         }
         Ok(())
     }