fix: Tokens only extend to the end of the line

src/types.rs

@@ -713,6 +713,13 @@ impl SourceMap {
         let (idx, raw) =
             greatest_lower_bound(&self.tokens, &(line, col), |t| (t.dst_line, t.dst_col))?;
 
+        // If the token has a lower minified line number,
+        // it actually belongs to the previous line. That means it should
+        // not match.
+        if raw.dst_line < line {
+            return None;
+        }
+
         let mut token = Token {
             raw,
             sm: self,

tests/test_index.rs

@@ -100,10 +100,11 @@ fn test_basic_indexed_sourcemap() {
         ism.lookup_token(0, 0).unwrap().to_tuple(),
         ("file1.js", 0, 0, None)
     );
-    assert_eq!(
-        ism.lookup_token(1, 0).unwrap().to_tuple(),
-        ("file1.js", 2, 12, Some("b"))
-    );
+
+    // Line 1, column 0 (zero-based) falls into the first section,
+    // but there are no mappings for line 1 there.
+    assert!(ism.lookup_token(1, 0).is_none());
+
     assert_eq!(
         ism.lookup_token(1, 1).unwrap().to_tuple(),
         ("file2.js", 0, 0, None)

tests/test_regular.rs

@@ -29,11 +29,8 @@ fn test_basic_sourcemap() {
         ("coolstuff.js", 2, 8, None)
     );
 
-    // Token can return prior lines.
-    assert_eq!(
-        sm.lookup_token(1000, 0).unwrap().to_tuple(),
-        ("coolstuff.js", 2, 8, None)
-    );
+    // There are no mappings for line 1000.
+    assert!(sm.lookup_token(1000, 0).is_none());
 }
 
 #[test]