<===> input.scss
$map: (
  'red': 'bar',
  #{re}#{'d'}: 'baz',
);

.foo {
  content: inspect($map);
}
<===> error
Error: Duplicate key "red" in map ("red": "bar", #{re}#{"d"}: "baz").
        on line 1 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: Duplicate key.
  ,
2 |   'red': 'bar',
  |   ===== first key
3 |   #{re}#{'d'}: 'baz',
  |   ^^^^^^^^^^^ second key
  '
  input.scss 3:3  root stylesheet