error: failed to parse template source
 --> <source attribute>:3:4
       "// Help, I forgot how to write comments!\n    {%- when true %}\n        good\n    {"...
  --> tests/ui/match_with_extra.rs:6:14
   |
6  |       source = r#"
   |  ______________^
7  | | {%- match good -%}
8  | |     // Help, I forgot how to write comments!
9  | |     {%- when true %}
...  |
12 | |         bad
13 | | {%- endmatch -%}"#
   | |__________________^