error: Handlers cannot take more than 16 arguments. Use `(a, b): (ExtractorA, ExtractorA)` to further nest extractors
  --> tests/debug_handler/fail/too_many_extractors.rs:6:5
   |
6  | /     _e1: Uri,
7  | |     _e2: Uri,
8  | |     _e3: Uri,
9  | |     _e4: Uri,
...  |
21 | |     _e16: Uri,
22 | |     _e17: Uri,
   | |______________^