error[E0545]: `issue` must be a non-zero numeric string or "none"
  --> $DIR/unstable-attribute-allow-issue-0.rs:6:47
   |
LL | #[unstable(feature = "unstable_test_feature", issue = "0")]
   |                                               ^^^^^^^^---
   |                                                       |
   |                                                       `issue` must not be "0", use "none" instead

error[E0545]: `issue` must be a non-zero numeric string or "none"
  --> $DIR/unstable-attribute-allow-issue-0.rs:12:47
   |
LL | #[unstable(feature = "unstable_test_feature", issue = "something")]
   |                                               ^^^^^^^^-----------
   |                                                       |
   |                                                       invalid digit found in string

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0545`.