| A literal was used in a built-in attribute that doesn't support literals. | |
| Erroneous code example: | |
| ```ignore (compile_fail not working here; see Issue #43707) | |
| #[inline("always")] // error: unsupported literal | |
| pub fn something() {} | |
| ``` | |
| Literals in attributes are new and largely unsupported in built-in attributes. | |
| Work to support literals where appropriate is ongoing. Try using an unquoted | |
| name instead: | |
| ``` | |
| #[inline(always)] | |
| pub fn something() {} | |
| ``` |