| use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext}; |
| |
| // Diagnostic: invalid-derive-target |
| // |
| // This diagnostic is shown when the derive attribute is used on an item other than a `struct`, |
| // `enum` or `union`. |
| pub(crate) fn invalid_derive_target( |
| ctx: &DiagnosticsContext<'_>, |
| d: &hir::InvalidDeriveTarget, |
| ) -> Diagnostic { |
| let display_range = ctx.sema.diagnostics_display_range(d.node); |
| |
| Diagnostic::new( |
| DiagnosticCode::RustcHardError("E0774"), |
| "`derive` may only be applied to `struct`s, `enum`s and `union`s", |
| display_range, |
| ) |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use crate::tests::check_diagnostics; |
| |
| #[test] |
| fn fails_on_function() { |
| check_diagnostics( |
| r#" |
| //- minicore:derive |
| mod __ { |
| #[derive()] |
| //^^^^^^^^^^^ error: `derive` may only be applied to `struct`s, `enum`s and `union`s |
| fn main() {} |
| } |
| "#, |
| ); |
| } |
| } |
