Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide-diagnostics/src/handlers/cannot_implicitly_deref_trait_object.rs')
| -rw-r--r-- | crates/ide-diagnostics/src/handlers/cannot_implicitly_deref_trait_object.rs | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/crates/ide-diagnostics/src/handlers/cannot_implicitly_deref_trait_object.rs b/crates/ide-diagnostics/src/handlers/cannot_implicitly_deref_trait_object.rs new file mode 100644 index 0000000000..eca14144dd --- /dev/null +++ b/crates/ide-diagnostics/src/handlers/cannot_implicitly_deref_trait_object.rs @@ -0,0 +1,53 @@ +use hir::HirDisplay; + +use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext}; + +// Diagnostic: cannot-implicitly-deref-trait-object +// +// This diagnostic is triggered when a pointer to a trait object is implicitly +// dereferenced by a pattern. +pub(crate) fn cannot_implicitly_deref_trait_object( + ctx: &DiagnosticsContext<'_, '_>, + d: &hir::CannotImplicitlyDerefTraitObject<'_>, +) -> Diagnostic { + Diagnostic::new_with_syntax_node_ptr( + ctx, + DiagnosticCode::RustcHardError("E0033"), + format!( + "type `{}` cannot be dereferenced", + d.found.display(ctx.sema.db, ctx.display_target) + ), + d.pat.map(Into::into), + ) + .stable() +} + +#[cfg(test)] +mod tests { + use crate::tests::check_diagnostics; + + #[test] + fn trait_object_pattern_deref() { + check_diagnostics( + r#" +trait Trait {} + +fn f(x: &dyn Trait) { + let &ref _y = x; + //^^^^^^^ error: type `&(dyn Trait + 'static)` cannot be dereferenced +} +"#, + ); + } + + #[test] + fn allows_sized_ref_pattern_deref() { + check_diagnostics( + r#" +fn f(x: &i32) { + let &ref _y = x; +} +"#, + ); + } +} |