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Diffstat (limited to 'crates/ide-diagnostics/src/handlers/mutable_ref.rs')
| -rw-r--r-- | crates/ide-diagnostics/src/handlers/mutable_ref.rs | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/crates/ide-diagnostics/src/handlers/mutable_ref.rs b/crates/ide-diagnostics/src/handlers/mutable_ref.rs new file mode 100644 index 0000000000..9423f2a9aa --- /dev/null +++ b/crates/ide-diagnostics/src/handlers/mutable_ref.rs @@ -0,0 +1,60 @@ +use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext}; + +// Diagnostic: mutable-ref +// +// This diagnostic is triggered when binding is taken that is both mutable and by-reference. +pub(crate) fn mutable_ref_binding( + ctx: &DiagnosticsContext<'_, '_>, + d: &hir::MutableRefBinding, +) -> Diagnostic { + Diagnostic::new_with_syntax_node_ptr( + ctx, + DiagnosticCode::RustcHardError("E0658"), + "`mut` bindings cannot also be `ref` by default in 2024 edition", + d.pat.map(Into::into), + ) + .stable() +} + +#[cfg(test)] +mod tests { + use crate::tests::check_diagnostics; + + #[test] + fn mutable_ref_binding_missing_feature() { + check_diagnostics( + r#" +//- minicore: option +//- /main.rs +#![feature(ref_pat_eat_one_layer_2024)] +fn main() { + let opt_ref = &Some(42); + + if let Some(mut x) = opt_ref { + //^^^^^ error: `mut` bindings cannot also be `ref` by default in 2024 edition + x = &5; + } +} +"#, + ); + } + + #[test] + fn mutable_ref_binding_with_feature() { + check_diagnostics( + r#" +//- minicore: option +//- /main.rs +#![feature(ref_pat_eat_one_layer_2024)] +#![feature(mut_ref)] +fn main() { + let opt_ref = &Some(42); + + if let Some(mut x) = opt_ref { + x = &5; + } +} +"#, + ); + } +} |