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Diffstat (limited to 'crates/ide-diagnostics/src/handlers/unreachable_label.rs')
| -rw-r--r-- | crates/ide-diagnostics/src/handlers/unreachable_label.rs | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/crates/ide-diagnostics/src/handlers/unreachable_label.rs b/crates/ide-diagnostics/src/handlers/unreachable_label.rs new file mode 100644 index 0000000000..9fedadeae0 --- /dev/null +++ b/crates/ide-diagnostics/src/handlers/unreachable_label.rs @@ -0,0 +1,91 @@ +use crate::{Diagnostic, DiagnosticsContext}; + +// Diagnostic: unreachable-label +pub(crate) fn unreachable_label( + ctx: &DiagnosticsContext<'_>, + d: &hir::UnreachableLabel, +) -> Diagnostic { + let name = &d.name; + Diagnostic::new( + "unreachable-label", + format!("use of unreachable label `{}`", name.display(ctx.sema.db)), + ctx.sema.diagnostics_display_range(d.node.clone().map(|it| it.into())).range, + ) +} + +#[cfg(test)] +mod tests { + use crate::tests::check_diagnostics; + + #[test] + fn async_blocks_are_borders() { + check_diagnostics( + r#" +fn foo() { + 'a: loop { + async { + break 'a; + //^^^^^^^^ error: break outside of loop + // ^^ error: use of unreachable label `'a` + continue 'a; + //^^^^^^^^^^^ error: continue outside of loop + // ^^ error: use of unreachable label `'a` + }; + } +} +"#, + ); + } + + #[test] + fn closures_are_borders() { + check_diagnostics( + r#" +fn foo() { + 'a: loop { + || { + break 'a; + //^^^^^^^^ error: break outside of loop + // ^^ error: use of unreachable label `'a` + continue 'a; + //^^^^^^^^^^^ error: continue outside of loop + // ^^ error: use of unreachable label `'a` + }; + } +} +"#, + ); + } + + #[test] + fn blocks_pass_through() { + check_diagnostics( + r#" +fn foo() { + 'a: loop { + { + break 'a; + continue 'a; + } + } +} +"#, + ); + } + + #[test] + fn try_blocks_pass_through() { + check_diagnostics( + r#" +fn foo() { + 'a: loop { + try { + break 'a; + continue 'a; + }; + } +} +"#, + ); + } +} |