bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide-diagnostics/src/handlers/await_outside_of_async.rs')
-rw-r--r--crates/ide-diagnostics/src/handlers/await_outside_of_async.rs101
1 files changed, 101 insertions, 0 deletions
diff --git a/crates/ide-diagnostics/src/handlers/await_outside_of_async.rs b/crates/ide-diagnostics/src/handlers/await_outside_of_async.rs
new file mode 100644
index 0000000000..92b6e748ca
--- /dev/null
+++ b/crates/ide-diagnostics/src/handlers/await_outside_of_async.rs
@@ -0,0 +1,101 @@
+use crate::{adjusted_display_range, Diagnostic, DiagnosticsContext};
+
+// Diagnostic: await-outside-of-async
+//
+// This diagnostic is triggered if the `await` keyword is used outside of an async function or block
+pub(crate) fn await_outside_of_async(
+ ctx: &DiagnosticsContext<'_>,
+ d: &hir::AwaitOutsideOfAsync,
+) -> Diagnostic {
+ let display_range =
+ adjusted_display_range(ctx, d.node, &|node| Some(node.await_token()?.text_range()));
+ Diagnostic::new(
+ crate::DiagnosticCode::RustcHardError("E0728"),
+ format!("`await` is used inside {}, which is not an `async` context", d.location),
+ display_range,
+ )
+}
+
+#[cfg(test)]
+mod tests {
+ use crate::tests::check_diagnostics;
+
+ #[test]
+ fn await_inside_non_async_fn() {
+ check_diagnostics(
+ r#"
+async fn foo() {}
+
+fn bar() {
+ foo().await;
+ //^^^^^ error: `await` is used inside non-async function, which is not an `async` context
+}
+"#,
+ );
+ }
+
+ #[test]
+ fn await_inside_async_fn() {
+ check_diagnostics(
+ r#"
+async fn foo() {}
+
+async fn bar() {
+ foo().await;
+}
+"#,
+ );
+ }
+
+ #[test]
+ fn await_inside_closure() {
+ check_diagnostics(
+ r#"
+async fn foo() {}
+
+async fn bar() {
+ let _a = || { foo().await };
+ //^^^^^ error: `await` is used inside non-async closure, which is not an `async` context
+}
+"#,
+ );
+ }
+
+ #[test]
+ fn await_inside_async_block() {
+ check_diagnostics(
+ r#"
+async fn foo() {}
+
+fn bar() {
+ let _a = async { foo().await };
+}
+"#,
+ );
+ }
+
+ #[test]
+ fn await_in_complex_context() {
+ check_diagnostics(
+ r#"
+async fn foo() {}
+
+fn bar() {
+ async fn baz() {
+ let a = foo().await;
+ }
+
+ let x = || {
+ let y = async {
+ baz().await;
+ let z = || {
+ baz().await;
+ //^^^^^ error: `await` is used inside non-async closure, which is not an `async` context
+ };
+ };
+ };
+}
+"#,
+ );
+ }
+}