ide_diagnostics/handlers/
await_outside_of_async.rs

1use crate::{Diagnostic, DiagnosticsContext, adjusted_display_range};
2
3// Diagnostic: await-outside-of-async
4//
5// This diagnostic is triggered if the `await` keyword is used outside of an async function or block
6pub(crate) fn await_outside_of_async(
7    ctx: &DiagnosticsContext<'_, '_>,
8    d: &hir::AwaitOutsideOfAsync,
9) -> Diagnostic {
10    let display_range =
11        adjusted_display_range(ctx, d.node, &|node| Some(node.await_token()?.text_range()));
12    Diagnostic::new(
13        crate::DiagnosticCode::RustcHardError("E0728"),
14        format!("`await` is used inside {}, which is not an `async` context", d.location),
15        display_range,
16    )
17    .stable()
18}
19
20#[cfg(test)]
21mod tests {
22    use crate::tests::check_diagnostics;
23
24    #[test]
25    fn await_inside_non_async_fn() {
26        check_diagnostics(
27            r#"
28async fn foo() {}
29
30fn bar() {
31    foo().await;
32        //^^^^^ error: `await` is used inside non-async function, which is not an `async` context
33}
34"#,
35        );
36    }
37
38    #[test]
39    fn await_inside_async_fn() {
40        check_diagnostics(
41            r#"
42async fn foo() {}
43
44async fn bar() {
45    foo().await;
46}
47"#,
48        );
49    }
50
51    #[test]
52    fn await_inside_closure() {
53        check_diagnostics(
54            r#"
55//- minicore: future
56async fn foo() {}
57
58async fn bar() {
59    let _a = || { foo().await };
60                      //^^^^^ error: `await` is used inside non-async closure, which is not an `async` context
61}
62"#,
63        );
64    }
65
66    #[test]
67    fn await_inside_async_block() {
68        check_diagnostics(
69            r#"
70//- minicore: future
71async fn foo() {}
72
73fn bar() {
74    let _a = async { foo().await };
75}
76"#,
77        );
78    }
79
80    #[test]
81    fn await_in_complex_context() {
82        check_diagnostics(
83            r#"
84//- minicore: future
85async fn foo() {}
86
87fn bar() {
88    async fn baz() {
89        let a = foo().await;
90    }
91
92    let x = || {
93        let y = async {
94            baz().await;
95            let z = || {
96                baz().await;
97                    //^^^^^ error: `await` is used inside non-async closure, which is not an `async` context
98            };
99        };
100    };
101}
102"#,
103        );
104    }
105}
ide_diagnostics/handlers/await_outside_of_async.rs

ide_diagnostics/handlers/
await_outside_of_async.rs
