Struct ThrownException 

pub struct ThrownException;

Available on crate feature gc only.

An error type that represents that a pending WebAssembly exception is set on the associated Store.

When used as an error type and returned from a Wasm-to-host call, or host-to-Wasm call, it indicates that the caller should either continue propagating the error upward, or take and handle the exception using [crate::Store::take_exception] (or a helper such as [crate::Store::catch].

Wasmtime uses an error type without payload, and stores the exception itself on the store, to maintain proper GC rooting; otherwise, it is difficult to get exception propagation up the stack right in the presence of nested handle scopes. A pending exception on the store is safely rooted as long as it is stored there.

Trait Implementations

impl Debug for ThrownException

Available on crate feature runtime only.

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ThrownException

Available on crate feature runtime only.

Error requires Display.

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for ThrownException

Available on crate feature runtime only.

We need to implement Error for ThrownException so it can be boxed up into an anyhow::Error.

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.