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package wasi:io@0.2.1;
@since(version = 0.2.0)
interface error {
/// A resource which represents some error information.
///
/// The only method provided by this resource is `to-debug-string`,
/// which provides some human-readable information about the error.
///
/// In the `wasi:io` package, this resource is returned through the
/// `wasi:io/streams/stream-error` type.
///
/// To provide more specific error information, other interfaces may
/// offer functions to "downcast" this error into more specific types. For example,
/// errors returned from streams derived from filesystem types can be described using
/// the filesystem's own error-code type. This is done using the function
/// `wasi:filesystem/types/filesystem-error-code`, which takes a `borrow<error>`
/// parameter and returns an `option<wasi:filesystem/types/error-code>`.
///
/// The set of functions which can "downcast" an `error` into a more
/// concrete type is open.
@since(version = 0.2.0)
resource error {
/// Returns a string that is suitable to assist humans in debugging
/// this error.
///
/// WARNING: The returned string should not be consumed mechanically!
/// It may change across platforms, hosts, or other implementation
/// details. Parsing this string is a major platform-compatibility
/// hazard.
@since(version = 0.2.0)
to-debug-string: func() -> string;
}
}
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