pub fn exception(out: &mut CodeValue, source: &str, message: &str)Expand description
Build Exception { source, message, innerException } into out — how a
module reports that it could not do the work.
This is the only way a module should fail. A module may never end the
application (docs/todo/errors-as-particles.md): the program receives
this as an ordinary value through get, and may test it with
is Exception, read message, or ignore it entirely.
source names the module, which a returned value cannot otherwise be
asked — the caller knows what it emitted to, but an Exception stored,
passed on, or wrapped as another’s innerException has lost that.
innerException is null here; use exception_wrapping to carry the
failure underneath this one.