The coroutine format method displays its source code, its
effective environment, whether it is running or finished, and a
label indicating its last known state. The summary method
returns the same information in a list.
summary(obj) returns a list with information on a coroutine's state, including:
code: the expression used to create the coroutine;
state: the current state (see below);
node: is a character string that
identifies a location in the coroutine source code; for example,
a typical state string might be ".{.<-2.await__then", which
can be read like "in the first argument of \{, in the second
argument of <-, in a call to await(), at internal node then.";
envir: the environment where the coroutine is evaluating R expressions;
err: the error object, if the coroutine caught an error.
summary(g)$state for a generator g might be "yielded",
"running" (if nextElem is currently being called,) "stopped" (for
generators that have stopped with an error,) or "finished" (for
generators that have finished normally.)
summary(a)$state of an async might be "pending", "resolved" or
"rejected".
summary(s)$state on a stream might be "resolved",
"rejected", "running", "woken", "yielding", or "yielded".
# S3 method for coroutine
format(x, ...)# S3 method for coroutine
summary(object, ...)
# S3 method for generator
summary(object, ...)
# S3 method for async
summary(object, ...)
# S3 method for stream
summary(object, ...)
A coroutine.
Undocumented.
a coroutine (async, generator, or stream) object.