The environment in which the evaluation
is done (or inherits from if local is TRUE).
substitute
If TRUE, argument expr is
substitute():ed, otherwise not.
local
If TRUE, the expression is evaluated such that
all assignments are done to local temporary environment, otherwise
the assignments are done in the calling environment.
...
Additional named elements of the future.
Value
An object of class LazyFuture.
See Also
To evaluate an expression using "lazy future", see function
lazy().