%<a-%                   Create an active binding.
%<c-%                   Create a constant (locked) binding.
%<d-%                   Create an delayed binding.
bytes                   Print the byte-wise representation of a value
call_tree               Display a call (or expression) as a tree.
compose                 Compose multiple functions
dots                    Capture unevaluated dots.
enclosing_env           Find the environment that encloses of a
                        function.
explicit                Tools for making promises explicit
f                       A compact syntax for anonymous functions.
fget                    Find a function with specified name.
find_funs               Find functions matching criteria.
find_uses               Find all functions in that call supplied
                        functions.
ftype                   Determine function type.
is_active_binding       Active binding info
is_promise              Promise info
make_call               Make and evaluate calls.
make_function           Make a function from its components.
mem_change              Determine change in memory from running code
mem_used                How much memory is currently used by R?
method_from_call        Given a function class, find correspoding S4
                        method
modify_call             Modify the arguments of a call.
modify_lang             Recursively modify a language object
object_size             Compute the size of an object.
otype                   Determine object type.
parent_promise          Find the parent (first) promise.
parenv                  Get parent/ancestor environment
parenvs                 Given an environment or object, return an
                        'envlist' of its parent environments.
partial                 Partial apply a function, filling in some
                        arguments.
rebind                  Rebind an existing name.
rls                     Recursive ls.
sexp_type               Inspect internal attributes of R objects.
show_c_source           Find C source code for internal R functions
standardise_call        Standardise a function call
subs                    A version of substitute that works in the
                        global environment.
substitute_q            A version of substitute that evaluates its
                        first argument.
track_copy              Track if an object is copied
unenclose               Unenclose a closure.
uneval                  Capture the call associated with a promise.
where                   Find where a name is defined.
