Execute a function call similar to do.call, but without
deparsing function arguments.
do_call(what, args, pkg = NULL)Either a function or a non-empty character string naming the function to be called.
A list of arguments to the function call. The names attribute of
args gives the argument names.
Optional name of the package in which to search for the
function if what is a character string.
The result of the (evaluated) function call.