Apply right wrapped function to argument on left.
# S3 method for UnaryFn
apply_left(
pipe_left_arg,
pipe_right_arg,
pipe_environment,
left_arg_name,
pipe_string,
right_arg_name
)
left argument should be a class derived from UnaryFn.
substitute(pipe_right_arg) argument, should evaluate to a class derived from UnaryFn.
environment to evaluate in
name, if not NULL name of left argument.
character, name of pipe operator.
name, if not NULL name of right argument.
result