Nothing
## ----eval = FALSE-------------------------------------------------------------
# #' @export
# f = function () 'c$f'
## ----eval = FALSE-------------------------------------------------------------
# #' @export
# f = function () 'b$f'
#
# g = function () 'b$g'
## ----eval = FALSE-------------------------------------------------------------
# #' @export
# box::use(./b[g = f, ...])
#
# box::use(./c[...])
#
# #' @export
# box::use(./c)
#
# #' @export
# f = function () 'a$f'
#
# f_of_c1 = c$f
# f_of_c2 = get('f', parent.env(environment()))
# stopifnot(identical(f_of_c1, f_of_c2))
## ----eval = FALSE-------------------------------------------------------------
# box::use(a = ./a[f, g])
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