A way to `lifecycle::deprecate_warn()` an R6 method

[colearendt]

Deprecating an R6 method does not currently work because the "function" being deprecated does not actually exist (but needs to be instantiated by initializing a class)

[hadley]

Minimal reprex:

A <- R6::R6Class("A", list(
  old_f = function() {
    lifecycle::deprecate_warn("1.0.0", "A$old_f()", "A$new_f()")
    self$new_f()
  },
  new_f = function() {
    "10"
  }
))
A$new()$old_f()
#> Error: Internal error: `what` must refer to a function name.

^{Created on 2021-01-08 by the reprex package (v0.3.0.9001)}

[kpagacz]

What about active bindings?

[hadley]

@kpagacz what about them? If there's a problem, please create a reprex and file a new issue.