(ArgumentError) cannot escape #Reference<...>

[feld]

Elixir 1.18 / OTP28

** (ArgumentError) cannot escape #Reference<0.3971376573.3372613634.56542>. The supported values are: lists, tuples, maps, atoms, numbers, bitstrings, PIDs and remote functions in the format &Mod.fun/arity
    (elixir 1.18.4) src/elixir_quote.erl:554: :elixir_quote.argument_error/1
    (elixir 1.18.4) src/elixir_quote.erl:462: :elixir_quote.do_quote_simple_list/3
    (elixir 1.18.4) src/elixir_quote.erl:462: :elixir_quote.do_quote_simple_list/3
    (elixir 1.18.4) src/elixir_quote.erl:150: :elixir_quote.do_escape/2
    (elixir 1.18.4) src/elixir_quote.erl:170: :elixir_quote."-do_escape/2-lc$^1/1-0-"/3
    (elixir 1.18.4) src/elixir_quote.erl:171: :elixir_quote."-do_escape/2-lc$^1/1-0-"/3
    (elixir 1.18.4) src/elixir_quote.erl:171: :elixir_quote.do_escape/2
    (ex_const 0.3.0) lib/ex_const.ex:516: Const.eval_quoted_value/3

[feld]

The const we were trying to use is:

  const(mime_regex,
    do: ~r/^[^[:cntrl:] ()<>@,;:\\"\/\[\]?=]+\/[^[:cntrl:] ()<>@,;:\\"\/\[\]?=]+(; .*)?$/
  )

This used to work.