Single-quoted heredocs gives no deprecation warning in IEX

[AlternateRT]

Elixir and Erlang/OTP versions

Erlang/OTP 28 [erts-16.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1]

Elixir 1.19.5 (compiled with Erlang/OTP 28)

Operating system

macOS 15.7.3

Current behavior

The heredocs are only re-printed before being evaluated into their ~c sigil representation.

iex(1)> '''
...(1)> elixir
...(1)> '''
iex(1)> '''
        elixir
        '''
~c"elixir\n"

Expected behavior

This should give a deprecation warning message similar to the one you get when you try to use single-quoted strings.

iex(1)> '''
...(1)> elixir
...(1)> '''
warning: using single-quoted heredocs to represent charlists is deprecated.
Use ~c""" if you indeed want a charlist or use """ instead.
You may run "mix format --migrate" to change all single-quoted
heredocs to use the ~c sigil and fix this warning.
└─ iex:1:1
iex(1)> '''
        elixir
        '''
~c"elixir\n"