bug#64939: 30.0.50; The default auto-mode-interpreter-regexp does not match env with flags

[Wilhelm Kirschbaum]

A file without an extension will load ruby-mode if the first line 
is:

   #!/usr/bin/env ruby

but not when the first line is:

   #!/usr/bin/env -S ruby -e 'puts 123'

Is there any reason why the latter should not be matched by the 
default
`auto-mode-interpreter-regexp' value in 'files.el'?


A more useful example I stumbled on today while working on a 
language
server after adding:

`(add-to-list 'interpreter-mode-alist '("elixir" 
. elixir-ts-mode))'


   #!/usr/bin/env -S elixir --erl "-kernel standard_io_encoding 
   latin1"

   Node.start(:"next-ls-#{System.system_time()}", :shortnames)
   ....



Wilhelm