Hi, all.

I write a patch to allow Emacs reader interpret raw string.

As you know, we already has some special marker using `#` to make
Emacs reader work in a special way.  For example, we have `#[` to
indicate byte-compiled object and `#s(` to indicate hash-table.

I introduce raw string using this architecture, if users put `#r`
before string, Emacs reader interpret it as a raw string.

Many programming language has a Raw string feature[^1], so I want to
use raw string in Emacs-lisp.

To see more concrete example, please see the attached patch testcases.


^1: https://en.wikipedia.org/wiki/Comparison_of_programming_languages_(strings)#Quoted_raw


Regards,
Naoya