Overloading relational operators separately; thoughts?

[Minty Fresh via Digitalmars-d]

On Wednesday, 28 September 2016 at 04:02:59 UTC, Walter Bright 
wrote:
> The use of them to create DSLs (a technique called "expression 
> templates" in C++) is discouraged in D, for several reasons. 
> The recommended way to create DSLs in D is to parse strings 
> using CTFE.

I don't really come from a C++ background. Actually, I have a 
strong distaste for the language. Professionally, I word with 
Ruby.

Again, string DSLs face a number of issues. A few that come to 
mind are:
   1. A parser + code generator must be implemented, which is a 
lot of additional work.
   2. The quality and precision of error messages degrades.
   3. You loose the ability to perform actions like making 
declarations within the context of the DSL (ie. assigning a 
commonly re-used expression to a variable), unless your DSL is 
turing complete.

> An excellent example of that is the std.regex package.

You know, if someone had managed to implement a regex DSL using 
operator overloading, something must have gone _terribly_ wrong. 
Regex is traditionally done in strings, lest the language 
supports regex literals.