[swift-evolution] multi-line string literals.

[Erica Sadun]

> On Apr 28, 2016, at 4:52 PM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org> wrote:
> 
>> Did you ever really use multiline string literals before?
> 
> Yes. I used Perl in the CGI script era. Believe me, I have used every quoting syntax it supports extensively, including `'` strings, `"` strings, `q` strings, `qq` strings, and heredocs. This proposal is educated by knowledge of their foibles.
> 
> As outlined in the "Future directions for string literals in general" section, I believe alternate delimiters (so you can embed quotes) are a separate feature and should be handled in a separate proposal. Once both features are available, they can be combined. For instance, using the `_"foo"_` syntax I sketch there for alternate delimiters, you could say:
> 
> 	let xml = _"<?xml version="1.0"?>
> 	            "<catalog>
> 	            " <book id="bk101" empty="">
> 	            "     <author>\(author)</author>
> 	            " </book>
> 	            "</catalog>"_

Other than the underscores (I'm not sold on them but I could live with them), this is my favorite approach:

* It supports indented left-hand alignment, which is an important to me for readability
* It avoids painful `\n"+` RHS constructions
* It's easy to scan and understand
* It's simple and harmonious

-- E