Re: Returning argument string (regexp-quote)

[Paul Eggert]

On 9/24/19 10:44 AM, Mattias Engdegård wrote:
> What about the specific case of regexp-quote then?
> It was responsible for a sizeable portion of local consing in some (non-public) 
> code I was profiling.
> Would the change need a mention in NEWS, and/or its doc string?

The performance case for regexp-quote is reasonably strong. This is 
similar to the 'format' function, which is called a lot, which does not 
allocate a string if its argument is simple, and where its callers are 
extremely unlikely to rely on its allocating a string in that case.

Changes should be mentioned in NEWS and the adjusted behavior should be 
mentioned in the manual; I don't think it needs to be in the doc string. 
Please see commit 2017-10-04T21:29:58Z!address@hidden for how the 
doc was done in the 'format' case.