string interpolation fun

[Steven Schveighoffer]

On 12/13/18 11:21 AM, Jonathan Marler wrote:

> Adding support for the `$foo` case (no parens) would be fairly trival, 
> but requires making a decision of what type of grammar node/token to 
> use.  We could use the same mechanism that templates use, but that would 
> mean that something like $foo.max would be $(foo).max instead of 
> $(foo.max) which seems a bit unexpected.  That would be a good thing 
> include in the DIP, a list of the obvious tokens/grammar nodes we could 
> use and their pros/cons.

Yeah, I would recommend $foo.max be $(foo.max). This isn't like 
templates, where the dot is meaningful both ways.

-Steve