DIP 1027---String Interpolation---Community Review Round 1

[Walter Bright]

On 12/11/2019 2:37 PM, H. S. Teoh wrote:
> 1) Change the interpretation of `%({X}varname)` to mean "use `X` instead
> of %s as placeholder in output string", rather than "use `%X` ...".
> I.e.:
> 
> 	i"%abc"		== tuple("%s", abc);
> 	i"%({%x}abc)"	== tuple("%x", abc);
> 	i"%({?}abc)"	== tuple("?", abc); // bingo, SQL syntax!
> 
> 2) Then, in light of the %%%% problem, and to fix the repeated % in
> "%{%x}abc", change the default metacharacter to something like $:
> 
> 	i"$abc"		== tuple("%s", abc);
> 	i"$({%d}abc)"	== tuple("%d", abc);
> 	i"$({?}abc)"	== tuple("?", abc);

I agree, except don't need the extra ( ).