newCTFE Status June 2020

[Stefan Koch]

Hi Guys,

I've ported newCTFE to the latest "stable" release of DMD 2.092.0.

While trying to test newCTFE on some std.regex code to see if it 
would make a difference there, I noticed that default 
construction of classes is broken.

This is because dmd is a little funky and does not generate a 
default construction-function for you.
Rather it leaves you to build your own.
(As far as I can see anyways.)

Which I then documented on a new wiki page were all of my more 
surprising discoveries about dmd will land.

[https://wiki.dlang.org/Random_DMD_Facts]

This promoted me to clean up my assignment-to-field code which 
was duplicated for structs and classes.

More such cleanup passes will happen and hopefully bring the 
code-size of newCTFE down considerably.