D's string mixins are like Tcl's uplevel

[Ali Çehreli]

I came across this Tcl advocacy article on Reddit (the article is from 
2006):

 
https://www.reddit.com/r/programming/comments/8cw63d/tcl_the_misunderstood/

"Everything is a string" concept of Tcl reminded me of how D can 
generate code as string. So, Tcl's 'uplevel' is like string mixins. It's 
also similar to how body of 'static if' is inserted into this context.

Ali