Python’s new t-strings

This is exactly how Nim is. The f-string like equivalent uses a macro called "fmt" which has a short alias "&". So you can say:

    import std/strformat
    let world = "planet"
    echo &"hello {world}"

The regular expression module does a similar thing with a `re"regular expression"` syntax or std/pegs with peg"parsing expression grammar" and so on. There are probably numerous other examples.

In general, with user-defined operators and templates and macros, Nim has all kinds of Lisp-like facilities to extend the language, but with a more static focus which helps for both correctness and performance.