@nogc and Phobos

[bomat]

Hi all,

I am a C++ programmer in my "day job" and was playing around with 
D to maybe use it in a personal project.

I'm using Dear ImGui for the graphical user interface, for which 
I use this port:
https://github.com/KytoDragon/imgui/

It works fairly well so far, just one problem: Dear ImGui is 
obviously `@nogc`, and I noticed that it doesn't mix with 
standard library functions.
I tried `std.process.executeShell()` (which I'd kinda need for my 
project unless I want do do OS specific API calls), and 
`std.stdio.writeln()` (which I won't exactly be needing, just as 
a very basic test).

So my question is:
Is Phobos essentially incompatible to `@nogc`?
Or is there a trick for mixing GC code with non-GC code that I 
don't know?

I'm assuming the second, for if the first was true I'd say that D 
would be pretty much useless when combined with non-D libs...