How to fetch value pointed by a C++ std::list iterator?

[kaushalmodi]

@sls1005

> `{.importcpp: "(*#)".}`

I cannot find this in the manual. What should I search for to look for 
specifically this syntax? I looked at 
<https://nim-lang.github.io/Nim/manual.html#noalias-pragma-importcpp-pragma>.