construct reprex from call ?

[moodymudskipper]

construct_reprex() will construct the local environment entirely, that might be too much.

We could have a call argument, and we'd do as we did in {historian} :

• Turn all the things into lazy bindings
• Run the call
• Check what is not lazy anymore
• construct it

So when I'm debugging, right before a call, rather than calling construct_reprex(), we'd call construct_reprex(call = foo(x, a$b, bar(bar)), call is ignored if n is not default.