Compiler.print() panics with "position 50 does not resolve to a source location"

[JanKaul]

Hello,

I'm using rust to parse a js module into an ast that I use for an interpreter. In certain cases I would like to turn a part of the ast into js code again. I'm using the Compiler.print() method for that.
This works great but when the code contains a ArrayLiteral like "[1,2]" the process panics with "position 50 does not resolve to a source location".
It seems to come from swc_common/source_map.rs:906.
I don't really understand why the compiler wants to access a sourcefile. And since I only want to print a part of the ast, I don't really have a source file.
Do you have an idea how I could avoid this problem. I would really appreciate the help.

Great project btw.