syntax error message in f-string doesn't report line number

I accidentally came across this annoying 'feature' or more likely, bug.

The following code
   f"...foo ... {**kwargs} ..."
produces a very basic syntax error message with no line number in the source file:

  File "<fstring>", line 1
    (**kwargs)
      ^
SyntaxError: invalid syntax

This is the error message I would expect from the interpreter, but not when running a python script. A demo script is as follows:

    ''' f-string bug demonstration '''

    def main(*args, **kwargs):
        print(f"main() called with *args={*args}, **kwargs={**kwargs}")

With a longer python file, it is hard to find the offending line. Should the line number be displayed in the error message?

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: python3 3.7.5-1
ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 11 17:08:35 2020
SourcePackage: python3-defaults
UpgradeStatus: Upgraded to eoan on 2019-10-23 (170 days ago)