python 3.8 and https://bugs.python.org/issue36817 (note no pep "was needed")
added self documenting expressions for f-strings

f"{a=}" is now short-hand for f"a={a}"

in the parser the self-documented syntax above generates the same expression nodes as the expanded version, which (i think?) means we can't distinguish them. i suppose we need to actually preserve this info in the ast, e.g. by adding self_documenting (currently a free var in the parser) to the node or similar