Jedi, the excellent Python code completion library used by many editors and even ipython, now supports mypy annotations in Python 2! https://github.com/davidhalter/jedi/issues/946 🎉
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Is there any relationship between language adoption and the size of its standard library?
These days it seems completely orthogonal, but early Java adopters spoke highly of the collections library compared with C++.
Maybe it's the widespread availability of package managers?
Over a sufficiently long time horizon, all code you write is legacy code.
What are the most popular languages that have used an AST walker for their implementation?
I know Ruby used to do this, but there must be others.
(I'm interested in the lowest PL speed that users will tolerate if you have awesome features.)