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This is awesome! Fortran is still in use in many of the "hard" sciences. It will probably take several years, but this may mean we could consider deprecating one of the compilers we have to maintain for people.

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According to TIOBE, Fortran is more popular than Google's Dart and Mozilla's Rust. Not to mention Kotlin, Lisp, and Erlang.

Fortran used to be more popular. However, TIOBE is a lacking indicator, as stated here: http://pypl.github.io/PYPL.html (do a in-page-search with "Why is PYPL so different from TIOBE ?") Some other indicators such as Redmonk ( https://redmonk.com/sogrady/2019/03/20/language-rankings-1-1... ) show that both Dart and Rust are more popular than Fortran. (Although each of them have their own set of biases.)

I think you mean lagging indicator.

While the page they link to uses "lagging", "lacking" actually seems to fit better with the context it's used in there:

The paragraph it's used in ("Why is PYPL so different from TIOBE ?") seems to argue that TIOBE is lacking, not lagging.

Any sufficiently lagging indicator is also a lacking indicator.

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