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IDK, Python was fine grabbing list comprehensions from Haskell, yield and coroutines from, say, Modula-2, the walrus operator from, say, C, large swaths from Smalltalk, etc. It does not matter if the languages are related; what matters is whether you can make a feature / approach fit the rest of the language.

Generalized do notation as GP is proposing requires HKT. I don't think it's controversial to say that Go will not be getting HKT.

The := is from Pascal, not C.

Afaik the F# supports do notation through computation expressions.

Like Rust, F# doesn't have higher-kinded types so it's not generalized like GP is proposing. Each type of computation expression is tied to a specific monad/applicative.

hahaha :D