programmatic async function creation about coro HOT 3 OPEN

inject() is a valid approach to metaprogramming. But I wonder, from what information would you generate the formals? I think you're looking for the equivalent of rlang::new_function() where you'd pass formals, env, and body individually?

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Right, I was looking exactly for something analogous to rlang::new_function. I was trying to modify the formals via formals but that seems to not work as expected, and also drops the aync function class

As an aside, I don't mean to suggest inject is hacky, more that it feels like a workaround. Technically I can create an anonymous function through rlang::new_function, but that will end up as a name when passed to assert_lambda

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The tricky part is that async() takes calls to function instead of evaluated functions.

These calls are a bit tricky, see as.list(quote(function(foo) bar)) for the contents. The second element is a pairlist not a list.
If you create a call following this structure (e.g. turn the result of the previous example back to a call with as.call()), then you can inject it inside async().

I agree a new_ function would be much better.

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