I’m happy to announce Underscores.jl, a small but general package for _ placeholder syntax which makes it easier to pass anonymous functions to other functions.  The package provides a single @_ macro which is helpful in writing anonymous functions succinctly without naming the arguments. Some examples:      Expression Meaning     @_ map(_+1, a) map(x->x+1, a)   @_ map(_+2^_, a)  map((x)->x+2^x, a)  (NOTE)   @_ map(_2/_1, a, b) map((x,y)->y/x, a, b)   @_ func(a,__,b) x->func(a,x,b)   @_ data |> ...

This PR addresses #554, #5571, and #22710 by "currying" underscores in function calls like f(_,y) into anonymous function expressions x -> f(x,y).  (Note that _.foo works a...