collect_from_args: Collect attributes set in the arguments to a call expression.
In mailund/foolbox: Function Manipulation Toolbox

Given a call expression expr, this function scans the arguments to the call and extracts the attribute attribute from each where the condition predicate evaluates to TRUE, and it concatenates all these.

1 2	collect_from_args(expr, attribute, condition = function(expr) TRUE, include_fun = FALSE)

`expr`	The expression to process.
`attribute`	The attribute we want to collect from the arguments.
`condition`	A predicate. Only arguments where the condition evaluates to `TRUE` will be included in the result.
`include_fun`	Include the first element in a call, i.e. the function that will be called.