Formatter placeholder `{fn}` sometimes prints function body not function name from within `do.call`

[PuzzledFace]

#20 appears related.

When called within do.call, the {fn} placeholder prints the body of the the called function, not its name. Here is a MRE.

> log_layout(layout_glue_generator(format = '{fn}: {msg}'))
> myFunc <- function() {
+   log_info("Hello")
+ }
> myFunc()
myFunc: Hello

But

> do.call(myFunc, list())
function () { log_info("Hello") }: Hello

However

> do.call("myFunc", list())
myFunc: Hello

Consistent behaviour would be good, behaviour as per "function name as character string" would be ideal!

[daroczig]

When running do.call(myFunc, list()), the myFunc function name will not be known to logger because myFunc is evaluated first, and only its "value" (the actual fn) is being called by do.call and so thus tracked by logger.

I don't think this can be solved within the logger world.