issue with new file creation when the function is defined in position [1,1]

[danwwilson]

In RStudio when the a function is at position [1,1] in a document and fn_mate() is called to create a function in a new file it throws an error because of some strange truncation.

my_function(test)

gives an error

Error in parse(text = elt) : <text>:2:0: unexpected end of input
1: y_function(test

You can see it is missing the first and last characters.

In VScode, the behavior is different in that the file and function would be created, but instead it will create a file called y_function.R with a function y_function()