I think I’ve been staring at pattern matches so long I’ve started to go blind. What I’d like to do is to inspect the code point for a character and then concatenate the character onto an accumulator.

iex> acc = ""
iex> <<x::utf8, rest::binary>> = "über"
iex> x
252  # <-- the code point
iex> acc <> <<x>>  # <-- how to concatenate the ü ?
<<252>>  
iex> acc == "ü"
false   # nope.

It’s like I need the opposite of the ? where I can convert a code point into a binary. Can someone illuminate me while I soak my head in coffee? Thanks!