Pattern Matching - Streams

  enum: #Function<59.58486609/2 in Stream.transform/3>,
  funs: [#Function<47.58486609/1 in>,
   #Function<47.58486609/1 in>]

How does on pattern match against this stream in a guard clause?

Since the steam type is private, you should match only on the fact that its a %Stream{} struct.

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If you want to make sure that the input to your function is a stream, you could do the following:

def my_function(stream) when is_struct(stream, Stream), do: # something

Alternatively, you could define your own guard:

defguard is_stream(stream) when is_struct(stream, Stream)