[erlang-questions] Why I cannot use functions in gaurds

[Maruthavanan Subbarayan]

HI,
I would like to know  if the first one is valid why not the second one?
case L of
   {answer, N} when N == 42 -> true;
   _ -> false
 end.
case L of
   {answer, N} when N == M:F(A) -> true;
   _ -> false
 end. 		 	   		  
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