guard syntax

[Ulf Wiger (AL/EAB)]

Is there a profound reason why I can't write a guard like this:

  is_one(X) when erlang:'=='(X,1) -> true;
  is_one(X) -> false.

Since this works:

  is_one(X) when X == 1 -> true;
 ...

and erlang:'=='(X,1) and X == 1 appear to be the same thing?

(And yes, I happen to have a certain case where it would be
convenient -- not that I couldn't live without it  =)

/Uffe