[mercury-users] difference between is and =?

[Terrence Brannon]

in the last clause of this function, is is used instead of =. Why is
this? In fact, what is is?

float__pow(X, Exp) = Ans :-
	( Exp < 0 ->
		error("float__pow taken with exponent < 0\n")
	; Exp = 1 ->
		Ans =  X
	; Exp = 0 ->
		Ans = 1.0
	;
		New_e is Exp - 1,
		Ans is X * float__pow(X, New_e)
	).

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