warning: suggest parenthesis around assignment used as truth value

[G..]

I wonder why octave gives the following warning:

--------
octave:> warning("on", "all")
octave:> if (L = (1==1)), endif
warning: suggest parenthesis around assignment used as truth value
octave:>
--------

No warning if I use a 2nd pair of parenthesis: 

--------
octave:> if ((L = (1==1))), endif
octave:> 
--------

But isn't that last pair redundant?

G
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