Comment #4 on issue 2091 by smichr: has() might need wild flag http://code.google.com/p/sympy/issues/detail?id=2091
should we have a totally different method, has_pattern()? I think a lot of code would be very surprised by the pattern matching behavior of has. e.g. if you had an expression with wilds in it and you sent it to solve, any place there was a test for expr.has(symbol) it would succeed *regardless of expression* if that symbol were a wild.
If sentiments are against this then I would recommend match=False be the default in has().
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