When running the following code, 

R.<t>=FunctionField(QQ)
S.<x,y> = PolynomialRing(R,2)
I=S.ideal([x^2-y^2,y-t])
I.groebner_basis()

i am getting the following error: 

AttributeError: 'str' object has no attribute 'parent'

After checking other grobner basis algorithms, it seems to work using the toy 
algorithm. My first inclination is to go into multi_polynomial_ideal and 
add Attribute Error to its list of excepts, however I do not know enough about 
Function Field implementation to do this with sound mind. Would this fix be 
sufficient, or is this a deeper issue?

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