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Error messages from FunctionInterpolation (bug?)


I know that this is a misuse of FunctionInterpolation, but this should 
not happen:

In[1]:=
sin = f/.First@NDSolve[{f''[x]+f[x]==0,f[0]==0,f'[0]==1},f,{x,0,10}]

Out[1]= InterpolatingFunction[{{0.,10.}},<>]

In[2]:= FunctionInterpolation[sin[x],{x,0,10}]

During evaluation of In[2]:= Take::take: Cannot take positions 1 through 
3 in {1,1}. >>
During evaluation of In[2]:= Take::take: Cannot take positions 1 through 
3 in {1.,1.}. >>
During evaluation of In[2]:= Take::take: Cannot take positions 1 through 
3 in {1,1}. >>
During evaluation of In[2]:= General::stop: Further output of Take::take 
will be suppressed during this calculation. >>

Out[2]= InterpolatingFunction[{{0,10}},<>]






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