Is there something wrong with complex atan in guile?

[Tommi Höynälänmaa]

I get the following results with guile 2.0.9:

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scheme@(guile-user)> (atan (tan -0.5+2.0i))
$1 = 1.070796326794897+1.9999999999999996i
scheme@(guile-user)> (tan (atan -0.5+2.0i))
$2 = 0.1176470588235294+0.4705882352941177i

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Although there are multiple branches in the complex atan function the previous results do not seem correct. Is there something wrong here.

     - Tommi