<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial,helvetica,sans-serif;font-size:12pt">Hi,<br><br>I've defined the following datatype with haskell<br><br>data Graph a b = Empty | Context a b & Graph a b<br><br>But I am having the error message: " parse error on input `&' ".<br>I am wondering what it is wrong with my definition. How can I fix this?<br>Thanks in advance.<br><br><br><span style="font-weight: bold; color: rgb(0, 64, 127);"><span style="font-style: italic;">Kind regards</span></span></div><br>
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