The following code illustrates a bug in hugs' implementation of layout:
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class C a where
f = f
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To which hugs98 replies:
Prelude> :l test41.hs
Reading file "test41.hs":
ERROR "test41.hs" (line 2): No member "f" in class "C"
According to the layout rule, the code should be parsed as:
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{class C a where {
}f = f}
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i.e. an empty class declaration followed by a top-level binding. The reason
is that in Haskell 98 the layout rule now explicitly states that nested
layout scopes should be strictly increasing in indentation.
Yes, I went looking for this bug because I suspected it was there :-)
Cheers,
Simon
