The Hugs 98 User's Guide | ||
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These experimental features are unique to Hugs. Except of the debugging primitives, they require the -98 option.
Trex is a very powerful and flexible record system. See Section 7.2 of the Hugs 98 User Manual for details.
To use equality and show on extensible records, a module must import Hugs.Trex. This module also defines an empty record value and type:
emptyRec :: Rec EmptyRow |
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Implicit parameters | Restricted type synonyms |