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Declaring a custom fixity for an infix data constructor should work: Prelude> data Infix a b = a :@: b; infixl 4 :@: This is a followup to #2947, which handled fixity declarations in ghci statements (e.g. let add = (+); infixl 6 `add`). Support for declarations (data, type, newtype, class, instance, deriving, and foreign) was added to GHCi in #4929. Reviewers: simonpj, austin, thomie Subscribers: thomie, bgamari Differential Revision: https://phabricator.haskell.org/D1028 GHC Trac Issues: #10018
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