#16232: Add setField to HasField -------------------------------------+------------------------------------- Reporter: adamgundry | Owner: adamgundry Type: feature request | Status: new Priority: normal | Milestone: 8.10.1 Component: Compiler (Type | Version: 8.7 checker) | Resolution: | Keywords: ORF Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): You are right that does seem a bit tricky. Another possibility is generating renamed syntax when solving the constraint then type checking it and desugaring it using `tcExpr` and `dsExpr` to generate the necessary evidence? This is all possible to do in `ClsInst`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16232#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler