Add flag -fwarn-duplicate-constraints
This fixes Trac #7541, and is on by default. Use -fno-warn-duplicate-constraints to switch it off.
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- compiler/main/DynFlags.hs 4 additions, 1 deletioncompiler/main/DynFlags.hs
- compiler/typecheck/TcMType.lhs 5 additions, 4 deletionscompiler/typecheck/TcMType.lhs
- docs/users_guide/flags.xml 7 additions, 0 deletionsdocs/users_guide/flags.xml
- docs/users_guide/using.xml 19 additions, 0 deletionsdocs/users_guide/using.xml
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