Strip casts in checkValidInstHead
This patch addresses Trac #11464. The fix is a bit crude (traverse the type to remove CastTys), but it's also simple. See Note [Casts during validity checking] in TcValidity
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This patch addresses Trac #11464. The fix is a bit crude (traverse the type to remove CastTys), but it's also simple. See Note [Casts during validity checking] in TcValidity