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Robert Widmann 779276a0c6 Bail On Checking Invalid Precedence Group

When the user spells an invalid precedence group, the Relation for that
group will fail to resolve the decl. We need to handle this in
checkPrecedenceGroup. Also add some asserts while I'm here.

rdar://75248642

2021-03-11 12:40:23 -08:00

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 // RUN: not %target-swift-frontend -typecheck %s
 precedencegroup MyOperatorPrecedence {
   lowerThan: MultiplicationPrecedence
   higherThan: AdditionPrec
   associativity: left
   assignment: false
 }