Looks like some of the tests have been failing for a while on this bot:
**09:32:22** Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Equality
**09:32:22** Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Initializers
**09:32:22** Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Bits
**09:32:22** Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Iteration
**09:32:22** Swift-Unit :: AST/./SwiftASTTests/IndexSubset.SupersetAndSubset
**09:32:22** Swift-Unit :: AST/./SwiftASTTests/IndexSubset.Insertion