[PATCH] D144503: [ADT] Allow `llvm::enumerate` to enumerate over multiple ranges

[David Blaikie via Phabricator via llvm-commits]

dblaikie added a comment.

> Because the enumerate_result returned on dereference is a temporary, enumeration result can no longer be used through an lvalue ref.

Is it valid to have a value-returning iterator? (what about op->, which needs a pointer returned?) I thought that wasn't valid for most iterator categories & you had to resort to storing an object inside the iterator to return a pointer to in op*/op->


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