[PATCH] D61015: [LibTooing] Change Transformer's TextGenerator to a partial function.

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov added a comment.

Why would we consider this a legitimate failure, rather than a programming error?
Same argument could be made about any form of format-string-like functions, e.g. `llvm::formatv` or `sprintf`.
Yet, they return strings and not `Expected<string>` or their equivalent.


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https://reviews.llvm.org/D61015