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JINMEI Tatuya authored
this is remaining open point from #2375. The comment was added at commit 33a3143c, and it's been the same since the introduction. Aside from the fact that the sentence is incomplete, IMO the comment doesn't provide any meaningful information; it's obvious that "the source is not available" if source_ is NULL. Even if we complete the sentence by adding, e.g, "(then) throw InvalidOperation", it still doesn't provide any additional information than the code itself. So my decision is to to simply clean it up.
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