"Come across" in this sense is apparently still considered non-standard, but you hear it used like this in the US. Your sentence is theoretically grammatical (although non-standard), but the phrase is not used like this (the person that one "comes across" is typically in the third person). Some examples of usage: I came across this guy from my 4th grade class at the convention.
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Anonymous"Come across" in this sense is apparently still considered non-standardAre you saying that this phrase, when applied just to people, is non-standard?