What does "std:" mean? (with one colon)

2 weeks ago 17
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I was removing using namespace std; from a codebase and was checking errors that popped to fix em

One of the errors came from std:cerr << "some cerr notice";

Somehow, when using namespace std; is enabled, this doesn't error out. See Godbolt

How does that work? What is it getting parsed as?

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