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Attempting C-c C-RET gives me the following:

C-c RET is undefined

Any thoughts on what is happening here?

marked as duplicate by phils, Drew, Stefan, npostavs, zck Feb 15 '18 at 21:52

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You don't say where you are doing that. What's the current mode?

But it looks like your terminal does not support the key sequence C-RET, and so treats it as RET.

Try C-h k C-RET. It will likely tell you what RET is bound to.

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