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I've mapped control-m to start the Syntastic check mode (Active/Passive)

nnoremap <c-m> :SyntasticToggleMode<Cr>

But in normal mode, when I tap the return key, it also toggles the mode. When removing the mapping line above, the problem is off. Any clue of that?

Thanks

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    The keycode of the return key is ^M just like <c-m> See the Remember that some key combinations are equivalent in the duplicate question. – statox Jan 18 '18 at 10:36
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    For more information on why CTRL-M and Return equivalent, see Terminals are Weird, and if you're wondering why CTRL-M and Return are still equivalent, see this discussion on the vim_dev list. – Rich Jan 18 '18 at 10:52

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