How to map  in vim? I would like to map ctrl+leader key. Is it possible?
Tried: :nnoremap <c-leader> :CtrlP<CR>
And it does not work.
(ctrlp bindings conflict with yankring bindings)

There are two issues, here:


*

*You didn't read CtrlP's documentation where you would have found this:
Use this option to change the mapping to invoke CtrlP in Normal mode:
    let g:ctrlp_map = '<c-p>'


*<leader> is supposed to be a cross-platform alternative to using the common modifier keys (Alt, Ctrl, Shift, Cmd) in mappings.
Normally, you would use <leader> in place of <Ctrl> as in:
nnoremap <leader>p :CtrlP<CR>

This line in your ~/.vimrc will probably solve your problem:
let g:crtlp_map='<F11>'

Though it won't help much here are my mappings for CtrlP:
nnoremap <leader>f :CtrlP<CR>
nnoremap <leader>b :CtrlPBuffer<CR>
nnoremap <leader>m :CtrlPMRUFiles<CR>
nnoremap <leader>t :CtrlPTag<CR>


<Leader> is a special key notation in Vim; as such, it cannot be combined with modifiers such as C-. Assuming the default setting for it (i.e. \), you can use this:
nnoremap <c-\> :CtrlP<CR>


For example to map leader key to space try this ...
let mapleader=" "