" Custom conceal
" syntax region todolist  start="^\s*[\+-\*x ]" end="\s" contained keepend


syntax match markdownConceal "\[\ \]" contained conceal cchar= 
syntax match markdownConceal "\[x\]"  contained conceal cchar=
syntax match markdownConceal "*"      contained conceal cchar=
syntax match markdownConceal "-"      contained conceal cchar=
syntax match markdownConceal "+"      contained conceal cchar=

syntax region 
       \ markdownItemization
       \ start="^\s*\(\[ \]\|[\+\-\*x]\)\s"
       \ end="\s"
       \ contains=markdownConceal


hi def link markdownConceal Todo
hi! link Conceal Text