trunk: add tast_helper
trunk: add tast_helper

ocaml/merlin,ocaml/merlin,haselwarter/merlin,chambart/merlin,dra27/merlin,neojski/merlin,dra27/merlin,chambart/merlin,rgrinberg/merlin,fxfactorial/merlin,rgrinberg/merlin,dra27/merlin,the-lambda-church/merlin,neojski/merlin,rgrinberg/merlin,the-lambda-church/merlin,haselwarter/merlin,fxfactorial/merlin,fxfactorial/merlin,ocaml/merlin,rgrinberg/merlin,chriskonstad/merlin,haselwarter/merlin,fxfactorial/merlin,neojski/merlin,chambart/merlin,chambart/merlin,the-lambda-church/merlin,ocaml/merlin,chriskonstad/merlin,dra27/merlin,neojski/merlin,haselwarter/merlin