jspm_packages/npm/babel-core@5.8.38/lib/transformation/transformers/es6/parameters/rest.js
function BindingIdentifier(node, parent, scope, state) {
    if (node.name === state.name) {
      state.deopted = true;
    }
  }
function BindingIdentifier(node, parent, scope, state) {
    if (node.name === state.name) {
      state.deopted = true;
    }
  }
function BindingIdentifier ( node , parent , scope , state ) { if ( node . name === state . name ) { state . deopted = true ; } }
Deopt on use of a binding identifier with the same name as our rest param.

See https://github.com/babel/babel/issues/2091
Deopt on use of a binding identifier with the same name as our rest param .