function setFormValue(state, _ref) {
	  var formId = _ref.formId;
	  var fieldName = _ref.fieldName;
	  var value = _ref.value;

	  var formEntry = state.get(formId);

	  if (!formEntry) {
	    throw new Error("FormStore: cannot find form by formId=" + formId);
	  }

	  return state.setIn([formId, "currentValues", fieldName], value);
	}
@param {Immutable.Map} state
@param {Object} payload
@param {String} payload.formId
@param {String} payload.fieldName
@param {String} payload.value
@return {Immutable.Map}