code: function isUsingIterationVar (vIf) {
    const element = vIf.parent.parent
    return vIf.value.references.some(reference =>
      element.variables.some(variable =>
        variable.id.name === reference.id.name &&
        variable.kind === 'v-for'
      )
    )
  }
docs: ------------------------------------------------------------------------------ Helpers ------------------------------------------------------------------------------ 
  Check whether the given `v-if` node is using the variable which is defined by the `v-for` directive.
  @param {ASTNode} vIf The `v-if` attribute node to check.
  @returns {boolean} `true` if the `v-if` is using the variable which is defined by the `v-for` directive.