{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
    let impl_ = ctx.find_node_at_offset::<ast::Impl>()?;
pub(crate) fn convert_from_to_tryfrom(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let trait_ty = impl_.trait_()?;