rust - Rust Geojson : expected enum found reference

Question

对于Rust来说还很陌生，我实际上是从此页面https://docs.rs/geojson/0.19.0/geojson/enum.Value.html#conversion-from-geo_types复制并粘贴示例，即:

let point = geo_types::Point::new(2., 9.);
assert_eq!(
geojson::Value::from(&point),
geojson::Value::Point(vec![2., 9.]),
);

我收到以下错误:

let point = geo_types::Point::new(2., 9.);

mismatched types

note:   expected enum `geojson::Value`
  found reference `&geo_types::Point<{float}>`rustc(E0308)

我的cargo.toml文件如下所示:

[dependencies]
polyline = "0.8.0"
geo-types = "0.6.0"
geojson = "0.19.0"

您能帮我吗，我看了看源代码，:: from位于要素geo_types的后面，但是由于我导入了库，所以我认为它可以工作...非常感谢!

Answer 1

您应该在geo-types中启用geojson功能

[dependencies]
polyline = "0.8.0"
geo-types = "0.6.0"
geojson = { version = "0.19.0", features = ["geo-types"] }