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fix nightly rustdoc-extern tests
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src/cargo/core/compiler/rustdoc.rs

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@@ -52,7 +52,8 @@ impl<'de> serde::de::Deserialize<'de> for RustdocExternMode {
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}
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}
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#[derive(serde::Deserialize, Debug)]
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#[derive(serde::Deserialize, Debug, Default)]
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#[serde(default)]
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pub struct RustdocExternMap {
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registries: HashMap<String, String>,
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std: Option<RustdocExternMode>,

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