1 files changed, 28 insertions, 0 deletions
diff --git a/third_party/rust/ron/src/extensions.rs b/third_party/rust/ron/src/extensions.rs
new file mode 100644
index 0000000000..39357ac7df
--- /dev/null
+++ b/third_party/rust/ron/src/extensions.rs
@@ -0,0 +1,28 @@
+use serde::{Deserialize, Serialize};
+
+bitflags::bitflags! {
+    #[derive(Serialize, Deserialize)]
+    pub struct Extensions: usize {
+        const UNWRAP_NEWTYPES = 0x1;
+        const IMPLICIT_SOME = 0x2;
+        const UNWRAP_VARIANT_NEWTYPES = 0x4;
+    }
+}
+
+impl Extensions {
+    /// Creates an extension flag from an ident.
+    pub fn from_ident(ident: &[u8]) -> Option<Extensions> {
+        match ident {
+            b"unwrap_newtypes" => Some(Extensions::UNWRAP_NEWTYPES),
+            b"implicit_some" => Some(Extensions::IMPLICIT_SOME),
+            b"unwrap_variant_newtypes" => Some(Extensions::UNWRAP_VARIANT_NEWTYPES),
+            _ => None,
+        }
+    }
+}
+
+impl Default for Extensions {
+    fn default() -> Self {
+        Extensions::empty()
+    }
+}