1 files changed, 15 insertions, 0 deletions
diff --git a/third_party/rust/thiserror-impl/src/span.rs b/third_party/rust/thiserror-impl/src/span.rs
new file mode 100644
index 0000000000..c1237ddfc5
--- /dev/null
+++ b/third_party/rust/thiserror-impl/src/span.rs
@@ -0,0 +1,15 @@
+use proc_macro2::Span;
+use syn::Member;
+
+pub trait MemberSpan {
+    fn member_span(&self) -> Span;
+}
+
+impl MemberSpan for Member {
+    fn member_span(&self) -> Span {
+        match self {
+            Member::Named(ident) => ident.span(),
+            Member::Unnamed(index) => index.span,
+        }
+    }
+}