Vendor things

third-party/vendor/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,
+        }
+    }
+}