add occurence errros

Peternator7 · Feb 26, 2023 · 2d47a85 · 2d47a85
1 parent 453b76a
commit 2d47a85
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/strum_macros/src/helpers/inner_variant_props.rs b/strum_macros/src/helpers/inner_variant_props.rs
@@ -1,4 +1,5 @@
 use super::metadata::{InnerVariantExt, InnerVariantMeta};
+use super::occurrence_error;
 use syn::{Field, LitStr};
 
 pub trait HasInnerVariantProperties {
@@ -14,9 +15,14 @@ impl HasInnerVariantProperties for Field {
     fn get_variant_inner_properties(&self) -> syn::Result<StrumInnerVariantProperties> {
         let mut output = StrumInnerVariantProperties { default_with: None };
 
+        let mut default_with_kw = None;
         for meta in self.get_named_metadata()? {
             match meta {
-                InnerVariantMeta::DefaultWith { kw: _, value } => {
+                InnerVariantMeta::DefaultWith { kw, value } => {
+                    if let Some(fst_kw) = default_with_kw {
+                        return Err(occurrence_error(fst_kw, kw, "default_with"));
+                    }
+                    default_with_kw = Some(kw);
                     output.default_with = Some(value);
                 }
             }