1 files changed, 36 insertions, 0 deletions
diff --git a/third_party/rust/derive_more-impl/src/mul_helpers.rs b/third_party/rust/derive_more-impl/src/mul_helpers.rs
new file mode 100644
index 0000000000..dbc1c6257c
--- /dev/null
+++ b/third_party/rust/derive_more-impl/src/mul_helpers.rs
@@ -0,0 +1,36 @@
+use crate::utils::{add_where_clauses_for_new_ident, MultiFieldData, RefType};
+use proc_macro2::TokenStream;
+use quote::quote;
+use syn::{Generics, Ident};
+
+pub fn generics_and_exprs(
+    multi_field_data: MultiFieldData,
+    scalar_ident: &Ident,
+    type_where_clauses: TokenStream,
+    ref_type: RefType,
+) -> (Generics, Vec<TokenStream>) {
+    let MultiFieldData {
+        fields,
+        casted_traits,
+        members,
+        method_ident,
+        ..
+    } = multi_field_data;
+    let reference = ref_type.reference();
+    let exprs: Vec<_> = casted_traits
+        .iter()
+        .zip(members)
+        .map(|(casted_trait, member)| {
+            quote! { #casted_trait::#method_ident(#reference #member, rhs) }
+        })
+        .collect();
+
+    let new_generics = add_where_clauses_for_new_ident(
+        &multi_field_data.state.input.generics,
+        &fields,
+        scalar_ident,
+        type_where_clauses,
+        true,
+    );
+    (new_generics, exprs)
+}