fix for &str

serde_avro_derive/src/lib.rs

@@ -71,7 +71,7 @@ impl SchemaBuilder {
 		idx
 	}
 
-	pub fn find_or_build<T: BuildSchema>(&mut self) -> SchemaKey {
+	pub fn find_or_build<T: BuildSchema + ?Sized>(&mut self) -> SchemaKey {
 		match self
 			.already_built_types
 			.entry(TypeId::of::<T::TypeLookup>())

serde_avro_derive/tests/basic.rs → serde_avro_derive/tests/derive_schema.rs

@@ -132,6 +132,7 @@ fn complex() {
 struct Generics<'a, F> {
 	s1: F,
 	s2: &'a F,
+	s: &'a str,
 }
 
 #[test]

serde_avro_derive_macros/src/schema.rs

@@ -79,9 +79,8 @@ pub(crate) fn schema_impl(input: SchemaDeriveInput) -> Result<TokenStream, Error
 			// 'static otherwise it won't implement `Any`, so we need to generate a
 			// dedicated struct for it.
 			let type_lookup_ident = format_ident!("{ident}TypeLookup");
-			let type_params: Vec<syn::Ident> = (0..generics.params.len())
-				.map(|i| format_ident!("T{}", i))
-				.collect();
+			let type_params: Vec<syn::Ident> =
+				(0..fields.len()).map(|i| format_ident!("T{}", i)).collect();
 			let struct_decl = syn::ItemStruct {
 				attrs: Default::default(),
 				vis: syn::Visibility::Inherited,