Add test

crates/macro/src/derive_props/builder.rs

@@ -65,7 +65,7 @@ impl ToTokens for PropsBuilder<'_> {
 
             #[doc(hidden)]
             #vis struct #builder_name#step_generics
-            #where_clause
+                #where_clause
             {
                 wrapped: ::std::boxed::Box<#wrapper_name#ty_generics>,
                 _marker: ::std::marker::PhantomData<#step_generic_param>,

tests/derive_props/pass.rs

@@ -83,4 +83,22 @@ mod t5 {
     }
 }
 
+mod t6 {
+    use super::*;
+    use std::str::FromStr;
+
+    #[derive(Properties, Clone)]
+    pub struct Props<T: FromStr + Clone>
+    where
+    <T as FromStr>::Err: Clone,
+    {
+        #[props(required)]
+        value: Result<T, <T as FromStr>::Err>,
+    }
+
+    fn required_prop_generics_with_where_clause_should_work() {
+        Props::<String>::builder().value(Ok(String::from(""))).build();
+    }
+}
+
 fn main() {}