Check if named type requires a lifetime and conform if does

crates/wiggle/generate/src/types/struct.rs

@@ -19,7 +19,14 @@ pub(super) fn define_struct(
     let member_decls = s.members.iter().map(|m| {
         let name = names.struct_member(&m.name);
         let type_ = match &m.tref {
-            witx::TypeRef::Name(nt) => names.type_(&nt.name),
+            witx::TypeRef::Name(nt) => {
+                let tt = names.type_(&nt.name);
+                if m.tref.needs_lifetime() {
+                    quote!(#tt<'a>)
+                } else {
+                    quote!(#tt)
+                }
+            },
             witx::TypeRef::Value(ty) => match &**ty {
                 witx::Type::Builtin(builtin) => names.builtin_type(*builtin, quote!('a)),
                 witx::Type::Pointer(pointee) | witx::Type::ConstPointer(pointee) => {

crates/wiggle/tests/structs.rs

@@ -52,6 +52,10 @@ impl<'a> structs::Structs for WasiCtx<'a> {
             second: *second,
         })
     }
+
+    fn sum_array<'b>(&self, an_arr: &types::StructOfArray<'b>) -> Result<u16, types::Errno> {
+        Ok(0)
+    }
 }
 
 #[derive(Debug)]