fix: event macro (AztecProtocol#3784)

Fixes AztecProtocol#3655

Author: benesjan

noir/aztec_macros/src/lib.rs

@@ -486,8 +486,8 @@ const SIGNATURE_PLACEHOLDER: &str = "SIGNATURE_PLACEHOLDER";
 /// Inserts the following code:
 /// ```noir
 /// impl SomeStruct {
-///    fn selector() -> Field {
-///       aztec::oracle::compute_selector::compute_selector("SIGNATURE_PLACEHOLDER")
+///    fn selector() -> FunctionSelector {
+///       aztec::selector::compute_selector("SIGNATURE_PLACEHOLDER")
 ///    }
 /// }
 /// ```
@@ -503,13 +503,18 @@ fn generate_selector_impl(structure: &NoirStruct) -> TypeImpl {
         vec![expression(ExpressionKind::Literal(Literal::Str(SIGNATURE_PLACEHOLDER.to_string())))],
     )))]);
 
+    // Define `FunctionSelector` return type
+    // TODO(https://github.com/AztecProtocol/aztec-packages/issues/3590): Make this point to aztec-nr once the issue is fixed.
+    let return_type_path = chained_path!("protocol_types", "abis", "function_selector", "FunctionSelector");
+    let return_type = FunctionReturnType::Ty(make_type(UnresolvedTypeData::Named(return_type_path, vec![])));
+
     let mut selector_fn_def = FunctionDefinition::normal(
         &ident("selector"),
         &vec![],
         &[],
         &selector_fun_body,
         &[],
-        &FunctionReturnType::Ty(make_type(UnresolvedTypeData::FieldElement)),
+        &return_type,
     );
 
     selector_fn_def.visibility = FunctionVisibility::Public;

yarn-project/noir-contracts/src/contracts/test_contract/src/main.nr

@@ -6,6 +6,11 @@ contract Test {
         AztecAddress,
         EthAddress,
     };
+    // The following import is here in order to make the event macro work because the macro doesn't add the import.
+    // It doesn't add the import because in the future we will re-export all the types via aztec-nr and aztec-nr is
+    // already auto-imported by the macros.
+    // TODO(https://github.com/AztecProtocol/aztec-packages/issues/3590): Remove this once the issue is fixed.
+    use dep::protocol_types;
     // docs:start:unencrypted_import
     use dep::aztec::log::emit_unencrypted_log;
     // docs:end:unencrypted_import
@@ -32,18 +37,17 @@ contract Test {
     use dep::token_portal_content_hash_lib::{get_mint_private_content_hash, get_mint_public_content_hash};
     use dep::field_note::field_note::{FieldNote, FieldNoteMethods, FIELD_NOTE_LEN};
 
-    // TODO(benesjan) https://github.com/AztecProtocol/aztec-packages/issues/3655
-    // #[event]
-    // struct ExampleEvent {
-    //     value: Field,
-    // }
+    #[event]
+    struct ExampleEvent {
+        value: Field,
+    }
 
     struct Storage {
         example_constant: ImmutableSingleton<FieldNote, FIELD_NOTE_LEN>,
     }
 
     impl Storage {
-        fn init(context: Context) -> pub Self {
+        fn init(context: Context) -> Self {
             Storage {
                 example_constant: ImmutableSingleton::new(context, 1, FieldNoteMethods),
             }