fix: detect serde attributes inside macros

src/source_parser.rs

@@ -403,6 +403,13 @@ impl SourceParser {
             }
         }
 
+        // A macro body keeps its attributes as plain tokens, so a
+        // `#[serde(with = "...")]` inside one never reaches `collect_meta_imports`.
+        // Here the `serde` ident is part of the stream, unlike an attribute's own path.
+        if tokens.iter().any(|token| token.kind() == SyntaxKind::IDENT && token.text() == "serde") {
+            self.collect_serde_attribute(token_tree);
+        }
+
         self.collect_path_imports(&tokens);
     }
 

src/tests.rs

@@ -115,6 +115,21 @@ fn serde_root_scoped_path() {
     test("#[serde(crate = \"::foo\")] struct Foo { bar: () }");
 }
 
+// A macro body keeps its attributes as tokens, so these never reach the `Attr` node
+// that `#[serde(...)]` is normally read from. Covers every key in
+// `is_serde_attribute_key`, including `crate`, which is a keyword rather than an ident.
+#[test]
+fn serde_attributes_inside_macro() {
+    // `macro_rules!` definition
+    test("macro_rules! m { ($n:ident) => { struct $n { #[serde(with = \"foo\")] f: () } }; }");
+    // macro invocation
+    test("m! { struct Bar { #[serde(with = \"foo\")] f: () } }");
+    test("m! { struct Bar { #[serde(deserialize_with = \"foo::deserialize\")] f: () } }");
+    test("m! { struct Bar { #[serde(serialize_with = \"foo::serialize\")] f: () } }");
+    test("m! { #[serde(crate = \"foo\")] struct Bar; }");
+    test("m! { #[serde(remote = \"foo\")] struct Bar; }");
+}
+
 #[test]
 fn test_lib() {
     let shear = CargoShear::new(