Add Rust target

spec/test_parser_user_code_tree.rs

@@ -0,0 +1,24 @@
+use testparser::*;
+
+fn main() {
+    let mut context = p_context_new(b"ab");
+    assert_eq!(P_SUCCESS, p_parse(&mut context));
+
+    assert_eq!(3, context.start_n_fields);
+    assert_eq!(11, context.start_a_value);
+    assert_eq!(11, context.a_value);
+    assert_eq!(22, context.b_value);
+    assert_eq!(TOKEN_b, context.b_token);
+    assert_eq!(1, context.c_is_null);
+    assert_eq!(1, context.c_field_is_null);
+    assert_eq!(11, context.alias_a_value);
+    assert_eq!(22, context.alias_b_value);
+
+    {
+        let start = p_result(&context);
+        assert!(start.pA().valid());
+        assert!(start.pB().valid());
+        assert!(!start.pC().valid());
+    }
+    p_context_delete(context);
+}