Add Rust target

spec/test_optional_rule_component_tree.rs

@@ -0,0 +1,40 @@
+use testparser::*;
+
+fn main() {
+    let mut context = p_context_new(b"b");
+    assert_eq!(P_SUCCESS, p_parse(&mut context));
+    {
+        let start = p_result(&context);
+        assert!(!start.pToken1().valid());
+        assert!(start.pToken2().valid());
+        assert_eq!(TOKEN_b, start.pToken2().token());
+        assert!(!start.pR3().valid());
+        assert!(!start.pR().valid());
+    }
+    p_context_delete(context);
+
+    let mut context = p_context_new(b"abcd");
+    assert_eq!(P_SUCCESS, p_parse(&mut context));
+    {
+        let start = p_result(&context);
+        assert!(start.pToken1().valid());
+        assert_eq!(TOKEN_a, start.pToken1().token());
+        assert!(start.pToken2().valid());
+        assert!(start.pR3().valid());
+        assert!(start.pR().valid());
+        assert_eq!(start.pR().node_id(), start.pR3().node_id());
+        assert_eq!(TOKEN_c, start.pR().pToken1().token());
+    }
+    p_context_delete(context);
+
+    let mut context = p_context_new(b"bdc");
+    assert_eq!(P_SUCCESS, p_parse(&mut context));
+    {
+        let start = p_result(&context);
+        assert!(!start.pToken1().valid());
+        assert!(start.pToken2().valid());
+        assert!(start.pR().valid());
+        assert_eq!(TOKEN_d, start.pR().pToken1().token());
+    }
+    p_context_delete(context);
+}