Fix bug with path handling (used in assignments).

Closes #67

execute.c

@@ -180,7 +180,8 @@ jv jq_next(jq_state *jq) {
         }
         if (!param) break;
         jv_dump(jv_copy(param->sv.value), 0);
-        printf("<%d>", jv_get_refcnt(param->sv.value));
+        //printf("<%d>", jv_get_refcnt(param->sv.value));
+        printf("<%d>", param->sv.pathidx);
       }
 
       if (backtracking) printf("\t<backtracking>");
@@ -298,7 +299,7 @@ jv jq_next(jq_state *jq) {
       jv_free(path_end.value);
       jv path = jv_array();
       for (int i=path_start.pathidx; i<path_end.pathidx; i++) {
-        path = jv_array_set(path, i, jv_copy(jq->pathbuf[i]));
+        path = jv_array_append(path, jv_copy(jq->pathbuf[i]));
       }
       stack_push(jq, stackval_replace(path_start, path));
       break;

tests/all.test

@@ -574,3 +574,11 @@ unique
 .foo[.baz]
 {"foo":{"bar":4},"baz":"bar"}
 4
+
+.[] | .error = "no, it's OK"
+[{"error":true}]
+{"error": "no, it's OK"}
+
+[{a:1}] | .[] | .a=999
+null
+{"a": 999}