diff --git a/c/mapping/mlr_dsl_cst_statements.c b/c/mapping/mlr_dsl_cst_statements.c
index 580837200..60fe6996e 100644
--- a/c/mapping/mlr_dsl_cst_statements.c
+++ b/c/mapping/mlr_dsl_cst_statements.c
@@ -448,7 +448,6 @@ mlr_dsl_cst_statement_t* mlr_dsl_cst_statement_valloc(
 	void*                            pvstate)
 {
 	mlr_dsl_cst_statement_t* pstatement = mlr_malloc_or_die(sizeof(mlr_dsl_cst_statement_t));
-	memset(pstatement, 0, sizeof(*pstatement)); // xxx temp
 	pstatement->past_node           = past_node;
 	pstatement->pstatement_handler  = pstatement_handler;
 	pstatement->pblock              = NULL;
@@ -467,7 +466,6 @@ mlr_dsl_cst_statement_t* mlr_dsl_cst_statement_valloc_with_block(
 	void*                            pvstate)
 {
 	mlr_dsl_cst_statement_t* pstatement = mlr_malloc_or_die(sizeof(mlr_dsl_cst_statement_t));
-	memset(pstatement, 0, sizeof(*pstatement)); // xxx temp
 	pstatement->past_node           = past_node;
 	pstatement->pstatement_handler  = pstatement_handler;
 	pstatement->pblock              = pblock;
@@ -666,8 +664,7 @@ sllv_t* allocate_keylist_evaluators_from_ast_node(
 {
 	sllv_t* pkeylist_evaluators = sllv_alloc();
 
-	// xxx comment
-	if (pnode->pchildren != NULL) {
+	if (pnode->pchildren != NULL) { // Non-indexed localvars have no child nodes in the AST.
 		for (sllve_t* pe = pnode->pchildren->phead; pe != NULL; pe = pe->pnext) {
 			mlr_dsl_ast_node_t* pkeynode = pe->pvvalue;
 			if (pkeynode->type == MD_AST_NODE_TYPE_STRING_LITERAL) {