filter out empty nodes from statement list

+ Fixes tail call analysis that was accidentally broken by
  64146b46da45ce69ab380add00459f7b60fe9196

+ Kind of wasteful to first allocate empty node and then just throw it
  away, but I don't have any better ideas at the moment

1 files changed, 13 insertions, 0 deletions

diff --git a/src/ast.c b/src/ast.c
index a39cb94..d7d97e0 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -567,6 +567,19 @@ struct type *reverse_type_list(struct type *root)
 	return new_root;
 }
 
+struct ast *filter_empty(struct ast *root)
+{
+	struct ast *ret = root;
+	while (root) {
+		if (root->n && root->n->k == AST_EMPTY)
+			root->n = root->n->n;
+
+		root = root->n;
+	}
+
+	return ret;
+}
+
 void fix_closures(struct ast *root)
 {
 	while (root) {