BR3392200: preproc - Fix dangling paste term

Backport 99a055add917fe954038885d9013f8968f76790c

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/preproc.c b/preproc.c
index 0dab8f28..ac39bb1b 100644
--- a/preproc.c
+++ b/preproc.c
@@ -3678,8 +3678,13 @@ static bool paste_tokens(Token **head, const struct tokseq_match *m,
                 while (t && (t->type == TOK_WHITESPACE ||
                              t->type == TOK_PASTE))
                     t = *tail = delete_Token(t);
-                if (!paste_head || !t)
-                    break;      /* Nothing to paste with */
+                if (!t) { /* Dangling %+ term */
+                    if (paste_head)
+                        (*paste_head)->next = NULL;
+                    else
+                        *head = NULL;
+                    return did_paste;
+                }
                 tail = paste_head;
                 t = *tail;
                 tt = t->next;