2 files changed, 2 insertions, 1 deletions
diff --git a/irdump.c b/irdump.c
index d94b9bb..1dd19fb 100644
--- a/irdump.c
+++ b/irdump.c
@@ -247,6 +247,7 @@ irdump(struct function *fn)
    blk = fn->entry;
    do {
       dumpblk(fn, blk);
+      assert(blk->lnext != NULL);
    } while ((blk = blk->lnext) != fn->entry);
    efmt("\n");
 }
diff --git a/lex.h b/lex.h
index 3c1d431..3de4f6e 100644
--- a/lex.h
+++ b/lex.h
@@ -4,7 +4,7 @@ static inline bool
 joinspan(struct span0 *dst, struct span0 snd)
 {
    if (dst->file != snd.file) return 0;
-   assert(dst->off <= snd.off);
+   if (dst->off > snd.off) return 0;
    dst->len = snd.off + snd.len - dst->off;
    return 1;
 }