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-rw-r--r--src/cmd/6g/gobj.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/cmd/6g/gobj.c b/src/cmd/6g/gobj.c
index 1d7c07eba..6199d2f2f 100644
--- a/src/cmd/6g/gobj.c
+++ b/src/cmd/6g/gobj.c
@@ -97,6 +97,8 @@ zaddr(Biobuf *b, Addr *a, int s)
switch(a->type) {
case D_BRANCH:
+ if(a->branch == nil)
+ fatal("unpatched branch");
a->offset = a->branch->loc;
default: