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-rw-r--r--Build/source/texk/web2c/mplibdir/mp.w2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/texk/web2c/mplibdir/mp.w b/Build/source/texk/web2c/mplibdir/mp.w
index 099004e36c0..1c707957ced 100644
--- a/Build/source/texk/web2c/mplibdir/mp.w
+++ b/Build/source/texk/web2c/mplibdir/mp.w
@@ -21169,7 +21169,7 @@ void mp_begin_iteration (MP mp) {
p->value_mod = mp_suffix_sym;
}
mp_get_x_next (mp);
- if (cur_cmd() == mp_within_token) {
+ if (p->value_mod = mp_expr_sym && cur_cmd() == mp_within_token) {
@<Set up a picture iteration@>;
} else {
@<Check for the assignment in a loop header@>;