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Vars have no subexpressions.

--- a/parse/infer.c

+++ b/parse/infer.c

@@ -1378,6 +1378,9 @@

 	size_t i, nargs;

 	int isconst;

+	/* Ovar has no subexpressions */

+	if (exprop(n) == Ovar)

+		return;

 	args = n->expr.args;

 	nargs = n->expr.nargs;

 	isconst = 1;