knownbug: precedence of ACSL quantifiers

The ACSL quantifiers bind very weakly -- the current grammar assumes a very
strong binding.

Author: Daniel Kroening

regression/cbmc/ACSL/quantifier-precedence.c

@@ -0,0 +1,6 @@
+int main()
+{
+  // ∀ binds very weakly.
+  // In particular, 'i' below is in the scope of the quantifier.
+  __CPROVER_assert(∀ int i; 1 ? 1 : i, "∀ binds weakly");
+}

regression/cbmc/ACSL/quantifier-precedence.desc

@@ -0,0 +1,8 @@
+KNOWNBUG
+quantifier-precedence.c
+
+^EXIT=0$
+^SIGNAL=0$
+^VERIFICATION SUCCESSFUL$
+--
+^warning: ignoring