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+#! stap -p2
+
+probe kernel.function("sys_open") if (foo(2)) { } # must not call functions
+
+function foo(x) { return x }
+
+# NB: If this condition is relaxed, then this will have to be blocked:
+# global y function foo () { return y++ } # since global y is written-to
+# but this one would be fine:
+# function foo () { return y++ } # since y is written-to