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tests/cc: Add test 0186-dec-ary.c

This test is added to verify correctness of post operators
with operands containing side effects.

--- /dev/null

+++ b/tests/cc/execute/0186-dec-ary.c

@@ -1,0 +1,23 @@

+struct node {

+	int index;

+};

+

+struct node nodes[2];

+

+int

+main(void)

+{

+	int d = 1, c;

+

+	d = 1;

+	c = nodes[--d].index++;

+	if (d != 0 || nodes[0].index != 1)

+		return 1;

+

+	d = -1;

+	c = nodes[++d].index--;

+	if (d != 0 || nodes[0].index != 0)

+		return 2;

+

+	return 0;

+}

--- a/tests/cc/execute/scc-tests.lst

+++ b/tests/cc/execute/scc-tests.lst

@@ -176,3 +176,4 @@

 0183-negenum.c

 0184-esc-macro.c

 0185-esc-macro2.c

+0186-dec-ary.c