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diff --git a/tests/diagnostics/variable-redeclaration.slang b/tests/diagnostics/variable-redeclaration.slang
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+++ b/tests/diagnostics/variable-redeclaration.slang
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+// variable-redeclaration.slang
+
+//DIAGNOSTIC_TEST:SIMPLE:
+
+
+// This test confirms that the compiler produces
+// suitable diagnostics when variables are redeclared
+// in a given scope.
+
+// Global variables, including shader parameters
+
+static int gA;
+
+static Texture2D gA;
+
+// Local variables
+
+int testLocalRedeclaration(int x)
+{
+	int y = x;
+	int y = x;
+}
+
+int testLocalShadowing(int x)
+{
+	int y = x;
+	{
+		// Because this declaration is in an inner
+		// scope it should shadow the existing `y`
+		// rather than conflcit with it.
+		//
+		// TODO: It would be reasonable for the
+		// compiler to warn on this sort of code.
+		//
+		int y = x;
+	}
+}
+
+// Structure fields
+
+struct S
+{
+	int f;
+	float f;
+}
+
+// Function parameter list
+
+int testParameterRedeclaration(
+	int 	size,
+	float 	size)
+{
+	return size;
+}