Enhance UTs related to lightScope and labels (libmir#479)

* Enhance UTs related to lightScope and labels

* Replace tabs with spaces

Author: jmh530

source/mir/ndslice/slice.d

@@ -4163,14 +4163,33 @@ version(mir_ndslice_test)
 unittest
 {
     import mir.ndslice.slice: LightImmutableOfLightConstOf, Slice, Contiguous;
-	import std.meta: staticMap;
-	// Make `x` immutable with label to ensure trigger of staticMap with immutable lightScope overload
-	alias T = Slice!(int*, 2, Contiguous, int*);
-	immutable T x = T.init;
-	// For compilation of immutable lightScope overload with auto return type inference
-	alias R = typeof(x.lightScope);
-	// Ensure `R` is a Slice
-	static assert(is(T : Slice!(Iterator, 2, Contiguous), Iterator));
-	// Ensure staticMap working properly
-	static assert(is(R.Labels[0] == staticMap!(LightImmutableOfLightConstOf, int*)[0]));
+    import std.meta: staticMap;
+    // Make `x` immutable with label to ensure trigger of staticMap with immutable lightScope overload
+    alias T = Slice!(int*, 2, Contiguous, int*);
+    immutable T x = T.init;
+    // For compilation of immutable lightScope overload with auto return type inference
+    alias R = typeof(x.lightScope);
+    // Ensure `R` is a Slice
+    static assert(is(R : Slice!(Iterator, 2, Contiguous), Iterator));
+    // Ensure staticMap working properly
+    static assert(is(R.Labels[0] == staticMap!(LightImmutableOfLightConstOf, int*)[0]));
+}
+
+// Additional test for fix on issue #470
+@safe pure nothrow @nogc
+version(mir_ndslice_test)
+unittest
+{
+    import mir.ndslice.slice: LightImmutableOfLightConstOf, Slice, Contiguous;
+    import std.meta: staticMap;
+    // Make `x` immutable with label to ensure trigger of staticMap with immutable lightScope overload
+    alias T = Slice!(int*, 2, Contiguous, int*, long*);
+    immutable T x = T.init;
+    // For compilation of immutable lightScope overload with auto return type inference
+    alias R = typeof(x.lightScope);
+    // Ensure `R` is a Slice
+    static assert(is(R : Slice!(Iterator, 2, Contiguous), Iterator));
+    // Ensure staticMap working properly
+    static assert(is(R.Labels[0] == staticMap!(LightImmutableOfLightConstOf, int*, long*)[0]));
+    static assert(is(R.Labels[1] == staticMap!(LightImmutableOfLightConstOf, int*, long*)[1]));
 }