test: update cases to silence 'var is never mutated' errors

test/cases/compile_errors/tuple_init_edge_cases.zig

@@ -1,49 +1,54 @@
 pub export fn entry1() void {
     const T = @TypeOf(.{ 123, 3 });
     var b = T{ .@"1" = 3 };
-    _ = b;
+    _ = &b;
     var c = T{ 123, 3 };
-    _ = c;
+    _ = &c;
     var d = T{};
-    _ = d;
+    _ = &d;
 }
 pub export fn entry2() void {
     var a: u32 = 2;
+    _ = &a;
     const T = @TypeOf(.{ 123, a });
     var b = T{ .@"1" = 3 };
-    _ = b;
+    _ = &b;
     var c = T{ 123, 3 };
-    _ = c;
+    _ = &c;
     var d = T{};
-    _ = d;
+    _ = &d;
 }
 pub export fn entry3() void {
     var a: u32 = 2;
+    _ = &a;
     const T = @TypeOf(.{ 123, a });
     var b = T{ .@"0" = 123 };
-    _ = b;
+    _ = &b;
 }
 comptime {
     var a: u32 = 2;
+    _ = &a;
     const T = @TypeOf(.{ 123, a });
     var b = T{ .@"0" = 123 };
-    _ = b;
+    _ = &b;
     var c = T{ 123, 2 };
-    _ = c;
+    _ = &c;
     var d = T{};
-    _ = d;
+    _ = &d;
 }
 pub export fn entry4() void {
     var a: u32 = 2;
+    _ = &a;
     const T = @TypeOf(.{ 123, a });
     var b = T{ 123, 4, 5 };
-    _ = b;
+    _ = &b;
 }
 pub export fn entry5() void {
     var a: u32 = 2;
+    _ = &a;
     const T = @TypeOf(.{ 123, a });
     var b = T{ .@"0" = 123, .@"2" = 123, .@"1" = 123 };
-    _ = b;
+    _ = &b;
 }
 pub const Consideration = struct {
     curve: Curve,
@@ -64,9 +69,9 @@ pub export fn entry6() void {
 // backend=stage2
 // target=native
 //
-// :17:14: error: missing tuple field with index 1
-// :23:14: error: missing tuple field with index 1
-// :39:14: error: expected at most 2 tuple fields; found 3
-// :45:30: error: index '2' out of bounds of tuple 'struct{comptime comptime_int = 123, u32}'
-// :58:37: error: missing tuple field with index 3
-// :53:32: note: struct declared here
+// :18:14: error: missing tuple field with index 1
+// :25:14: error: missing tuple field with index 1
+// :43:14: error: expected at most 2 tuple fields; found 3
+// :50:30: error: index '2' out of bounds of tuple 'struct{comptime comptime_int = 123, u32}'
+// :63:37: error: missing tuple field with index 3
+// :58:32: note: struct declared here