std.meta.TrailerFlags: include in std tests

Previously, TrailerFlags was unreferenced in std,
so its tests were never run.

Also, fix the use of `default_value` whose type was changed in
f4a249325e8e3741a6294462ae37a79cb9089c56 (#10766).

2 files changed, 5 insertions, 4 deletions

diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index e6ce746f19..0de51bfa68 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -10,6 +10,10 @@ pub const TrailerFlags = @import("meta/trailer_flags.zig").TrailerFlags;
 
 const Type = std.builtin.Type;
 
+test "std.meta.TrailerFlags" {
+    _ = TrailerFlags;
+}
+
 pub fn tagName(v: anytype) []const u8 {
     const T = @TypeOf(v);
     switch (@typeInfo(T)) {
diff --git a/lib/std/meta/trailer_flags.zig b/lib/std/meta/trailer_flags.zig
index a128564708..e4288692b1 100644
--- a/lib/std/meta/trailer_flags.zig
+++ b/lib/std/meta/trailer_flags.zig
@@ -24,10 +24,7 @@ pub fn TrailerFlags(comptime Fields: type) type {
                 fields[i] = Type.StructField{
                     .name = struct_field.name,
                     .field_type = ?struct_field.field_type,
-                    .default_value = @as(
-                        ??struct_field.field_type,
-                        @as(?struct_field.field_type, null),
-                    ),
+                    .default_value = &@as(?struct_field.field_type, null),
                     .is_comptime = false,
                     .alignment = @alignOf(?struct_field.field_type),
                 };