ref: omit capture instead of dropping

src/event.zig

@@ -126,7 +126,7 @@ pub fn isTaggedUnion(comptime T: type) bool {
 /// Determine whether the provided type `T` is a `struct`.
 pub fn isStruct(comptime T: type) bool {
     return switch (@typeInfo(T)) {
-        .@"struct" => |_| true,
+        .@"struct" => true,
         else => false,
     };
 }