Prefixed

    pub const Prefixed = struct {
        sync_scope: SyncScope,
        prefix: []const u8,

        pub fn format(p: Prefixed, w: *Writer) Writer.Error!void {
            switch (p.sync_scope) {
                .system => return,
                .singlethread => {
                    var vecs: [2][]const u8 = .{ p.prefix, "syncscope(\"singlethread\")" };
                    return w.writeVecAll(&vecs);
                },
            }
        }
    }