# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/lin7nea
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認識代數數據類型 ADTs：Rust 枚舉類型很強**
在學習 Rust 之前，我還真不知道代數數據類型（ADTs）這個概念。從 Rust 文檔中大概瞭解它包含 “求和類型” 和“乘積類型”，看似很簡單，但我打算展開學習一下代數數據類型。先看一段很教科書的定義：抽象數據類型（Abstract Data Types，簡稱 ADTs）是計算機科學中的一種概念，用於在不關心數據表示的具體細節的前提下，定義數據的方法。ADTs 常由 “構造” 或“複合”兩種基 ⌘ Read more