# 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/knuyh3a
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也來聊聊 Rust 的內部可變性**
“內部可變性”的概念講起來很有迷惑性，理論知識可能很容易將新手繞暈。先來通俗說一下它的用途。其實這東西的產生，是因爲 Rust 的規矩太多，有着嚴格的內存訪問限制。內部可變性是一種變通手段，將 “破例” 的行爲仍然約束在 Rust 可控的範圍。就是說，你想破例也要按我的規則來破例。我們都知道，Rust 的內存安全基於以下規則：給定對象 T，只能有以下情況之一：對該對象有多個不可變引用（&T）（也稱 ⌘ Read more