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Question about value/reference semantic and closure capture

3

## Value/reference semantic ``` 吾有一列。名之曰「甲」。 有列「甲」。名之曰「乙」。 充「乙」以一。 噫。夫「甲」。書之。 噫。夫「乙」。書之。 ``` Should the code above print [] [1] or [1] [1]? ``` 吾有一列。名之曰「空列」。 吾有一物。名之曰「甲」。其物如是。 物之「「數」」者。數曰一。 物之「「列」」者。列曰「空列」。 是謂「甲」之物也。 有物「甲」。名之曰「乙」。 昔之「乙」之「「數」」者。今二是矣。 夫「乙」之「「列」」。充其以三。 噫。夫「甲」之「「數」」。夫「甲」之「「列」」。書之。...

Uncaught (in promise) TypeError: Cannot read property 'replace' of undefined at filterXss ([app.js:327](https://github.com/takayama-lily/vscode-qq/blob/7d7b69c83aa96703c6a9b319cb0382b2cd65d2af/assets/default-theme/app.js#L327)) at parseMessage ([app.js:399](https://github.com/takayama-lily/vscode-qq/blob/7d7b69c83aa96703c6a9b319cb0382b2cd65d2af/assets/default-theme/app.js#L399)) at genUserMessage ([app.js:309](https://github.com/takayama-lily/vscode-qq/blob/7d7b69c83aa96703c6a9b319cb0382b2cd65d2af/assets/default-theme/app.js#L309)) at [app.js:70](https://github.com/takayama-lily/vscode-qq/blob/7d7b69c83aa96703c6a9b319cb0382b2cd65d2af/assets/default-theme/app.js#L70)

`<random>`: `normal_distribution` is slower than Boost

2

**Describe the bug** A benchmark by Alexander Neumann (original issue reporter) showed that `std::normal_distribution` with `std::mt19937_64` was 4 times slower than `boost::normal_distribution` with `std::mt19937_64`. **Additional context** Part of the performance...