Why did Rust require macro names to have an exclamation point at the end?

Why did Rust require macro names to have an exclamation point at the end?
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Why did the designers of the Rust programming language require that macro names have to end with an exclamation point? I observe that both Common Lisp and Emacs Lisp language variants do not appear...

langdev.stackexchange.com 2 years ago

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https://langdev.stackexchange.com/questions/3071/why-did-rust-require-macro-names-to-have-an-exclamation-point-at-the-end