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Sebastian suggested moving the macro guide from Mathlib4 upstream into the Lean 4 manual (called `macro_overview.md` here). There was some discussion about where to put it; the section on metaprogramming seemed like the most appropriate place. I did a little bit of reorganizing to make some items more discoverable (e.g. the user-defined notation section).
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490 B
Markdown
10 lines
490 B
Markdown
# Metaprogramming
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Macros are a language feature that allows writing code that writes other code (metaprogramming).
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In Lean 4, macros are used pervasively. So much so that core language features such as `do` notation
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is implemented via macros! As a language user, macros are useful to easily
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embed domain-specific languages and to generate code at compile-time, to name a few uses.
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## References
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- [Hygenic Macro Expansion for Theorem Proving Languages](https://arxiv.org/abs/2001.10490)
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