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https://leanprover-community.github.io/mathlib_docs/tactic/delta_instance.html#tactic.delta_instance_handler
In lean3 there was a default derive handler which would run `delta` on the goal. That is, …
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## Option
At this point in the text, reading linearly, universes have not yet been introduced and I could not figure out what this syntax meant (the `: Type`) and what its purpose is.
```
induc…
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### Description
Use the following MWE and trigger Go to Definition at ``:
```
#eval 1
```
This yields an error:
```
[Error - 11:37:43 AM] Request textDocument/definition failed.
Messag…
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It would be good to forward-port the features from:
* [x] https://github.com/leanprover-community/doc-gen/pull/172
Instance lists for builtin types, like we already have for inductive types
* [ ]…
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Compare:
* Lean 4: [`exists_eq`](https://leanprover-community.github.io/mathlib4_docs/Std/Logic.html#exists_eq)
* Lean 3: [`exists_eq`](https://leanprover-community.github.io/mathlib_docs/find/exist…
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Lean 4 has a great VS Code integration. Is it possible to include its syntax highlighting in this plugin?
https://marketplace.visualstudio.com/items?itemName=leanprover.lean4
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Mathlib uses this idiom many times:
```lean
@[class] def ...
```
In Lean4, only structures can be classes. The porting tool ignores such class annotations. Ideally, Mathlib backports this restrict…
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### Description
When a docstring contains something that could be HTML but isn't, the rest of the file is highlighted as if it were part of the docstring. This leads to incorrect fonts.
Here's a…
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***OpenAI Sora is good but not enough, we still need GS/SuGaR/4D-Mesh/... !***
***OpenAI Sora*** has caused quite a sensation, really very good, but I ***Firmly Believe*** that achieving physically…
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It would be very useful if `elan toolchain list` also reported the path that a "linked" toolchain is pointing to. For example, today I get this output:
```
stable (default)
leanprover/lean:stable
…