leanprover/reference-manual

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The Lean reference manual

Stars: 129
Forks: 67
Open beginner issues: 0
Indexed issues: 115
Avg merge: 1d 15h
Merged PRs (30d): 16

Dominant language: Lean
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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115 open issues indexed

Document `strong_coinduct` Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

leanprover/reference-manual#937 · Opened Sep 4, 2026
Document `monotonicity_by` Open

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Difficulty 2/5 1-3 hours Newbie friendliness 68/100

leanprover/reference-manual#936 · Opened Sep 4, 2026
Instances are always exposed Open

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Difficulty 2/5 1-3 hours Newbie friendliness 68/100

leanprover/reference-manual#935 · Opened Sep 3, 2026
Inductives don't always split parameters from indices with the colon Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

leanprover/reference-manual#902 · Opened Jul 16, 2026
Declaration modifiers don't mention the public visibility Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

leanprover/reference-manual#896 · Opened Jul 15, 2026
Axioms and Classes disagree on parametricity Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

leanprover/reference-manual#890 · Opened Jul 14, 2026
Document interaction of `namespace` and `open` Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

leanprover/reference-manual#884 · Opened Jul 8, 2026
Suggested build step fails Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

leanprover/reference-manual#880 · 1 comment · 1 reaction · Opened Jun 30, 2026
Invalid link to tests in 12.4.3 Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

leanprover/reference-manual#878 · Opened Jun 28, 2026
Document `#guard` Open

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Difficulty 2/5 1-3 hours Newbie friendliness 68/100

leanprover/reference-manual#853 · Opened May 24, 2026
Minor typo in delaborator section Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

leanprover/reference-manual#828 · Opened Apr 10, 2026
Link from "extended field notation" to "generalized field notation" Open

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Difficulty 1/5 Under an hour Newbie friendliness 78/100

leanprover/reference-manual#815 · Opened Mar 25, 2026
Document `where finally` Open

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Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover/reference-manual#804 · 2 reactions · Opened Mar 13, 2026
Document the effect of `@[expose]`/`@[no_expose]` on each declaration Open

doc-request

Difficulty 3/5 1-2 days Newbie friendliness 52/100

leanprover/reference-manual#771 · 3 reactions · Opened Feb 2, 2026
Minor typo in CH14. mapConst documentation Open

Difficulty 1/5 Under an hour Newbie friendliness 52/100

leanprover/reference-manual#763 · Opened Jan 26, 2026
Traceability of artifacts Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover/reference-manual#748 · 1 reaction · Opened Jan 15, 2026
Document valid `leanOptions` Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

leanprover/reference-manual#743 · Opened Jan 8, 2026
10.4.2: Clarify pipeline syntax Open

doc-request

Difficulty 1/5 1-3 hours Newbie friendliness 48/100

leanprover/reference-manual#719 · Opened Dec 25, 2025
Allow `set_option` documentation Open

doc-request

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover/reference-manual#712 · Opened Dec 17, 2025
Document new wfrec reduction behavior for Nat-valued measures Open

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leanprover/reference-manual#680 · 1 assignee · Opened Dec 2, 2025
Improve description of `grind_pattern` Open

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Difficulty 3/5 1-2 days Newbie friendliness 52/100

leanprover/reference-manual#640 · Opened Oct 28, 2025
@ that makes implicit arguments explicit Open

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Difficulty 2/5 1-3 hours Newbie friendliness 55/100

leanprover/reference-manual#637 · Opened Oct 27, 2025
Consider adding "Error explanation:" to error explanatin section headings. Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

leanprover/reference-manual#635 · Opened Oct 25, 2025
Top-level parts with no chapter number appear as "null" in search Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover/reference-manual#629 · Opened Oct 24, 2025
Add "view hidden" button to examples in HTML Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

leanprover/reference-manual#619 · Opened Oct 20, 2025
Add copy-paste button to example in HTML Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

leanprover/reference-manual#618 · Opened Oct 20, 2025
Example for "inaccessible patterns" is not really helpful? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover/reference-manual#607 · Opened Oct 13, 2025
Unescaped Markdown Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover/reference-manual#605 · Opened Oct 11, 2025
Index of simprocs Open

doc-request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover/reference-manual#604 · Opened Oct 6, 2025
Document new order classes Open

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Difficulty 4/5 3-5 days Newbie friendliness 38/100

leanprover/reference-manual#583 · Opened Sep 10, 2025
one @[grind] should be @[local grind] Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 87/100

leanprover/reference-manual#574 · 1 comment · 1 reaction · Opened Aug 19, 2025
example of implemented_by attribute with opaque declaration Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

leanprover/reference-manual#561 · Opened Aug 7, 2025
Styling: Markdown header levels Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover/reference-manual#542 · 1 comment · Opened Jul 23, 2025
`haveI` has been replaced by `have` Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 50/100

leanprover/reference-manual#534 · Opened Jul 11, 2025
Update constructor representation docs Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover/reference-manual#528 · Opened Jul 4, 2025
Source highlighting and error message validation for module system description Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover/reference-manual#525 · Opened Jul 4, 2025
search: section titles are sometimes buried under API documentation entries Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover/reference-manual#523 · 1 comment · Opened Jul 4, 2025
Simplify build by committing built figures Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover/reference-manual#518 · Opened Jul 2, 2025
Compare `have`, `let`, `haveI`, `letI` Open

doc-request

Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover/reference-manual#472 · Opened Jun 17, 2025
@[defeq] Open

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Difficulty 5/5 Over a week Newbie friendliness 25/100

leanprover/reference-manual#470 · Opened Jun 11, 2025
Additional architectural overview of the lean ecosystem Open

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Difficulty 5/5 Over a week Newbie friendliness 20/100

leanprover/reference-manual#468 · Opened Jun 11, 2025
Document input_file and input_dir in Lake Open

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Difficulty 2/5 1-3 hours Newbie friendliness 55/100

leanprover/reference-manual#467 · Opened Jun 10, 2025
fallback in pattern match Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

leanprover/reference-manual#465 · Opened Jun 9, 2025
`lake exe generate-manual` does not work with `brew` installed `elan` Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover/reference-manual#458 · 1 comment · Opened Jun 2, 2025
Upstream longer examples from attribute docstrings Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

leanprover/reference-manual#449 · Opened May 27, 2025
Add an example for `attribute [{local,scoped} simp] lemma` Open

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Difficulty 2/5 1-3 hours Newbie friendliness 48/100

leanprover/reference-manual#441 · Opened May 19, 2025
Term vs tactic mode `rfl` Open

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Difficulty 3/5 1-2 days Newbie friendliness 45/100

leanprover/reference-manual#439 · Opened May 15, 2025
Thread synchronization overview Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

leanprover/reference-manual#436 · Opened May 12, 2025
Is there a downloadable PDF version of the reference manual? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

leanprover/reference-manual#434 · 10 comments · 2 reactions · Opened May 6, 2025
More Lake library and `needs` docs Open

doc-request

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

leanprover/reference-manual#425 · Opened May 1, 2025

leanprover/reference-manual

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