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feat: pp.mdata#12606

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kmill merged 1 commit intoleanprover:masterfrom
kmill:kmill_pp_mdata
Feb 24, 2026
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feat: pp.mdata#12606
kmill merged 1 commit intoleanprover:masterfrom
kmill:kmill_pp_mdata

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@kmill kmill commented Feb 20, 2026 •
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This PR adds the pretty printer option pp.mdata, which causes the pretty printer to annotate terms with any metadata that is present. For example,

set_option pp.mdata true
/-- info: [mdata noindex:true] 2 : Nat -/
#guard_msgs in #check no_index 2

The [mdata ...] e syntax is only for pretty printing.

Thanks to @Rob23oba for an initial version.

Closes #10929

@kmill
feat: pp.mdata
2a659f4 
This PR adds the pretty printer option `pp.mdata`, which causes the pretty printer to annotate terms with any metadata that is present. For example,
```lean
/-- info: [mdata noindex:true] 2 : Nat -/
#guard_msgs in #check no_index 2
```
The `[mdata ...] e` syntax is only for pretty printing.
@kmill kmill added the changelog-pp Pretty printing label Feb 20, 2026
@kmill kmill requested a review from nomeata February 20, 2026 10:28
@github-actions github-actions bot added the toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN label Feb 20, 2026
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leanprover-bot commented Feb 20, 2026

Reference manual CI status:

  • ❗ Reference manual CI can not be attempted yet, as the nightly-testing-2026-02-19 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-manual, reference manual CI should run now. You can force reference manual CI using the force-manual-ci label. (2026-02-20 11:35:21)

mathlib-nightly-testing bot pushed a commit to leanprover-community/batteries that referenced this pull request Feb 20, 2026
Update lean-toolchain for testing leanprover/lean4#12606
d536345
@github-actions github-actions bot added the mathlib4-nightly-available A branch for this PR exists at leanprover-community/mathlib4-nightly-testing:lean-pr-testing-NNNN label Feb 20, 2026
mathlib-nightly-testing bot pushed a commit to leanprover-community/mathlib4-nightly-testing that referenced this pull request Feb 20, 2026
Update lean-toolchain for testing leanprover/lean4#12606
112b082
nomeata
nomeata approved these changes Feb 20, 2026
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Not an expert on delaboration, but first glance looks good, especially form a user POV.

@mathlib-lean-pr-testing mathlib-lean-pr-testing bot added the builds-mathlib CI has verified that Mathlib builds against this PR label Feb 20, 2026
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mathlib-lean-pr-testing bot commented Feb 20, 2026

Mathlib CI status (docs):

@kmill kmill added this pull request to the merge queue Feb 24, 2026
Merged via the queue into leanprover:master with commit cd7f55b Feb 24, 2026
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builds-mathlib CI has verified that Mathlib builds against this PR changelog-pp Pretty printing mathlib4-nightly-available A branch for this PR exists at leanprover-community/mathlib4-nightly-testing:lean-pr-testing-NNNN toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN

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RFC: pp.mdata

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