chore: reduce import all

[felixpernegger]

Removes import all whenever possible. I also tried to "downgrade" by changing to import from import all, but that never made a difference. Excludes MathlibTest.

For a related PR, see #41222.

---

[github-actions]

PR summary 65dd51a2d1

Import changes for modified files

Dependency changes

File	Base Count	Head Count	Change
Mathlib.Lean.Meta.RefinedDiscrTree.Encode	59	58	-1 (-1.69%)
Mathlib.Tactic.GCongr.Core	77	76	-1 (-1.30%)
Mathlib.Data.Int.Bitwise	397	394	-3 (-0.76%)
Mathlib.Control.Monad.Cont	134	133	-1 (-0.75%)
Mathlib.Data.Fintype.Parity	458	455	-3 (-0.66%)
Mathlib.Tactic.PNatToNat	483	480	-3 (-0.62%)

Import changes for all files

Files	Import difference
../mathlib-ci/scripts/pr_summary/import_trans_difference.sh all
There are 7667 files with changed transitive imports taking up over 340132 characters: this is too many to display!
You can run this locally from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

---

Declarations diff (regex)

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## from your `mathlib4` directory:
git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

## summary with just the declaration names:
../mathlib-ci/scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
../mathlib-ci/scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh in the mathlib-ci repository contains some details about this script.

Declarations diff (Lean)

✅ Lean-aware diff — post-build, computed from the Lean environment (commit 65dd51a).

• +0 new declarations
• −0 removed declarations

No declaration differences.

---

No changes to strong technical debt.

No changes to weak technical debt.

Current commit 65dd51a2d1
Reference commit 2051676240

This script lives in the mathlib-ci repository. To run it locally, from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci
../mathlib-ci/scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[felixpernegger]

!bench

[leanprover-radar]

Benchmark results for 65dd51a against 2051676 are in. No significant results found. @felixpernegger

• 🟥 build//instructions: +66.3G (+0.04%)

Small changes (1✅)

• ✅ build/module/Mathlib.Tactic.GCongr.Core//instructions: -889.3M (-3.86%)

[grunweg]

!bench

[leanprover-radar]

Benchmark results for 65dd51a against 2051676 are in. (These commits have already been benchmarked in a previous command.) No significant results found. @grunweg

• 🟥 build//instructions: +66.3G (+0.04%)

Small changes (1✅)

• ✅ build/module/Mathlib.Tactic.GCongr.Core//instructions: -889.3M (-3.86%)

[grunweg]

Hm, I'm not sure what to make of the instruction increases. They are not large, but so is the benefit of this PR.