Update Rust to 1.96

[j178]

No description provided.

[Copilot]

Pull request overview

Updates the repository’s Rust toolchain configuration and workspace MSRV metadata.

Changes:

• Pins rust-toolchain.toml to Rust 1.96.
• Raises the workspace rust-version metadata to 1.94.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
rust-toolchain.toml	Updates the default Rust toolchain channel.
Cargo.toml	Updates the workspace Rust version metadata inherited by crates.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.42%. Comparing base (1815fc5) to head (7dc2a3b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2134      +/-   ##
==========================================
- Coverage   92.42%   92.42%   -0.01%     
==========================================
  Files         121      121              
  Lines       25473    25473              
==========================================
- Hits        23544    23543       -1     
- Misses       1929     1930       +1     

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[prek-ci-bot]

📦 Cargo Bloat Comparison

Binary size change: +0.76% (26.2 MiB → 26.4 MiB)

Expand for cargo-bloat output

Head Branch Results

 File  .text     Size             Crate Name
 1.2%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_encrypt_avx512
 1.2%   2.5% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_decrypt_avx512
 0.3%   0.7%  90.0KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.7%  85.1KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.5%  69.8KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  60.7KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  49.4KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.4%  48.3KiB              prek prek::run::{{closure}}
 0.2%   0.3%  42.7KiB              prek prek::cli::run::run::run::{{closure}}
 0.1%   0.3%  33.1KiB             prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  30.6KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::Config>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  30.1KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  28.1KiB      serde_saphyr granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.0KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  25.1KiB              prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2%  23.0KiB      serde_saphyr granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  21.5KiB      clap_builder clap_builder::parser::parser::Parser::get_matches_with
41.9%  86.4%  11.0MiB                   And 24102 smaller methods. Use -n N to show more.
48.4% 100.0%  12.8MiB                   .text section size, the file size is 26.4MiB

Base Branch Results

 File  .text     Size             Crate Name
 1.2%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_encrypt_avx512
 1.2%   2.6% 332.0KiB        aws_lc_sys aws_lc_0_41_0_aes_gcm_decrypt_avx512
 0.3%   0.7%  90.4KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.6%  81.5KiB              prek prek::languages::<impl prek::config::Language>::run::{{closure}}::{{closure}}
 0.3%   0.5%  69.9KiB              prek prek::languages::<impl prek::config::Language>::install::{{closure}}
 0.2%   0.5%  60.9KiB             prek? <prek::cli::Command as clap_builder::derive::Subcommand>::augment_subcommands
 0.2%   0.4%  51.3KiB annotate_snippets annotate_snippets::renderer::render::render
 0.2%   0.3%  43.0KiB              prek prek::cli::run::run::run::{{closure}}
 0.1%   0.3%  35.9KiB              prek prek::run::{{closure}}
 0.1%   0.3%  33.1KiB             prek? <prek::cli::RunArgs as clap_builder::derive::Args>::augment_args
 0.1%   0.2%  30.4KiB             prek? <prek::config::_::<impl serde_core::de::Deserialize for prek::config::Config>::deserialize::__Visitor as serde_core::de::Visitor>::visit_map
 0.1%   0.2%  29.6KiB               std core::ptr::drop_in_place<prek::languages::<impl prek::config::Language>::install::{{closure}}>
 0.1%   0.2%  28.1KiB      serde_saphyr granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  28.0KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble_alt
 0.1%   0.2%  27.5KiB        aws_lc_sys aws_lc_0_41_0_edwards25519_scalarmuldouble
 0.1%   0.2%  26.4KiB              prek prek::cli::try_repo::try_repo::{{closure}}
 0.1%   0.2%  23.9KiB              prek prek::hooks::meta_hooks::MetaHooks::run::{{closure}}
 0.1%   0.2%  23.0KiB      serde_saphyr granit_parser::scanner::Scanner<T>::fetch_more_tokens
 0.1%   0.2%  22.3KiB         [Unknown] Lp384_montjscalarmul_alt_p384_montjadd
 0.1%   0.2%  21.5KiB      clap_builder clap_builder::parser::parser::Parser::get_matches_with
41.6%  86.4%  10.9MiB                   And 24017 smaller methods. Use -n N to show more.
48.1% 100.0%  12.6MiB                   .text section size, the file size is 26.2MiB

[prek-ci-bot]

⚡️ Hyperfine Benchmarks

Summary: 2 regressions, 1 improvements above the 10% threshold.

Environment

• OS: Linux 6.17.0-1015-azure
• CPU: 4 cores
• prek version: prek 0.4.3+3 (6045bec 2026-05-29)
• Rust version: rustc 1.96.0 (ac68faa20 2026-05-25)
• Hyperfine version: hyperfine 1.20.0

CLI Commands

Benchmarking basic commands in the main repo:

prek --version

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base --version	2.3 ± 0.1	2.2	2.8	1.00
prek-head --version	2.4 ± 0.1	2.2	2.9	1.01 ± 0.06

prek list

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base list	9.1 ± 0.1	8.8	9.8	1.00
prek-head list	9.5 ± 1.1	8.9	16.5	1.04 ± 0.12

prek validate-config .pre-commit-config.yaml

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base validate-config .pre-commit-config.yaml	3.2 ± 0.0	3.1	3.3	1.00 ± 0.03
prek-head validate-config .pre-commit-config.yaml	3.2 ± 0.1	3.0	3.6	1.00

prek sample-config

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base sample-config	2.6 ± 0.0	2.5	2.7	1.00
prek-head sample-config	2.7 ± 0.1	2.5	2.9	1.02 ± 0.03

Cold vs Warm Runs

Comparing first run (cold) vs subsequent runs (warm cache):

prek run --all-files (cold - no cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	86.5 ± 3.9	79.8	90.7	1.00
prek-head run --all-files	87.1 ± 4.1	79.6	92.1	1.01 ± 0.07

prek run --all-files (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	84.5 ± 5.0	74.5	93.4	1.00
prek-head run --all-files	85.2 ± 4.9	74.6	95.9	1.01 ± 0.08

Full Hook Suite

Running the builtin hook suite on the benchmark workspace:

prek run --all-files (full builtin hook suite)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --all-files	86.9 ± 4.2	76.8	97.9	1.00 ± 0.07
prek-head run --all-files	86.5 ± 4.6	76.5	97.9	1.00

Individual Hook Performance

Benchmarking each hook individually on the test repo:

prek run trailing-whitespace --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run trailing-whitespace --all-files	22.1 ± 1.3	20.6	25.4	1.02 ± 0.10
prek-head run trailing-whitespace --all-files	21.6 ± 1.8	19.8	28.9	1.00

prek run end-of-file-fixer --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run end-of-file-fixer --all-files	28.9 ± 2.3	24.8	33.3	1.00
prek-head run end-of-file-fixer --all-files	28.9 ± 3.1	24.3	36.0	1.00 ± 0.13

prek run check-json --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-json --all-files	8.3 ± 0.4	7.7	9.5	1.00
prek-head run check-json --all-files	8.3 ± 0.4	7.7	9.7	1.00 ± 0.07

prek run check-yaml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-yaml --all-files	8.1 ± 0.3	7.6	8.8	1.00 ± 0.06
prek-head run check-yaml --all-files	8.1 ± 0.4	7.6	9.2	1.00

prek run check-toml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-toml --all-files	8.4 ± 0.4	7.6	9.3	1.00
prek-head run check-toml --all-files	8.5 ± 0.5	7.7	9.8	1.01 ± 0.08

prek run check-xml --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-xml --all-files	8.3 ± 0.3	7.7	8.9	1.00 ± 0.06
prek-head run check-xml --all-files	8.3 ± 0.3	7.7	9.1	1.00

prek run detect-private-key --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run detect-private-key --all-files	15.7 ± 2.0	13.0	19.7	1.04 ± 0.16
prek-head run detect-private-key --all-files	15.1 ± 1.3	12.5	18.1	1.00

prek run fix-byte-order-marker --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run fix-byte-order-marker --all-files	23.9 ± 1.8	20.7	27.1	1.00
prek-head run fix-byte-order-marker --all-files	29.7 ± 18.0	19.9	103.0	1.24 ± 0.76

⚠️ Warning: Performance regression for prek run fix-byte-order-marker --all-files: 24.3300% slower

Installation Performance

Benchmarking hook installation (fast path hooks skip Python setup):

prek install-hooks (cold - no cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.7 ± 0.1	4.6	4.8	1.00 ± 0.02
prek-head install-hooks	4.7 ± 0.1	4.6	4.8	1.00

prek install-hooks (warm - with cache)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base install-hooks	4.6 ± 0.1	4.6	4.7	1.00
prek-head install-hooks	4.7 ± 0.1	4.7	4.9	1.02 ± 0.02

File Filtering/Scoping Performance

Testing different file selection modes:

prek run (staged files only)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run	41.6 ± 2.0	39.4	48.0	1.01 ± 0.05
prek-head run	41.4 ± 1.0	39.9	43.2	1.00

prek run --files '*.json' (specific file type)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --files '*.json'	8.4 ± 0.1	8.3	8.7	1.00
prek-head run --files '*.json'	9.5 ± 2.3	8.4	17.9	1.13 ± 0.27

⚠️ Warning: Performance regression for prek run --files '*.json' (specific file type): 12.6000% slower

Workspace Discovery & Initialization

Benchmarking hook discovery and initialization overhead:

prek run --dry-run --all-files (measures init overhead)

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run --dry-run --all-files	7.3 ± 0.2	7.1	8.1	1.02 ± 0.03
prek-head run --dry-run --all-files	7.2 ± 0.1	7.0	7.4	1.00

Meta Hooks Performance

Benchmarking meta hooks separately:

prek run check-hooks-apply --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-hooks-apply --all-files	13.0 ± 0.2	12.7	13.5	1.15 ± 0.02
prek-head run check-hooks-apply --all-files	11.3 ± 0.1	11.2	11.6	1.00

✅ Performance improvement for prek run check-hooks-apply --all-files: 12.7600% faster

prek run check-useless-excludes --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run check-useless-excludes --all-files	11.2 ± 0.1	11.1	11.4	1.00
prek-head run check-useless-excludes --all-files	11.2 ± 0.1	11.1	11.4	1.00 ± 0.01

prek run identity --all-files

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
prek-base run identity --all-files	10.6 ± 0.1	10.5	10.8	1.00
prek-head run identity --all-files	10.7 ± 0.2	10.3	11.3	1.01 ± 0.02