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transmutability: Support types with restricted validity ranges

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open (in progress).

rust-lang/rustnumber 148449

#148449 In rust-lang/rust;

· joshlf opened on Nov 3, 2025

Document MaybeUninit bit validity

disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.

finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

S-waiting-on-t-langStatus: Awaiting decision from T-langStatus: Awaiting decision from T-lang

S-waiting-on-t-opsemStatus: Awaiting decision from T-opsemStatus: Awaiting decision from T-opsem

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

to-announceAnnounce this issue on triage meetingAnnounce this issue on triage meeting

Status: Merged (completed).

rust-lang/rustnumber 140463

#140463 In rust-lang/rust;

· by joshlf was closed on Oct 23, 2025

· 

1.92.0

transmutability: Support char, NonZeroXxx

A-compiletestArea: The compiletest test runnerArea: The compiletest test runner

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Merged (completed).

rust-lang/rustnumber 140215

#140215 In rust-lang/rust;

· by joshlf was closed on Apr 26, 2025

· 

1.88.0

transmute: Mark edges by byte sets, not byte values

merged-by-borsThis PR was explicitly merged by bors.This PR was explicitly merged by bors.

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Merged (completed).

rust-lang/rustnumber 140168

#140168 In rust-lang/rust;

· by joshlf was closed on Apr 24, 2025

· 

1.88.0

transmutability: Short-circuit NFA->DFA

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Closed (abandoned).

rust-lang/rustnumber 139937

#139937 In rust-lang/rust;

· by joshlf was closed on Apr 21, 2025

transmutability: Refactor tests for simplicity

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Merged (completed).

rust-lang/rustnumber 139932

#139932 In rust-lang/rust;

· by joshlf was closed on Apr 17, 2025

· 

1.88.0

Guarantee behavior of transmuting <code>Option::&lt;T&gt;::None</code> subject to NPO

disposition-mergeThis issue / PR is in PFCP or FCP with a disposition to merge it.This issue / PR is in PFCP or FCP with a disposition to merge it.

finished-final-comment-periodThe final comment period is finished for this PR / Issue.The final comment period is finished for this PR / Issue.

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

needs-fcpThis change is insta-stable, or significant enough to need a team FCP to proceed.This change is insta-stable, or significant enough to need a team FCP to proceed.

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-langRelevant to the language teamRelevant to the language team

Status: Merged (completed).

rust-lang/rustnumber 137323

#137323 In rust-lang/rust;

· by joshlf was closed on May 24, 2025

· 

1.89.0

[NonNull] Document behavior of From&lt;&amp;[mut] T&gt; wrt provenance

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Closed (abandoned).

rust-lang/rustnumber 130571

#130571 In rust-lang/rust;

· by joshlf was closed on Feb 15, 2025

Update reference safety requirements

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Merged (completed).

rust-lang/rustnumber 125021

#125021 In rust-lang/rust;

· by joshlf was closed on May 12, 2024

· 

1.80.0

Clarify atomic bit validity

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Merged (completed).

rust-lang/rustnumber 121943

#121943 In rust-lang/rust;

· by joshlf was closed on Mar 28, 2024

· 

1.79.0

MaybeUninit: Document UnsafeCell byte ranges

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Closed (abandoned).

rust-lang/rustnumber 121215

#121215 In rust-lang/rust;

· by joshlf was closed on Nov 18, 2024

Expand mem::offset_of! docs

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Merged (completed).

rust-lang/rustnumber 117512

#117512 In rust-lang/rust;

· by joshlf was closed on Nov 2, 2023

· 

1.75.0