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Constify Index traits #143921

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@oli-obk oli-obk commented Jul 14, 2025 •
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tracking issue: #143775

the SliceIndex trait cannot be implemented by users as it is sealed. While it would be useful for the get method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? @fee1-dead

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Jul 14, 2025
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fee1-dead approved these changes Jul 14, 2025
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really nice. I'm happy that this was done without any change to the actual logic :D

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@bors r+ rollup

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bors commented Jul 14, 2025

📌 Commit 8b350d5 has been approved by fee1-dead

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 14, 2025
Kobzol added a commit to Kobzol/rust that referenced this pull request Jul 14, 2025
@Kobzol
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
87260a5 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? `@fee1-dead`
@Kobzol Kobzol mentioned this pull request Jul 14, 2025
Closed
Kobzol added a commit to Kobzol/rust that referenced this pull request Jul 14, 2025
@Kobzol
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
af80daa 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? ``@fee1-dead``
@Kobzol Kobzol mentioned this pull request Jul 14, 2025
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Failed in rollup: #143947 (comment)

error[E0658]: cannot call conditionally-const method `core::slice::<impl [()]>::get_unchecked::<std::ops::Range<usize>>` in constants
##[error]  --> /checkout/tests/ui/consts/const-eval/ub-slice-get-unchecked.rs:7:29
   |
LL | const B: &[()] = unsafe { A.get_unchecked(3..1) };

@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Jul 15, 2025
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oli-obk commented Jul 15, 2025

@bors r=fee1-dead

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bors commented Jul 15, 2025

📌 Commit 2b4ede7 has been approved by fee1-dead

It is now in the queue for this repository.

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bors commented Jul 15, 2025

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 15, 2025
samueltardieu added a commit to samueltardieu/rust that referenced this pull request Jul 15, 2025
@samueltardieu
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
793e9e6 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? `@fee1-dead`
@samueltardieu samueltardieu mentioned this pull request Jul 15, 2025
Closed
samueltardieu added a commit to samueltardieu/rust that referenced this pull request Jul 15, 2025
@samueltardieu
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
544d80e 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? ``@fee1-dead``
@samueltardieu samueltardieu mentioned this pull request Jul 15, 2025
Closed
samueltardieu added a commit to samueltardieu/rust that referenced this pull request Jul 15, 2025
@samueltardieu
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
0504415 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? ```@fee1-dead```
@samueltardieu samueltardieu mentioned this pull request Jul 15, 2025
Closed
samueltardieu added a commit to samueltardieu/rust that referenced this pull request Jul 15, 2025
@samueltardieu
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
fc55ea6 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? ````@fee1-dead````
@samueltardieu samueltardieu mentioned this pull request Jul 15, 2025
Closed
samueltardieu added a commit to samueltardieu/rust that referenced this pull request Jul 15, 2025
@samueltardieu
Rollup merge of rust-lang#143921 - oli-obk:const-index, r=fee1-dead
972bd00 
Constify `Index` traits

tracking issue: rust-lang#143775

the `SliceIndex` trait cannot be implemented by users as it is sealed. While it would be useful for the `get` method on slices, it seems weird to have a feature gate for that that isn't also gating index syntax at the same time, so I put them under the same feature gate.

r? `````@fee1-dead`````
@samueltardieu samueltardieu mentioned this pull request Jul 15, 2025
Open
bors added a commit that referenced this pull request Jul 15, 2025
@bors
Auto merge of #143983 - samueltardieu:rollup-dnoe5xp, r=samueltardieu
601e588 
Rollup of 12 pull requests

Successful merges:

 - #142936 (rustdoc-json: Structured attributes)
 - #143355 (wrapping shift: remove first bitmask and table)
 - #143448 (remote-test-client: Exit code `128 + <signal-number>` instead of `3`)
 - #143692 (miri: fix out-of-bounds error for ptrs with negative offsets)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143738 (Move several float tests to floats/mod.rs)
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143920 (Make more of codegen_llvm safe)
 - #143921 (Constify `Index` traits)
 - #143939 (Add 0323pin as maintainer of NetBSD targets, fix link to pkgsrc-wip and explain.)
 - #143948 (Update mdbook to 0.4.52)
 - #143968 (Add tracing to `InterpCx::fn_abi_of_instance/fn_abi_of_fn_ptr`)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit that referenced this pull request Jul 15, 2025
@bors
Auto merge of #143983 - samueltardieu:rollup-dnoe5xp, r=samueltardieu
453df83 
Rollup of 12 pull requests

Successful merges:

 - #142936 (rustdoc-json: Structured attributes)
 - #143355 (wrapping shift: remove first bitmask and table)
 - #143448 (remote-test-client: Exit code `128 + <signal-number>` instead of `3`)
 - #143692 (miri: fix out-of-bounds error for ptrs with negative offsets)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143738 (Move several float tests to floats/mod.rs)
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143920 (Make more of codegen_llvm safe)
 - #143921 (Constify `Index` traits)
 - #143939 (Add 0323pin as maintainer of NetBSD targets, fix link to pkgsrc-wip and explain.)
 - #143948 (Update mdbook to 0.4.52)
 - #143968 (Add tracing to `InterpCx::fn_abi_of_instance/fn_abi_of_fn_ptr`)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit that referenced this pull request Jul 15, 2025
@bors
Auto merge of #143983 - samueltardieu:rollup-dnoe5xp, r=samueltardieu
d251dc8 
Rollup of 12 pull requests

Successful merges:

 - #142936 (rustdoc-json: Structured attributes)
 - #143355 (wrapping shift: remove first bitmask and table)
 - #143448 (remote-test-client: Exit code `128 + <signal-number>` instead of `3`)
 - #143692 (miri: fix out-of-bounds error for ptrs with negative offsets)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143738 (Move several float tests to floats/mod.rs)
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143920 (Make more of codegen_llvm safe)
 - #143921 (Constify `Index` traits)
 - #143939 (Add 0323pin as maintainer of NetBSD targets, fix link to pkgsrc-wip and explain.)
 - #143948 (Update mdbook to 0.4.52)
 - #143968 (Add tracing to `InterpCx::fn_abi_of_instance/fn_abi_of_fn_ptr`)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit that referenced this pull request Jul 15, 2025
@bors
Auto merge of #143983 - samueltardieu:rollup-dnoe5xp, r=samueltardieu
173a8dd 
Rollup of 12 pull requests

Successful merges:

 - #142936 (rustdoc-json: Structured attributes)
 - #143355 (wrapping shift: remove first bitmask and table)
 - #143448 (remote-test-client: Exit code `128 + <signal-number>` instead of `3`)
 - #143692 (miri: fix out-of-bounds error for ptrs with negative offsets)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143738 (Move several float tests to floats/mod.rs)
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143920 (Make more of codegen_llvm safe)
 - #143921 (Constify `Index` traits)
 - #143939 (Add 0323pin as maintainer of NetBSD targets, fix link to pkgsrc-wip and explain.)
 - #143948 (Update mdbook to 0.4.52)
 - #143968 (Add tracing to `InterpCx::fn_abi_of_instance/fn_abi_of_fn_ptr`)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit that referenced this pull request Jul 15, 2025
@bors
Auto merge of #143983 - samueltardieu:rollup-dnoe5xp, r=samueltardieu
c0d7b5d 
Rollup of 12 pull requests

Successful merges:

 - #142936 (rustdoc-json: Structured attributes)
 - #143355 (wrapping shift: remove first bitmask and table)
 - #143448 (remote-test-client: Exit code `128 + <signal-number>` instead of `3`)
 - #143692 (miri: fix out-of-bounds error for ptrs with negative offsets)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143738 (Move several float tests to floats/mod.rs)
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143920 (Make more of codegen_llvm safe)
 - #143921 (Constify `Index` traits)
 - #143939 (Add 0323pin as maintainer of NetBSD targets, fix link to pkgsrc-wip and explain.)
 - #143948 (Update mdbook to 0.4.52)
 - #143968 (Add tracing to `InterpCx::fn_abi_of_instance/fn_abi_of_fn_ptr`)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit that referenced this pull request Jul 15, 2025
@bors
Auto merge of #143983 - samueltardieu:rollup-dnoe5xp, r=samueltardieu
fa7e171 
Rollup of 12 pull requests

Successful merges:

 - #142936 (rustdoc-json: Structured attributes)
 - #143355 (wrapping shift: remove first bitmask and table)
 - #143448 (remote-test-client: Exit code `128 + <signal-number>` instead of `3`)
 - #143692 (miri: fix out-of-bounds error for ptrs with negative offsets)
 - #143719 (Emit warning when there is no space between `-o` and arg)
 - #143738 (Move several float tests to floats/mod.rs)
 - #143891 (Port `#[coverage]` to the new attribute system)
 - #143920 (Make more of codegen_llvm safe)
 - #143921 (Constify `Index` traits)
 - #143939 (Add 0323pin as maintainer of NetBSD targets, fix link to pkgsrc-wip and explain.)
 - #143948 (Update mdbook to 0.4.52)
 - #143968 (Add tracing to `InterpCx::fn_abi_of_instance/fn_abi_of_fn_ptr`)

r? `@ghost`
`@rustbot` modify labels: rollup
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