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Provide structured suggestion for unconstrained generic constant #122802

Merged
merged 1 commit into from
Mar 25, 2024
Merged

Provide structured suggestion for unconstrained generic constant #122802

merged 1 commit into from
Mar 25, 2024

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estebank
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error: unconstrained generic constant
  --> $DIR/const-argument-if-length.rs:18:10
   |
LL |     pad: [u8; is_zst::<T>()],
   |          ^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: {
   |                                   ++++++++++++++++++++++++++

Detect when the constant expression isn't usize and suggest casting:

error: unconstrained generic constant
 --> f300.rs:6:10
  |
6 |     bb::<{!N}>();
  |          ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
  |
help: try adding a `where` bound
  |
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
  |                       ++++++++++++++++++++++++++

Fix #122395.

@estebank
Provide structured suggestion for unconstrained generic constant
6b24fdf 
```
error: unconstrained generic constant
  --> $DIR/const-argument-if-length.rs:18:10
   |
LL |     pad: [u8; is_zst::<T>()],
   |          ^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: {
   |                                   ++++++++++++++++++++++++++
```

Detect when the constant expression isn't `usize` and suggest casting:

```
error: unconstrained generic constant
 --> f300.rs:6:10
  |
6 |     bb::<{!N}>();
  |          ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
  |
help: try adding a `where` bound
  |
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
  |                       ++++++++++++++++++++++++++
```

Fix rust-lang#122395.
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rustbot commented Mar 21, 2024

r? @Nadrieril

rustbot has assigned @Nadrieril.
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@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. labels Mar 21, 2024
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Nadrieril commented Mar 24, 2024 •
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👍 looks good

@bors r+

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bors commented Mar 24, 2024

📌 Commit 6b24fdf has been approved by Nadrieril

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 Mar 24, 2024
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Mar 25, 2024
@matthiaskrgr
Rollup merge of rust-lang#122802 - estebank:unconstrained-generic-con…
5c5d36c 
…st, r=Nadrieril

Provide structured suggestion for unconstrained generic constant

```
error: unconstrained generic constant
  --> $DIR/const-argument-if-length.rs:18:10
   |
LL |     pad: [u8; is_zst::<T>()],
   |          ^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: {
   |                                   ++++++++++++++++++++++++++
```

Detect when the constant expression isn't `usize` and suggest casting:

```
error: unconstrained generic constant
 --> f300.rs:6:10
  |
6 |     bb::<{!N}>();
  |          ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
  |
help: try adding a `where` bound
  |
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
  |                       ++++++++++++++++++++++++++
```

Fix rust-lang#122395.
@matthiaskrgr matthiaskrgr mentioned this pull request Mar 25, 2024
Closed
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 25, 2024
@bors
Auto merge of rust-lang#123023 - matthiaskrgr:rollup-xtfciuv, r=matth…
33c0005 
…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#122802 (Provide structured suggestion for unconstrained generic constant)
 - rust-lang#122858 (Tweak `parse_dot_suffix_expr`)
 - rust-lang#122923 (In `pretty_print_type()`, print `async fn` futures' paths instead of spans.)
 - rust-lang#122990 (Clarify transmute example)
 - rust-lang#122995 (Clean up unnecessary headers/flags in coverage mir-opt tests)
 - rust-lang#123003 (CFI: Handle dyn with no principal)
 - rust-lang#123005 (CFI: Support complex receivers)
 - rust-lang#123020 (Temporarily remove nnethercote from the review rotation.)

r? `@ghost`
`@rustbot` modify labels: rollup
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Mar 25, 2024
@matthiaskrgr
Rollup merge of rust-lang#122802 - estebank:unconstrained-generic-con…
449db0e 
…st, r=Nadrieril

Provide structured suggestion for unconstrained generic constant

```
error: unconstrained generic constant
  --> $DIR/const-argument-if-length.rs:18:10
   |
LL |     pad: [u8; is_zst::<T>()],
   |          ^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: {
   |                                   ++++++++++++++++++++++++++
```

Detect when the constant expression isn't `usize` and suggest casting:

```
error: unconstrained generic constant
 --> f300.rs:6:10
  |
6 |     bb::<{!N}>();
  |          ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
  |
help: try adding a `where` bound
  |
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
  |                       ++++++++++++++++++++++++++
```

Fix rust-lang#122395.
@matthiaskrgr matthiaskrgr mentioned this pull request Mar 25, 2024
Closed
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 25, 2024
@bors
Auto merge of rust-lang#123027 - matthiaskrgr:rollup-nng7h3z, r=matth…
282915c 
…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#120557 (Add rust-lldb pretty printing for Path and PathBuf)
 - rust-lang#122802 (Provide structured suggestion for unconstrained generic constant)
 - rust-lang#122858 (Tweak `parse_dot_suffix_expr`)
 - rust-lang#122990 (Clarify transmute example)
 - rust-lang#122995 (Clean up unnecessary headers/flags in coverage mir-opt tests)
 - rust-lang#123003 (CFI: Handle dyn with no principal)
 - rust-lang#123005 (CFI: Support complex receivers)
 - rust-lang#123020 (Temporarily remove nnethercote from the review rotation.)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 25, 2024
@bors
Auto merge of rust-lang#123027 - matthiaskrgr:rollup-nng7h3z, r=matth…
0ce30e7 
…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#120557 (Add rust-lldb pretty printing for Path and PathBuf)
 - rust-lang#122802 (Provide structured suggestion for unconstrained generic constant)
 - rust-lang#122858 (Tweak `parse_dot_suffix_expr`)
 - rust-lang#122990 (Clarify transmute example)
 - rust-lang#122995 (Clean up unnecessary headers/flags in coverage mir-opt tests)
 - rust-lang#123003 (CFI: Handle dyn with no principal)
 - rust-lang#123005 (CFI: Support complex receivers)
 - rust-lang#123020 (Temporarily remove nnethercote from the review rotation.)

r? `@ghost`
`@rustbot` modify labels: rollup
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bors commented Mar 25, 2024

⌛ Testing commit 6b24fdf with merge dda2372...

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bors commented Mar 25, 2024

☀️ Test successful - checks-actions
Approved by: Nadrieril
Pushing dda2372 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Mar 25, 2024
@bors bors merged commit dda2372 into rust-lang:master Mar 25, 2024
12 checks passed
@rustbot rustbot added this to the 1.79.0 milestone Mar 25, 2024
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A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot) 
  PR_MESSAGE: Automation to keep dependencies in `Cargo.lock` current.
following is the output from `cargo update`:
  COMMIT_MESSAGE: cargo update 
##[endgroup]
Starting download for Cargo-lock
##[error]Unable to find any artifacts for the associated workflow

@Nadrieril
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huh, what's that about?

@rust-timer
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Finished benchmarking commit (dda2372): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 1.0% [0.8%, 1.1%] 2
Regressions ❌
(secondary)		 3.0% [3.0%, 3.0%] 1
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 1.0% [0.8%, 1.1%] 2

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 -0.6% [-0.8%, -0.4%] 5
Improvements ✅
(secondary)		 -2.6% [-2.6%, -2.6%] 1
All ❌✅ (primary) -0.6% [-0.8%, -0.4%] 5

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 669.935s -> 670.821s (0.13%)
Artifact size: 315.12 MiB -> 315.04 MiB (-0.03%)

@slanterns
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Probably #122951 (comment).

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Wrong suggestion for const well-formedness of bool
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