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Forbid ShallowInitBox after box deref elaboration. #147687

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Forbid ShallowInitBox after box deref elaboration. #147687

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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 14, 2025
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@bors try @rust-timer queue

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rust-bors bot added a commit that referenced this pull request Oct 15, 2025
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Auto merge of #147687 - cjgillot:noshallow-init-box, r=<try>
472fdbf 
Forbid ShallowInitBox after box deref elaboration.
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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 15, 2025
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rust-bors bot commented Oct 15, 2025

☀️ Try build successful (CI)
Build commit: 472fdbf (472fdbff5e8adcc0c5d6905b613add926cbfec40, parent: 235a4c083eb2a2bfe8779d211c3232f39396de00)

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Finished benchmarking commit (472fdbf): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

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

Max RSS (memory usage)

Results (primary -0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 2.1% [1.2%, 3.0%] 2
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 -5.0% [-5.0%, -5.0%] 1
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) -0.3% [-5.0%, 3.0%] 3

Cycles

Results (secondary -2.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 3.9% [3.9%, 3.9%] 1
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -5.0% [-6.0%, -3.9%] 2
All ❌✅ (primary) - - 0

Binary size

Results (primary 0.0%, secondary 0.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 0.1% [0.0%, 0.4%] 14
Regressions ❌
(secondary)		 0.1% [0.0%, 0.1%] 2
Improvements ✅
(primary)		 -0.2% [-0.3%, -0.0%] 9
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 0.0% [-0.3%, 0.4%] 23

Bootstrap: 474.707s -> 474.445s (-0.06%)
Artifact size: 388.17 MiB -> 388.15 MiB (-0.00%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 15, 2025
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