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RFC: add `freeze` operation - #4001

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honzasp wants to merge 18 commits into

rust-lang:mainfrom

honzasp:freeze

Open

RFC: add `freeze` operation#4001
honzasp wants to merge 18 commits into
rust-lang:mainfrom
honzasp:freeze

Commits on Aug 19, 2026
- RFC: add `freeze` operation
  honzasp
  committed
  aeeb018
- Fix Markdown formatting
  honzasp
  committed
  a572b4a
Commits on Aug 21, 2026
- Specify that padding bytes are not, in fact, frozen
  honzasp
  committed
  40e0492
- Clarify that it's already possible to leak uninit memory using asm or FFI
  honzasp
  committed
  519935e
- Restructure the confusing discussion of in-place freeze
  honzasp
  committed
  75d5cde
- Don't say that `freeze()` works on bits
  honzasp
  committed
  a3c5cf2
- Describe how user code can implement in-place freeze
  honzasp
  committed
  34c3e5c
- Add a paragraph about client requests in Valgrind
  honzasp
  committed
  088d6b6
- Fix syntax
  honzasp
  committed
  eb4e8e9
- Further weaken the language about LLVM lowering of freeze()
  honzasp
  committed
  1d246f4
- Mention workarounds that don't use freeze for use cases 2 and 4
  honzasp
  committed
  2927916
Commits on Aug 25, 2026
- Creating a slice that points to uninit memory is not immediate UB
  honzasp
  committed
  0516d16
Commits on Aug 28, 2026
- Freezing uninitialized bytes during consteval should be deterministic
  honzasp
  committed
  d6380a4
Commits on Aug 30, 2026
- Freeze is not the first nondeterministic operation during consteval
  honzasp
  committed
  1b61a33
Commits on Sep 24, 2026
- Shorten the discussion of LLVM implementation of freeze
  honzasp
  committed
  c72a903
- Add the freeze/frozen naming as unresolved question
  honzasp
  committed
  fc6b257
- Add an unresolved question about possible EB detection
  honzasp
  committed
  4d1867c
Commits on Sep 26, 2026
- Mention additional use cases for freeze
  honzasp
  committed
  6aa5a6c

Commits

Commits on Aug 19, 2026

Commits on Aug 21, 2026

Commits on Aug 25, 2026

Commits on Aug 28, 2026

Commits on Aug 30, 2026

Commits on Sep 24, 2026

Commits on Sep 26, 2026