Rollup of 7 pull requests

[RalfJung]

Successful merges:

• Change the message for if_let_guard feature gate #80121 (Change the message for if_let_guard feature gate)
• Fix memory leak in test "mem::uninit_write_slice_cloned_no_drop" #80123 (Fix memory leak in test "mem::uninit_write_slice_cloned_no_drop")
• docs: Edit rustc_span::symbol::Symbol method #80130 (docs: Edit rustc_span::symbol::Symbol method)
• Don't allow const to begin a nonterminal #80135 (Don't allow const to begin a nonterminal)
• Fix typo in rustc_typeck docs #80145 (Fix typo in rustc_typeck docs)
• Edit formatting in Rust Prelude docs #80146 (Edit formatting in Rust Prelude docs)
• Add missing punctuation to std::alloc docs #80147 (Add missing punctuation to std::alloc docs)

Failed merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[RalfJung]

@bors r+ rollup=never p=7

[bors]

📌 Commit 3c6140c has been approved by RalfJung

[bors]

⌛ Testing commit 3c6140c with merge d187726e828d27c19b7ad58f6ace7db1f7a7086e...

[rust-log-analyzer]

The job test-various failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Building wheels for collected packages: PyYAML
  Running setup.py bdist_wheel for PyYAML: started
  Running setup.py bdist_wheel for PyYAML: finished with status 'error'
  Failed building wheel for PyYAML
  Complete output from command /usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-7y4b89zd/PyYAML/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpygr4bnw4pip-wheel- --python-tag cp36:
     or: -c --help [cmd1 cmd2 ...]
     or: -c --help-commands
     or: -c cmd --help
  
---
  |
3 | use std::rc::Rc;
  |     ^^^^^^^^^^^
  |
  = note: `-D unused-imports` implied by `-D warnings`
error: aborting due to previous error

[RUSTC-TIMING] coretests test:true 8.854
error: could not compile `core`
error: could not compile `core`

To learn more, run the command again with --verbose.


command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "test" "--target" "wasm32-unknown-unknown" "-Zbinary-dep-depinfo" "-j" "16" "--release" "--locked" "--color" "always" "--features" "panic-unwind backtrace compiler-builtins-c" "--manifest-path" "/checkout/library/test/Cargo.toml" "-p" "core" "--"


failed to run: /checkout/obj/build/bootstrap/debug/bootstrap --stage 2 test --host= --target wasm32-unknown-unknown src/test/run-make src/test/ui src/test/compile-fail src/test/mir-opt src/test/codegen-units library/core
Build completed unsuccessfully in 0:23:13

[bors]

💔 Test failed - checks-actions

[RalfJung]

#80123 is the culprit.
@bors r-