Remove redundancy and fix padding on some bytes display function

[yhx-12243]

Remove redundancy and fix padding on some bytes display function, based on the discussion on #134915 (comment).

[rustbot]

r? @ChrisDenton

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[ChrisDenton]

@rustbot author it seems like this does make a difference in debug output?

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[rustbot]

⚠️ Warning ⚠️

• The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

  • 7cc26c2

  You can start a rebase with the following commands:

  $ # rebase
  $ git pull --rebase https://github.com/rust-lang/rust.git main
  $ git push --force-with-lease
  

[rust-log-analyzer]

The job aarch64-gnu-llvm-20-2 failed! Check out the build log: (web) (plain enhanced) (plain)

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

---- bstr::test_debug stderr ----

thread 'main' (44081) panicked at coretests/tests/bstr.rs:5:5:
assertion `left == right` failed
  left: "\"\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x08\\t\\n\\x11\\x12\\r\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f \\x7f\\x80\\x81\\xfe\\xff\""
 right: "\"\\0\\u{1}\\u{2}\\u{3}\\u{4}\\u{5}\\u{6}\\u{7}\\u{8}\\t\\n\\u{11}\\u{12}\\r\\u{14}\\u{15}\\u{16}\\u{17}\\u{18}\\u{19}\\u{1a}\\u{1b}\\u{1c}\\u{1d}\\u{1e}\\u{1f} \\u{7f}\\x80\\x81\\xFE\\xFF\""
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::assert_failed_inner
   3: core::panicking::assert_failed::<&str, alloc::string::String>
---
---- ffi::cstr::debug stderr ----

thread 'main' (44277) panicked at coretests/tests/ffi/cstr.rs:20:5:
assertion `left == right` failed
  left: "\"abc\\u{1}\\u{2}\\n…\\xFF\""
 right: "\"abc\\x01\\x02\\n…\\xff\""
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::assert_failed_inner
   3: core::panicking::assert_failed::<alloc::string::String, &str>
---
    ffi::cstr::debug

test result: FAILED. 2294 passed; 2 failed; 6 ignored; 0 measured; 0 filtered out; finished in 3.16s

error: test failed, to rerun pass `-p coretests --test coretests`
env -u RUSTC_WRAPPER CARGO_ENCODED_RUSTDOCFLAGS="-Csymbol-mangling-version=v0\u{1f}-Zannotate-moves\u{1f}-Zrandomize-layout\u{1f}-Zunstable-options\u{1f}--check-cfg=cfg(bootstrap)\u{1f}-Wrustdoc::invalid_codeblock_attributes\u{1f}--crate-version\u{1f}1.95.0-nightly\t(78ea67fce\t2026-01-22)" CARGO_ENCODED_RUSTFLAGS="-Csymbol-mangling-version=v0\u{1f}-Zannotate-moves\u{1f}-Zrandomize-layout\u{1f}-Zunstable-options\u{1f}--check-cfg=cfg(bootstrap)\u{1f}-Zmacro-backtrace\u{1f}-Csplit-debuginfo=off\u{1f}-Clink-arg=-L/usr/lib/llvm-20/lib\u{1f}-Cllvm-args=-import-instr-limit=10\u{1f}-Clink-args=-Wl,-z,origin\u{1f}-Clink-args=-Wl,-rpath,$ORIGIN/../lib\u{1f}-Alinker-messages\u{1f}--cap-lints=allow\u{1f}--cfg\u{1f}randomized_layouts" RUSTC="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2-codegen/cg_clif/dist/rustc-clif" RUSTDOC="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2-codegen/cg_clif/dist/rustdoc-clif" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/bin/cargo" "test" "--manifest-path" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2-codegen/cg_clif/build/sysroot_tests/Cargo.toml" "--target-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2-codegen/cg_clif/build/sysroot_tests_target" "--locked" "--target" "aarch64-unknown-linux-gnu" "-p" "coretests" "-p" "alloctests" "--tests" "--" "-q" exited with status ExitStatus(unix_wait_status(25856))
Bootstrap failed while executing `--stage 2 test --skip tests --skip coverage-map --skip coverage-run --skip library --skip tidyselftest`
Command `/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/bin/cargo run -Zwarnings --target aarch64-unknown-linux-gnu -Zbinary-dep-depinfo -j 4 -Zroot-dir=/checkout --locked --color=always --profile=release --manifest-path /checkout/compiler/rustc_codegen_cranelift/build_system/Cargo.toml -- test --download-dir /checkout/obj/build/cg_clif_download --out-dir /checkout/obj/build/aarch64-unknown-linux-gnu/stage2-codegen/cg_clif --no-unstable-features --use-backend cranelift --sysroot llvm --skip-test testsuite.extended_sysroot [workdir=/checkout/compiler/rustc_codegen_cranelift]` failed with exit code 1
Created at: src/bootstrap/src/core/build_steps/test.rs:3867:25
Executed at: src/bootstrap/src/core/build_steps/test.rs:3912:26

Command has failed. Rerun with -v to see more details.
Build completed unsuccessfully in 0:27:37
  local time: Thu Jan 22 03:11:10 UTC 2026
  network time: Thu, 22 Jan 2026 03:11:10 GMT
##[error]Process completed with exit code 1.
##[group]Run echo "disk usage:"