Delete some GDB debugvis cruft

[clarfonthey]

Based upon discussion on Zulip: #t-compiler/debuginfo > GDB debugvis cruft

This ensures that ruff check passes, which will verify that it works on Python 3.9 (lowest valid version for Ruff to check). It removes:

• old HashMap/HashSet stuff (rust-gdb is managed by rustup now)
• Python 2 support (EOL, not really verifiable anyway)
• GDB <7.12 support (this is 10 years old)

It also replaces the glob imports with ones that ruff check will be able to verify.

I would like to do more refactoring here and potentially split apart the visualisers across the various libstd crates (core, alloc, and std) but that is a larger change that this one, and this is mostly just to get verification on the changes being acceptable.

[rustbot]

r? @Mark-Simulacrum

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[clarfonthey]

This removes Python 2 support, which was probably broken anyway. Not really possible to say.

[clarfonthey]

Mentioned in other file, but this is older GDB support.

[rust-log-analyzer]

The job aarch64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

Executing "/scripts/stage_2_test_set1.sh"
+ /scripts/stage_2_test_set1.sh
PR_CI_JOB set; skipping tidy
+ '[' 1 == 1 ']'
+ echo 'PR_CI_JOB set; skipping tidy'
+ SKIP_TIDY='--skip tidy'
+ ../x.py --stage 2 test --skip tidy --skip compiler --skip src
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
downloading https://static.rust-lang.org/dist/2026-03-05/rustfmt-nightly-aarch64-unknown-linux-gnu.tar.xz
---

---- [debuginfo-gdb] tests/debuginfo/pretty-std-collections.rs stdout ----
NOTE: compiletest thinks it is using GDB version 16003000

error: check directive(s) from `/checkout/tests/debuginfo/pretty-std-collections.rs` not found in debugger output. errors:
    (pretty-std-collections.rs:49) `$13 = HashSet(size=4) = {1, 2, 3, 4}`
the following subset of check directive(s) was found successfully:
    (pretty-std-collections.rs:11) `$1 = BTreeSet(size=15) = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}`
    (pretty-std-collections.rs:14) `$2 = BTreeSet(size=0)`
    (pretty-std-collections.rs:17) `$3 = BTreeMap(size=15) = {[0] = 0, [1] = 1, [2] = 2, [3] = 3, [4] = 4, [5] = 5, [6] = 6, [7] = 7, [8] = 8, [9] = 9, [10] = 10, [11] = 11, [12] = 12, [13] = 13, [14] = 14}`
    (pretty-std-collections.rs:20) `$4 = BTreeMap(size=0)`
    (pretty-std-collections.rs:23) `$5 = BTreeMap(size=2) = {[false] = core::option::Option<bool>::None, [true] = core::option::Option<bool>::Some(true)}`
    (pretty-std-collections.rs:27) `$6 = BTreeMap(size=15) = {[0] = pretty_std_collections::MyLeafNode (0), [1] = pretty_std_collections::MyLeafNode (1), [2] = pretty_std_collections::MyLeafNode (2), [3] = pretty_std_collections::MyLeafNode (3), [4] = pretty_std_collections::MyLeafNode (4), [5] = pretty_std_collections::MyLeafNode (5), [6] = pretty_std_collections::MyLeafNode (6), [7] = pretty_std_collections::MyLeafNode (7), [8] = pretty_std_collections::MyLeafNode (8), [9] = pretty_std_collections::MyLeafNode (9), [10] = pretty_std_collections::MyLeafNode (10), [11] = pretty_std_collections::MyLeafNode (11), [12] = pretty_std_collections::MyLeafNode (12), [13] = pretty_std_collections::MyLeafNode (13), [14] = pretty_std_collections::MyLeafNode (14)}`
    (pretty-std-collections.rs:31) `$7 = BTreeMap(size=1) = {[()] = 1}`
    (pretty-std-collections.rs:34) `$8 = BTreeMap(size=1) = {[1] = ()}`
    (pretty-std-collections.rs:37) `$9 = BTreeMap(size=1) = {[()] = ()}`
    (pretty-std-collections.rs:40) `$10 = VecDeque(size=3) = {5, 3, 7}`
    (pretty-std-collections.rs:43) `$11 = VecDeque(size=7) = {2, 3, 4, 5, 6, 7, 8}`
    (pretty-std-collections.rs:46) `$12 = HashMap(size=4) = {[1] = 10, [2] = 20, [3] = 30, [4] = 40}`
status: exit status: 0
command: PYTHONPATH="/checkout/src/etc" "/usr/bin/gdb" "-quiet" "-batch" "-nx" "-command=/checkout/obj/build/aarch64-unknown-linux-gnu/test/debuginfo/pretty-std-collections.gdb/pretty-std-collections.debugger.script"
--- stdout -------------------------------
GNU gdb (Ubuntu 16.3-1ubuntu2) 16.3
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "aarch64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
Breakpoint 1 at 0x2e638: file /checkout/tests/debuginfo/pretty-std-collections.rs, line 147.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".

Breakpoint 1, pretty_std_collections::main () at /checkout/tests/debuginfo/pretty-std-collections.rs:147
147     zzz(); // #break
$1 = BTreeSet(size=15) = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}
$2 = BTreeSet(size=0)
$3 = BTreeMap(size=15) = {[0] = 0, [1] = 1, [2] = 2, [3] = 3, [4] = 4, [5] = 5, [6] = 6, [7] = 7, [8] = 8, [9] = 9, [10] = 10, [11] = 11, [12] = 12, [13] = 13, [14] = 14}
$4 = BTreeMap(size=0)
$5 = BTreeMap(size=2) = {[false] = core::option::Option<bool>::None, [true] = core::option::Option<bool>::Some(true)}
$6 = BTreeMap(size=15) = {[0] = pretty_std_collections::MyLeafNode (0), [1] = pretty_std_collections::MyLeafNode (1), [2] = pretty_std_collections::MyLeafNode (2), [3] = pretty_std_collections::MyLeafNode (3), [4] = pretty_std_collections::MyLeafNode (4), [5] = pretty_std_collections::MyLeafNode (5), [6] = pretty_std_collections::MyLeafNode (6), [7] = pretty_std_collections::MyLeafNode (7), [8] = pretty_std_collections::MyLeafNode (8), [9] = pretty_std_collections::MyLeafNode (9), [10] = pretty_std_collections::MyLeafNode (10), [11] = pretty_std_collections::MyLeafNode (11), [12] = pretty_std_collections::MyLeafNode (12), [13] = pretty_std_collections::MyLeafNode (13), [14] = pretty_std_collections::MyLeafNode (14)}
$7 = BTreeMap(size=1) = {[()] = 1}
$8 = BTreeMap(size=1) = {[1] = ()}
$9 = BTreeMap(size=1) = {[()] = ()}
$10 = VecDeque(size=3) = {5, 3, 7}
$11 = VecDeque(size=7) = {2, 3, 4, 5, 6, 7, 8}
$12 = HashMap(size=4) = {[1] = 10, [2] = 20, [3] = 30, [4] = 40}
$13 = std::collections::hash::set::HashSet<u64, core::hash::BuildHasherDefault<pretty_std_collections::SimpleHasher>, alloc::alloc::Global> {base: hashbrown::set::HashSet<u64, core::hash::BuildHasherDefault<pretty_std_collections::SimpleHasher>, alloc::alloc::Global> {map: hashbrown::map::HashMap<u64, (), core::hash::BuildHasherDefault<pretty_std_collections::SimpleHasher>, alloc::alloc::Global> {hash_builder: core::hash::BuildHasherDefault<pretty_std_collections::SimpleHasher> (core::marker::PhantomData<fn() -> pretty_std_collections::SimpleHasher>), table: hashbrown::raw::RawTable<(u64, ()), alloc::alloc::Global> {table: hashbrown::raw::RawTableInner {bucket_mask: 7, ctrl: core::ptr::non_null::NonNull<u8> {pointer: 0xaaaaaab022e0}, growth_left: 3, items: 4}, alloc: alloc::alloc::Global, marker: core::marker::PhantomData<(u64, ())>}}}}
A debugging session is active.

 Inferior 1 [process 233915] will be killed.

Quit anyway? (y or n) [answered Y; input not from terminal]
------------------------------------------
--- stderr -------------------------------
Python Exception <class 'gdb.error'>: There is no member named table.
Python Exception <class 'gdb.error'>: There is no member named table.
------------------------------------------

---- [debuginfo-gdb] tests/debuginfo/pretty-std-collections.rs stdout end ----

failures:

[clarfonthey]

@rustbot author (since I still need to fix these issues)

[rustbot]

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

[rust-bors]

☔ The latest upstream changes (presumably #154824) made this pull request unmergeable. Please resolve the merge conflicts.

[clarfonthey]

Gonna close this for now; there are merge conflicts and I think I want to do this a bit slower first.