Fix debugger visualizer tuple child ordering w/ PDB debug info by Walnut356 · Pull Request #161726 · rust-lang/rust

Walnut356 · 2026-08-25T08:04:48Z

see: llvm/llvm-project#218613 for an explanation of the issue. tl;dr, PDB fields reflect rustc's reordering, whereas DWARF fields are in source-code-order. This causes issues with GetChildAtIndex in cases where both DWARF- and PDB-based types can interact with them.

This PR uses field names to retrieve field indexes, rather than blindly indexing into the field array.

I did a quick scan over the rest of the GetChildAtIndex calls, and they all fall under a few safe cases

in DWARF or PDB specific providers (mainly enum discriminants, which can't be reordered anyway)
used to get field 0 of a struct with only 1 field
in the summary provider where we're typically already interacting with the synthetic value and synthetic children anyway

cc #161657, fixes tests/debuginfo/tuple-struct.rs on windows-msvc

`windows-msvc` `tests/debuginfo` results with this change

failures:
    [debuginfo-lldb] tests\debuginfo\associated-types.rs
    [debuginfo-lldb] tests\debuginfo\borrowed-basic.rs
    [debuginfo-lldb] tests\debuginfo\borrowed-unique-basic.rs
    [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#no-lto
    [debuginfo-lldb] tests\debuginfo\borrowed-tuple.rs
    [debuginfo-lldb] tests\debuginfo\boxed-struct.rs
    [debuginfo-lldb] tests\debuginfo\captured-fields-2.rs
    [debuginfo-lldb] tests\debuginfo\cross-crate-spans.rs
    [debuginfo-lldb] tests\debuginfo\coroutine-locals.rs
    [debuginfo-lldb] tests\debuginfo\box.rs
    [debuginfo-lldb] tests\debuginfo\captured-fields-1.rs
    [debuginfo-lldb] tests\debuginfo\c-style-enum-in-composite.rs
    [debuginfo-lldb] tests\debuginfo\by-value-self-argument-in-trait-impl.rs
    [debuginfo-lldb] tests\debuginfo\destructured-for-loop-variable.rs
    [debuginfo-lldb] tests\debuginfo\dummy_span.rs
    [debuginfo-lldb] tests\debuginfo\evec-in-struct.rs
    [debuginfo-lldb] tests\debuginfo\destructured-fn-argument.rs
    [debuginfo-lldb] tests\debuginfo\destructured-local.rs
    [debuginfo-lldb] tests\debuginfo\generic-struct.rs
    [debuginfo-lldb] tests\debuginfo\issue-22656.rs
    [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#lto
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-stack-closure.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unconditional-loop.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-with-macro.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unique-closure.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if-let.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scopes-in-block-expression.rs
    [debuginfo-lldb] tests\debuginfo\method-on-generic-struct.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-while.rs
    [debuginfo-lldb] tests\debuginfo\lexical-scope-in-for-loop.rs
    [debuginfo-lldb] tests\debuginfo\name-shadowing-and-scope-nesting.rs
    [debuginfo-lldb] tests\debuginfo\no_mangle-info.rs
    [debuginfo-lldb] tests\debuginfo\packed-struct-with-destructor.rs
    [debuginfo-lldb] tests\debuginfo\pretty-slices.rs
    [debuginfo-lldb] tests\debuginfo\packed-struct.rs
    [debuginfo-lldb] tests\debuginfo\reference-debuginfo.rs
    [debuginfo-lldb] tests\debuginfo\simple-struct.rs
    [debuginfo-lldb] tests\debuginfo\simple-lexical-scope.rs
    [debuginfo-lldb] tests\debuginfo\shadowed-variable.rs
    [debuginfo-lldb] tests\debuginfo\simple-tuple.rs
    [debuginfo-lldb] tests\debuginfo\shadowed-argument.rs
    [debuginfo-lldb] tests\debuginfo\struct-with-destructor.rs
    [debuginfo-lldb] tests\debuginfo\strings-and-strs.rs
    [debuginfo-lldb] tests\debuginfo\struct-in-struct.rs
    [debuginfo-lldb] tests\debuginfo\pretty-std-collections.rs
    [debuginfo-lldb] tests\debuginfo\tuple-in-tuple.rs
    [debuginfo-lldb] tests\debuginfo\thread-names.rs#win
    [debuginfo-lldb] tests\debuginfo\vec-slices.rs
    [debuginfo-lldb] tests\debuginfo\var-captured-in-sendable-closure.rs
    [debuginfo-lldb] tests\debuginfo\var-captured-in-stack-closure.rs
    [debuginfo-lldb] tests\debuginfo\var-captured-in-nested-closure.rs

test result: FAILED. 244 passed; 52 failed; 223 ignored; 0 measured; 0 filtered out; finished in 13.22s

rustbot · 2026-08-25T08:04:53Z

r? @Mark-Simulacrum

rustbot has assigned @Mark-Simulacrum.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

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Owners of files modified in this PR: @Mark-Simulacrum

Walnut356 · 2026-08-25T08:05:16Z

r? @Kobzol

rustbot · 2026-08-25T08:05:20Z

Kobzol is not on the review rotation at the moment.
They may take a while to respond.

Kobzol

For reference: the tuple field names are assigned here.

Thanks! Left one nit, but consider it non-blocking.

@bors delegate

View changes since this review

Kobzol · 2026-08-25T08:14:47Z

-            str(index), element.GetData(), element.GetType()
-        )
+        return self.valobj.GetChildAtIndex(
+            self.valobj.GetIndexOfChildWithName(f"__{index}")


Should this perhaps be using self.get_child_index to avoid dupicating the "logic"?

Ah yeah, it saves us a function call and a conditional per field inspected. Not a huge deal in isolation, but with as common as tuples/tuple structs are, it can really add up.

That bad, huh? In that case it would be good to add a comment here, otherwise someone might come and "optimize" it in the future :)

rust-bors · 2026-08-25T08:15:05Z

✌️ @Walnut356, you can now approve this pull request!

If @Kobzol told you to "r=me" after making some further change, then please make that change and post @bors r=Kobzol.

View changes since this delegation.

Walnut356 · 2026-08-25T09:33:07Z

@bors r=Kobzol

rust-bors · 2026-08-25T09:33:10Z

📌 Commit 2c9b143 has been approved by Kobzol

It is now in the queue for this repository.

Fix debugger visualizer tuple child ordering w/ PDB debug info see: llvm/llvm-project#218613 for an explanation of the issue. tl;dr, PDB fields reflect rustc's reordering, whereas DWARF fields are in source-code-order. This causes issues with `GetChildAtIndex` in cases where both DWARF- and PDB-based types can interact with them. This PR uses field names to retrieve field indexes, rather than blindly indexing into the field array. I did a quick scan over the rest of the `GetChildAtIndex` calls, and they all fall under a few safe cases 1. in DWARF or PDB specific providers (mainly enum discriminants, which can't be reordered anyway) 2. used to get field `0` of a struct with only 1 field 3. in the summary provider where we're typically already interacting with the synthetic value and synthetic children anyway cc rust-lang#161657, fixes `tests/debuginfo/tuple-struct.rs` on `windows-msvc` <details><summary>`windows-msvc` `tests/debuginfo` results with this change</summary> ``` failures: [debuginfo-lldb] tests\debuginfo\associated-types.rs [debuginfo-lldb] tests\debuginfo\borrowed-basic.rs [debuginfo-lldb] tests\debuginfo\borrowed-unique-basic.rs [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#no-lto [debuginfo-lldb] tests\debuginfo\borrowed-tuple.rs [debuginfo-lldb] tests\debuginfo\boxed-struct.rs [debuginfo-lldb] tests\debuginfo\captured-fields-2.rs [debuginfo-lldb] tests\debuginfo\cross-crate-spans.rs [debuginfo-lldb] tests\debuginfo\coroutine-locals.rs [debuginfo-lldb] tests\debuginfo\box.rs [debuginfo-lldb] tests\debuginfo\captured-fields-1.rs [debuginfo-lldb] tests\debuginfo\c-style-enum-in-composite.rs [debuginfo-lldb] tests\debuginfo\by-value-self-argument-in-trait-impl.rs [debuginfo-lldb] tests\debuginfo\destructured-for-loop-variable.rs [debuginfo-lldb] tests\debuginfo\dummy_span.rs [debuginfo-lldb] tests\debuginfo\evec-in-struct.rs [debuginfo-lldb] tests\debuginfo\destructured-fn-argument.rs [debuginfo-lldb] tests\debuginfo\destructured-local.rs [debuginfo-lldb] tests\debuginfo\generic-struct.rs [debuginfo-lldb] tests\debuginfo\issue-22656.rs [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#lto [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-stack-closure.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unconditional-loop.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-with-macro.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unique-closure.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if-let.rs [debuginfo-lldb] tests\debuginfo\lexical-scopes-in-block-expression.rs [debuginfo-lldb] tests\debuginfo\method-on-generic-struct.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-while.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-for-loop.rs [debuginfo-lldb] tests\debuginfo\name-shadowing-and-scope-nesting.rs [debuginfo-lldb] tests\debuginfo\no_mangle-info.rs [debuginfo-lldb] tests\debuginfo\packed-struct-with-destructor.rs [debuginfo-lldb] tests\debuginfo\pretty-slices.rs [debuginfo-lldb] tests\debuginfo\packed-struct.rs [debuginfo-lldb] tests\debuginfo\reference-debuginfo.rs [debuginfo-lldb] tests\debuginfo\simple-struct.rs [debuginfo-lldb] tests\debuginfo\simple-lexical-scope.rs [debuginfo-lldb] tests\debuginfo\shadowed-variable.rs [debuginfo-lldb] tests\debuginfo\simple-tuple.rs [debuginfo-lldb] tests\debuginfo\shadowed-argument.rs [debuginfo-lldb] tests\debuginfo\struct-with-destructor.rs [debuginfo-lldb] tests\debuginfo\strings-and-strs.rs [debuginfo-lldb] tests\debuginfo\struct-in-struct.rs [debuginfo-lldb] tests\debuginfo\pretty-std-collections.rs [debuginfo-lldb] tests\debuginfo\tuple-in-tuple.rs [debuginfo-lldb] tests\debuginfo\thread-names.rs#win [debuginfo-lldb] tests\debuginfo\vec-slices.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-sendable-closure.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-stack-closure.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-nested-closure.rs test result: FAILED. 244 passed; 52 failed; 223 ignored; 0 measured; 0 filtered out; finished in 13.22s ``` </details>

…uwer Rollup of 4 pull requests Successful merges: - #161726 (Fix debugger visualizer tuple child ordering w/ PDB debug info) - #161729 (miri subtree update) - #161724 (Add codegen test for static table search loop unrolling) - #161740 (do not compress debuginfo for Cygwin)

Fix debugger visualizer tuple child ordering w/ PDB debug info see: llvm/llvm-project#218613 for an explanation of the issue. tl;dr, PDB fields reflect rustc's reordering, whereas DWARF fields are in source-code-order. This causes issues with `GetChildAtIndex` in cases where both DWARF- and PDB-based types can interact with them. This PR uses field names to retrieve field indexes, rather than blindly indexing into the field array. I did a quick scan over the rest of the `GetChildAtIndex` calls, and they all fall under a few safe cases 1. in DWARF or PDB specific providers (mainly enum discriminants, which can't be reordered anyway) 2. used to get field `0` of a struct with only 1 field 3. in the summary provider where we're typically already interacting with the synthetic value and synthetic children anyway cc rust-lang#161657, fixes `tests/debuginfo/tuple-struct.rs` on `windows-msvc` <details><summary>`windows-msvc` `tests/debuginfo` results with this change</summary> ``` failures: [debuginfo-lldb] tests\debuginfo\associated-types.rs [debuginfo-lldb] tests\debuginfo\borrowed-basic.rs [debuginfo-lldb] tests\debuginfo\borrowed-unique-basic.rs [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#no-lto [debuginfo-lldb] tests\debuginfo\borrowed-tuple.rs [debuginfo-lldb] tests\debuginfo\boxed-struct.rs [debuginfo-lldb] tests\debuginfo\captured-fields-2.rs [debuginfo-lldb] tests\debuginfo\cross-crate-spans.rs [debuginfo-lldb] tests\debuginfo\coroutine-locals.rs [debuginfo-lldb] tests\debuginfo\box.rs [debuginfo-lldb] tests\debuginfo\captured-fields-1.rs [debuginfo-lldb] tests\debuginfo\c-style-enum-in-composite.rs [debuginfo-lldb] tests\debuginfo\by-value-self-argument-in-trait-impl.rs [debuginfo-lldb] tests\debuginfo\destructured-for-loop-variable.rs [debuginfo-lldb] tests\debuginfo\dummy_span.rs [debuginfo-lldb] tests\debuginfo\evec-in-struct.rs [debuginfo-lldb] tests\debuginfo\destructured-fn-argument.rs [debuginfo-lldb] tests\debuginfo\destructured-local.rs [debuginfo-lldb] tests\debuginfo\generic-struct.rs [debuginfo-lldb] tests\debuginfo\issue-22656.rs [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#lto [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-stack-closure.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unconditional-loop.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-with-macro.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unique-closure.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if-let.rs [debuginfo-lldb] tests\debuginfo\lexical-scopes-in-block-expression.rs [debuginfo-lldb] tests\debuginfo\method-on-generic-struct.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-while.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-for-loop.rs [debuginfo-lldb] tests\debuginfo\name-shadowing-and-scope-nesting.rs [debuginfo-lldb] tests\debuginfo\no_mangle-info.rs [debuginfo-lldb] tests\debuginfo\packed-struct-with-destructor.rs [debuginfo-lldb] tests\debuginfo\pretty-slices.rs [debuginfo-lldb] tests\debuginfo\packed-struct.rs [debuginfo-lldb] tests\debuginfo\reference-debuginfo.rs [debuginfo-lldb] tests\debuginfo\simple-struct.rs [debuginfo-lldb] tests\debuginfo\simple-lexical-scope.rs [debuginfo-lldb] tests\debuginfo\shadowed-variable.rs [debuginfo-lldb] tests\debuginfo\simple-tuple.rs [debuginfo-lldb] tests\debuginfo\shadowed-argument.rs [debuginfo-lldb] tests\debuginfo\struct-with-destructor.rs [debuginfo-lldb] tests\debuginfo\strings-and-strs.rs [debuginfo-lldb] tests\debuginfo\struct-in-struct.rs [debuginfo-lldb] tests\debuginfo\pretty-std-collections.rs [debuginfo-lldb] tests\debuginfo\tuple-in-tuple.rs [debuginfo-lldb] tests\debuginfo\thread-names.rs#win [debuginfo-lldb] tests\debuginfo\vec-slices.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-sendable-closure.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-stack-closure.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-nested-closure.rs test result: FAILED. 244 passed; 52 failed; 223 ignored; 0 measured; 0 filtered out; finished in 13.22s ``` </details>

…uwer Rollup of 13 pull requests Successful merges: - #158874 (hir_ty_lowering: fix anon const type recovery) - #161443 (add internal DSL for testing binders) - #161617 (Add custom allocators to `(try_)map` on `Box`, `Rc`, `Arc`) - #161726 (Fix debugger visualizer tuple child ordering w/ PDB debug info) - #161729 (miri subtree update) - #161745 (make trivial ABI check resilient against new repr) - #160871 (Remove `#[rustc_reservation_impl]`) - #161180 (Detect missing binding available: add a MaybeIncorrect suggestion) - #161522 (test `f16::mul_add` not double-rounding the result) - #161631 (Add two comments relating to new-solver performance) - #161724 (Add codegen test for static table search loop unrolling) - #161740 (do not compress debuginfo for Cygwin) - #161750 (vector ABI check: reword so it makes more sense for non-obviously-vector types)

Rollup merge of #161726 - Walnut356:pdb_tuple_fields, r=Kobzol Fix debugger visualizer tuple child ordering w/ PDB debug info see: llvm/llvm-project#218613 for an explanation of the issue. tl;dr, PDB fields reflect rustc's reordering, whereas DWARF fields are in source-code-order. This causes issues with `GetChildAtIndex` in cases where both DWARF- and PDB-based types can interact with them. This PR uses field names to retrieve field indexes, rather than blindly indexing into the field array. I did a quick scan over the rest of the `GetChildAtIndex` calls, and they all fall under a few safe cases 1. in DWARF or PDB specific providers (mainly enum discriminants, which can't be reordered anyway) 2. used to get field `0` of a struct with only 1 field 3. in the summary provider where we're typically already interacting with the synthetic value and synthetic children anyway cc #161657, fixes `tests/debuginfo/tuple-struct.rs` on `windows-msvc` <details><summary>`windows-msvc` `tests/debuginfo` results with this change</summary> ``` failures: [debuginfo-lldb] tests\debuginfo\associated-types.rs [debuginfo-lldb] tests\debuginfo\borrowed-basic.rs [debuginfo-lldb] tests\debuginfo\borrowed-unique-basic.rs [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#no-lto [debuginfo-lldb] tests\debuginfo\borrowed-tuple.rs [debuginfo-lldb] tests\debuginfo\boxed-struct.rs [debuginfo-lldb] tests\debuginfo\captured-fields-2.rs [debuginfo-lldb] tests\debuginfo\cross-crate-spans.rs [debuginfo-lldb] tests\debuginfo\coroutine-locals.rs [debuginfo-lldb] tests\debuginfo\box.rs [debuginfo-lldb] tests\debuginfo\captured-fields-1.rs [debuginfo-lldb] tests\debuginfo\c-style-enum-in-composite.rs [debuginfo-lldb] tests\debuginfo\by-value-self-argument-in-trait-impl.rs [debuginfo-lldb] tests\debuginfo\destructured-for-loop-variable.rs [debuginfo-lldb] tests\debuginfo\dummy_span.rs [debuginfo-lldb] tests\debuginfo\evec-in-struct.rs [debuginfo-lldb] tests\debuginfo\destructured-fn-argument.rs [debuginfo-lldb] tests\debuginfo\destructured-local.rs [debuginfo-lldb] tests\debuginfo\generic-struct.rs [debuginfo-lldb] tests\debuginfo\issue-22656.rs [debuginfo-lldb] tests\debuginfo\basic-types-globals.rs#lto [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-stack-closure.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unconditional-loop.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-with-macro.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-unique-closure.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-if-let.rs [debuginfo-lldb] tests\debuginfo\lexical-scopes-in-block-expression.rs [debuginfo-lldb] tests\debuginfo\method-on-generic-struct.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-while.rs [debuginfo-lldb] tests\debuginfo\lexical-scope-in-for-loop.rs [debuginfo-lldb] tests\debuginfo\name-shadowing-and-scope-nesting.rs [debuginfo-lldb] tests\debuginfo\no_mangle-info.rs [debuginfo-lldb] tests\debuginfo\packed-struct-with-destructor.rs [debuginfo-lldb] tests\debuginfo\pretty-slices.rs [debuginfo-lldb] tests\debuginfo\packed-struct.rs [debuginfo-lldb] tests\debuginfo\reference-debuginfo.rs [debuginfo-lldb] tests\debuginfo\simple-struct.rs [debuginfo-lldb] tests\debuginfo\simple-lexical-scope.rs [debuginfo-lldb] tests\debuginfo\shadowed-variable.rs [debuginfo-lldb] tests\debuginfo\simple-tuple.rs [debuginfo-lldb] tests\debuginfo\shadowed-argument.rs [debuginfo-lldb] tests\debuginfo\struct-with-destructor.rs [debuginfo-lldb] tests\debuginfo\strings-and-strs.rs [debuginfo-lldb] tests\debuginfo\struct-in-struct.rs [debuginfo-lldb] tests\debuginfo\pretty-std-collections.rs [debuginfo-lldb] tests\debuginfo\tuple-in-tuple.rs [debuginfo-lldb] tests\debuginfo\thread-names.rs#win [debuginfo-lldb] tests\debuginfo\vec-slices.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-sendable-closure.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-stack-closure.rs [debuginfo-lldb] tests\debuginfo\var-captured-in-nested-closure.rs test result: FAILED. 244 passed; 52 failed; 223 ignored; 0 measured; 0 filtered out; finished in 13.22s ``` </details>

…uwer Rollup of 13 pull requests Successful merges: - rust-lang/rust#158874 (hir_ty_lowering: fix anon const type recovery) - rust-lang/rust#161443 (add internal DSL for testing binders) - rust-lang/rust#161617 (Add custom allocators to `(try_)map` on `Box`, `Rc`, `Arc`) - rust-lang/rust#161726 (Fix debugger visualizer tuple child ordering w/ PDB debug info) - rust-lang/rust#161729 (miri subtree update) - rust-lang/rust#161745 (make trivial ABI check resilient against new repr) - rust-lang/rust#160871 (Remove `#[rustc_reservation_impl]`) - rust-lang/rust#161180 (Detect missing binding available: add a MaybeIncorrect suggestion) - rust-lang/rust#161522 (test `f16::mul_add` not double-rounding the result) - rust-lang/rust#161631 (Add two comments relating to new-solver performance) - rust-lang/rust#161724 (Add codegen test for static table search loop unrolling) - rust-lang/rust#161740 (do not compress debuginfo for Cygwin) - rust-lang/rust#161750 (vector ABI check: reword so it makes more sense for non-obviously-vector types)

fix tuple child ordering w/ PDB debug info

2c9b143

rustbot assigned Mark-Simulacrum Aug 25, 2026

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Aug 25, 2026

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Rollup of 9 pull requests #161749

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Fix debugger visualizer tuple child ordering w/ PDB debug info - #161726

Fix debugger visualizer tuple child ordering w/ PDB debug info#161726
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