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Reland "Base.Docs: fix Binding constructor for renamed imports" (#61897) (#61903)

The stock `Base.Docs.Binding(m, v)` constructor keeps the local symbol
`v` while normalising the module via `binding_module(m, v)`. For renamed
imports such as `using X: y as z`, this produces a binding to a
non-existent `canonical_owner.z`, so `?` doc lookup fails:

    julia> using Base: isvisible as iv

    help?> iv
      No documentation found.
      Binding `Base.iv` does not exist.

Resolve the alias by walking the binding partition chain: for each
explicit by-name import (`PARTITION_KIND_EXPLICIT` /
`PARTITION_KIND_IMPORTED`), follow the partition's restriction to its
underlying `Core.Binding` and read the canonical `(mod, name)` from its
globalref. Iterate until a non-explicit-import partition is reached,
then defer to `binding_module` for any remaining implicit-import
normalisation.

The iterative walk is needed because neither primitive alone suffices
for chained re-exports: `partition_restriction` only walks one hop
(stopping at the intermediate module for a plain re-export of an
`as`-renamed binding), while `binding_module` walks all hops but drops
the name (losing the canonical symbol when an `as`-rename appears
anywhere in the chain).

The first reland attempt rewrote unconditionally on any explicit by-name
import, which broke the docs build for plain chained re-exports such as
`Libdl.DL_LOAD_PATH` (whose docstring lives one hop upstream of the
local import). See

https://buildkite.com/julialang/julia-master/builds/57392#019e4dd3-f9a5-42dc-984d-374451e1a32b
for the original failure.

Re-lands #61869, originally landed as #55119.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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Recent builds

Builds Branch Commit Type Ran Committer Via Coverage
1548 master Reland "Base.Docs: fix Binding constructor for renamed imports" (#61897) (#61903) The stock `Base.Docs.Binding(m, v)` constructor keeps the local symbol `v` while normalising the module via `binding_module(m, v)`. For renamed imports such as `usi... push web-flow buildkite
77.73
1519 master Base.Linking: Link C runtime libraries by default (#61652) Linux / Windows (glibc) equivalent to https://github.com/JuliaLang/julia/pull/61633. This allows us to turn on `-z def` when linking the sysimage / pkgimages. I tried to emulate a "stand... push web-flow buildkite
78.0
1517 master OpenBLAS: Update to 0.3.32 (#61666) push web-flow buildkite
77.97
1516 master Specialize f in map(f, ::NamedTuple) (#61654) This lack of specialization is problematic, because the result of the map is used in the function body. Without specialization, this causes excessive allocations. This was discovered by @aplavin with... push web-flow buildkite
78.04
1515 master Update mtime of libclang_rt.osx.a after moving (#61647) `mv` preserves the mtime of `libclang_rt.osx.a`, which is older than the mtime of `$(build_prefix)/manifest/compilerrt`, causing subsequent builds to fail with `mv: cannot stat 'usr/lib/darw... push web-flow buildkite
78.07
1514 master Darwin: Ship `libSystem.tbd` + `libclang_rt.osx.a` for sysimage linking (#61633) Prerequisite for https://github.com/JuliaLang/julia/pull/61631 This follows the route that Zig takes for cross-compilation to macOS without relying on the system to... push web-flow buildkite
78.06
1513 master enable `less`/`edit` for documented variables (#53539) We don't store the locations of definitions of variables, but the doc system does (when they are documented). This PR uses that info to make `less` and `edit` work on variables. Fix #53534. push web-flow buildkite
77.84
1512 master Fix JuliaTaskDispatcher deadlock with std::future callers (#61575) Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> push web-flow buildkite
77.88
1654 topolarity:ct/debug-juliac propagate inbounds in `copyto!` (#61566) closes https://github.com/JuliaLang/julia/issues/57003 Pull #539 web-flow buildkite
77.96
1511 master propagate inbounds in `copyto!` (#61566) closes https://github.com/JuliaLang/julia/issues/57003 push web-flow buildkite
77.96
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