permit NamedTuple{<:Any, Union{}} to be created #53516
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vtjnash
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JeffBezanson
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This is a NamedTuple where all of the fields exist but have type
Union{}. It can be useful for initializing a typejoin in some cases, and
unlike Tuple{Union{}} there are no problems with covariance that should
be preventing it from existing. A few parameters of some constructors were
adjusted for performance and correctness (mostly the former).
Really just an edge case, since nobody should reasonably need a type
that cannot be constructed, but it does seem to mildly improve the
quality of some type queries such as these:
```
julia> fieldtype(NamedTuple{(:a, :b), T} where T<:Union{}, :a)
was: ERROR: TypeError: in fieldtype, expected DataType, got Type{Union{}}
now: Union{}
julia> fieldtypes(NamedTuple{(:a, :b), T} where T<:Union{})
was: ERROR: TypeError: in fieldtype, expected DataType, got Type{Union{}}
now: (Union{}, Union{})
```
Note that `NamedTuple{(), Union{}}` is disallowed still, as that
`Union{}` implies that the generating `Tuple` had least one field.
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Backported PRs: - [x] #39071 <!-- Add a lazy `logrange` function and `LogRange` type --> - [x] #51802 <!-- Allow AnnotatedStrings in log messages --> - [x] #53369 <!-- Orthogonalize re-indexing for FastSubArrays --> - [x] #48050 <!-- improve `--heap-size-hint` arg handling --> - [x] #53482 <!-- add IR encoding for EnterNode --> - [x] #53499 <!-- Avoid compiler warning about redefining jl_globalref_t --> - [x] #53507 <!-- update staled `Core.Compiler.Effects` documentation --> - [x] #53408 <!-- task splitting: change additive accumulation to multiplicative --> - [x] #53523 <!-- add back an alias for `check_top_bit` --> - [x] #53377 <!-- add _readdirx for returning more object info gathered during dir scan --> - [x] #53525 <!-- fix InteractiveUtils call in Base.runtests on failure --> - [x] #53540 <!-- use more efficient `_readdirx` for tab completion --> - [x] #53545 <!-- use `_readdirx` for `walkdir` --> - [x] #53551 <!-- revert "Add @create_log_macro for making custom styled logging macros (#52196)" --> - [x] #53554 <!-- Always return a value in 1-d circshift! of abstractarray.jl --> - [x] #53424 <!-- yet more atomics & cache-line fixes on work-stealing queue --> - [x] #53571 <!-- Update Documenter to v1.3 for inventory writing --> - [x] #53403 <!-- Move parallel precompilation to Base --> - [x] #53589 <!-- add back `unsafe_convert` to pointer for arrays --> - [x] #53596 <!-- build: remove extra .a file --> - [x] #53606 <!-- fix error path in `precompilepkgs` --> - [x] #53004 <!-- Unexport with, at_with, and ScopedValue from Base --> - [x] #53629 <!-- typo fix in scoped values docs --> - [x] #53630 <!-- sroa: Fix incorrect scope counting --> - [x] #53598 <!-- Use Base parallel precompilation to build stdlibs --> - [x] #53649 <!-- precompilepkgs: package in boths deps and weakdeps are in fact only weak --> - [x] #53671 <!-- Fix bootstrap Base precompile in cross compile configuration --> - [x] #52125 <!-- Load Pkg if not already to reinstate missing package add prompt --> - [x] #53602 <!-- Handle zero on arrays of unions of number types and missings --> - [x] #53516 <!-- permit NamedTuple{<:Any, Union{}} to be created --> - [x] #53643 <!-- Bump CSL to 1.1.1 to fix libgomp bug --> - [x] #53679 <!-- move precompile workload back from Base --> - [x] #53663 <!-- add isassigned methods for reinterpretarray --> - [x] #53662 <!-- [REPL] fix incorrectly cleared line after completions accepted --> - [x] #53611 <!-- Linalg: matprod_dest for Diagonal and adjvec --> - [x] #53659 <!-- fix #52025, re-allow all implicit pointer casts in cconvert for Array --> - [x] #53631 <!-- LAPACK: validate input parameters to throw informative errors --> - [x] #53628 <!-- Make some improvements to the Scoped Values documentation. --> - [x] #53655 <!-- Change tbaa of ptr_phi to tbaa_value --> - [x] #53391 <!-- Default to the medium code model in x86 linux --> - [x] #53699 <!-- Move `isexecutable, isreadable, iswritable` to `filesystem.jl` --> - [x] #41232 <!-- Fix linear indexing for ReshapedArray if the parent has offset axes --> - [x] #53527 <!-- Enable analyzegc checks for try catch and fix found issues --> - [x] #52092 - [x] #53682 <!-- Increase build precompilation --> - [x] #53720 - [x] #53553 <!-- typeintersect: fix `UnionAll` unaliasing bug caused by innervars. --> Contains multiple commits, manual intervention needed: - [ ] #53305 <!-- Propagate inbounds in isassigned with CartesianIndex indices --> Non-merged PRs with backport label: - [ ] #53736 <!-- fix literal-pow to return the right type when the base is -1 --> - [ ] #53707 <!-- Make ScopedValue public --> - [ ] #53696 <!-- add invokelatest to on_done callback in bracketed paste --> - [ ] #53660 <!-- put Logging back in default sysimage --> - [ ] #53509 <!-- revert moving "creating packages" from Pkg.jl --> - [ ] #53452 <!-- RFC: allow Tuple{Union{}}, returning Union{} --> - [ ] #53402 <!-- Add `jl_getaffinity` and `jl_setaffinity` --> - [ ] #52694 <!-- Reinstate similar for AbstractQ for backward compatibility --> - [ ] #51928 <!-- Styled markdown, with a few tweaks --> - [ ] #51816 <!-- User-themable stacktraces --> - [ ] #51811 <!-- Make banner size depend on terminal size --> - [ ] #51479 <!-- prevent code loading from lookin in the versioned environment when building Julia -->
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Backported PRs: - [x] #50759 <!-- Fix outdated usage of scrubbing for log test failures --> - [x] #51830 <!-- Add version string to sysimg triple --> - [x] #53273 <!-- [REPL] Fix typo in using/import completion --> - [x] #53499 <!-- Avoid compiler warning about redefining jl_globalref_t --> - [x] #53424 <!-- yet more atomics & cache-line fixes on work-stealing queue --> - [x] #53596 <!-- build: remove extra .a file --> - [x] #53516 <!-- permit NamedTuple{<:Any, Union{}} to be created --> - [x] #53643 <!-- Bump CSL to 1.1.1 to fix libgomp bug --> - [x] #53655 <!-- Change tbaa of ptr_phi to tbaa_value --> - [x] #53391 <!-- Default to the medium code model in x86 linux --> - [x] #53809 <!-- Add missing GC_POP() in emit_cfunction --> - [x] #53961 <!-- `LazyString` in `LinearAlgebra.checksquare` error message --> - [x] #52913 <!-- Added docstring for Artifacts.jl --> - [x] #53553 <!-- typeintersect: fix `UnionAll` unaliasing bug caused by
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This is a NamedTuple where all of the fields exist but have type Union{}. It can be useful for initializing a typejoin in some cases, and unlike Tuple{Union{}} there are no problems with covariance that should need to prevent it from existing. A few parameters of some existing constructors were adjusted for performance and correctness with handling this option (mostly the former).
Seems like really just an edge case, since nobody should reasonably need a type that cannot be constructed, but it is a subtype of Tuple, and having it implemented does seem to mildly improve the quality of some type queries such as these: