#30074 used the wrong notion of consistency since `OneTo(1)` is
consistent (wrt broadcasting) with any range, but `OneTo` cannot
handle `Slice(-1:1)`.

(cherry picked from commit 1884cb4)

* fix #30303, escaping $ when showing Symbols

* use repr instead of escape_string

(cherry picked from commit f0b9499)

Closes #26458

(cherry picked from commit bd21aa7)

(cherry picked from commit 58f9bf7)

Fixes #30337... and while I was there I added a bit more information about what BitArrays do and when you might run into them.

(cherry picked from commit 0d62000)

…30339)

(cherry picked from commit 217d330)

(cherry picked from commit f49cb42)

(cherry picked from commit 891e2ab)

(cherry picked from commit dda6450)

(cherry picked from commit 99b7b75)

…30163)

* order of mul in (l)mul!(::Diagonal,::Sparse)

add tests for non-commutative mul

* Create Quaternions.jl

remove quaternions from generic tests

(cherry picked from commit 3ee8798)

(cherry picked from commit c379900)

Previously, with a multi-versioned system image, there might be additional entries at the end of the clone list
that do not correspond to an actual method (such as jlplt thunks).

Also some code cleanup for clarity.

fix #28648

(cherry picked from commit e51a707)

(cherry picked from commit 072ad7d)

The manual mentions at https://docs.julialang.org/en/v1/manual/environment-variables/#JULIA_WORKER_TIMEOUT-1 a function Base.worker_timeout() but the implementation has instead only a function Distributed.worker_timeout()

(cherry picked from commit 258e08a)

Use _setindex! to fix DimensionMismatch in sparse assignment
Fixes #28963

(cherry picked from commit b73a746)

(cherry picked from commit 6dc205a)

This fixes a corner case where a bug is caused, counter-intuitively,
by an over-estimated intersection.
We have method signatures A and B, with A<B (A is a strict subtype).
We have a dispatch tuple X, where X<:B and !(X<:A).
However, intersection returns X for intersect(X,A). Since there
appears to be a match there and A<B, ml_matches skips the match with B.
The fix just requires dispatch tuples to be a subtype of a signature
in order to match at all.

(cherry picked from commit b167bc2)

* kill workers which don't launch properly

* don't emit spurious error messages

* document how to asynchronously launch workers

(cherry picked from commit 121e814)

* Fix #30006, range getindex accessing fields that might not exist
* Add tests for #30006

(cherry picked from commit 64133f6)

* Remove unused struct CapturedScalars

* Fix method ambiguities in SparseArrays

* Fix HigherOrderFns._copy(f)

(cherry picked from commit f10530e)

(cherry picked from commit f36ace9)

Fixes #28985

(cherry picked from commit b451001)

)

* General performance improvements for sparse matmul
Details for the polyalgorithm are in: #30372

(cherry picked from commit fae262c)

Fixes #30502

(cherry picked from commit 2ab1405)

)

Fixes #15450

(cherry picked from commit 356ceee)

Use the same pattern as in collect_to_with_first! (which is used when size is known).

(cherry picked from commit 184fbc4)

The last attempts were pretty good, but still missed a lot.
But this is what you find when you actually try to test it.
This is not too important, but it can reduce compilation
performance in some case, so it is not ideal.

(cherry picked from commit 76e7421)

fixes #30563

(cherry picked from commit 84a83ab)

…singular matrix (#30576)

Fix #30572

(cherry picked from commit 4d8a968)

This corresponds to macOS 10.12 Sierra. XCode 8 covers El Capitan and
Sierra, so if Travis is giving us XCode 8.x for x < 3, we're on El Cap.
Homebrew supports only three versions of macOS at a time, which means
that El Cap (10.11) is no longer support. This is likely why our Mac
builds are trying to build GCC from source; a bottle might not be
available.

(cherry picked from commit 862fe08)

(cherry picked from commit a25945a)

…deactivated (#30615)

(cherry picked from commit 2931072)

* implement circshift! for SparseMatrixCSC

* factor helper function shifter!, implement efficient circshift! for SparseVector

* add some @inbounds for improved performance

* remove allocations completely, giving a large improvement for small matrices

* some renaming to avoid polluting the module namespace

* remove useless reallocation and fix bug with different in/out types, better tests

* avoid action if iszero(r) and/or iszero(c), move sparse vector shifting helpers to sparsevector.jl

* Make shift amounts deterministic in tests, move sparse vector tests into sparsevector.jl

* comment fix

* for some reason, copy!(a::SparseVector, b::SparseVector) does not work

(cherry picked from commit 94993e9)

)

(cherry picked from commit 21dfef3)

SROA was accidentally treating a pending node as old and thus
getting the wrong type when querying the predecessor. As a result
it thought one of the paths was unreachable causing undefined data
to be introduced on that path (generally the `1.0` that happened to
already be in register).

Fix #29983

(cherry picked from commit da0179c)

I don't have concrete tests for these, but it looks like
they all need the `is_old` predicate for what they're doing,
so switch those over also while we're at it.

(cherry picked from commit 34f7a4a)

Clarify that `firstindex(str)` should always be `1` for any `AbstractString`, as mentioned by @StefanKarpinski [here](#26133 (comment)).

Also reference `prevind` and `eachindex`.

Also introduce the "code unit" terminology and mention the `codeunit` functions.

(cherry picked from commit 3b6773d)

(cherry picked from commit 8b45c9c)

PR #28478 moved the computation of the use counts before the finish call.
to fix #28444. However, the early parts of the finish call fixes up phi
node arguments, which fail to get counted if we look at use counts before
that fixup is performed. This causes #30594 where the only non-trivial use
is on the backedge of the phi and would thus incorrectly fail to get accounted
for. Fix that by taking the use count after phi fixup but before dce.

(cherry picked from commit f8f2045)

broken by their move to cmake causing a switch away from the standard --host/--build autoconf

fix #28046

(cherry picked from commit 041c214)