Drop support for Julia 0.4 (#372)

* Increased Julia minimum requirement and removed 0.4 builds from Travis and AppVeyor.
* First pass removing all the pre-0.5 code.
* Fixed up some things so that tests pass again.
* Updated README to remove references to 0.4.
* Removed a some more syntax for supporting 0.4.
* Deprecate at-ngenerate and at-nsplat.
* Deprecate at-functorize.
* Moved at-functorize to to-be-deprecated.jl
* Renamed to-be-deprecated.jl -> deprecated.jl
* Merged ngenerate.jl into deprecated.jl
* Fixed accidental deletion in README (vs just the '(Julia 0.5 and higher)' part).
* Renamed test/to-be-deprecated.jl
* Added some version checks so that deprecation warning are only thrown on 0.6.
* Added deprecation warnings for KERNEL, UTF8String and ASCIIString on 0.6.

.travis.yml

@@ -3,7 +3,6 @@ os:
     - linux
     - osx
 julia:
-    - 0.4
     - 0.5
     - 0.6
     - nightly

README.md

@@ -49,18 +49,10 @@ Please check the list below for the specific syntax you need.
 
 Currently, the `@compat` macro supports the following syntaxes:
 
-* `@compat foo.:bar` — `foo.(:bar)` in 0.4 ([#15032])
-
-* `@compat f.(args...)` — `broadcast(f, args...)` in 0.4 ([#15032])
-
 * `@compat (a::B{T}){T}(c) = d` — the Julia 0.5-style call overload
 
 * `@compat(get(io, s, false))`, with `s` equal to `:limit`, `:compact` or `:multiline`, to detect the corresponding print settings (performs useful work only on Julia 0.5, defaults to `false` otherwise)
 
-* `@compat import Base.show` and `@compat function show(args...)` for handling the deprecation of `writemime` in Julia 0.5 ([#16563]). See https://github.com/JuliaLang/Compat.jl/pull/219.
-
-* `@compat @boundscheck checkbounds(...)` rewrites to unconditionally call `checkbounds(...)` in 0.4.  The 0.4-style two-argument form of `@boundscheck` is left unchanged.
-
 * `@compat Nullable(value, hasvalue)` to handle the switch from the `Nullable` `:isnull` field to `:hasvalue` field ([#18510])
 
 * `@compat x .= y` converts to an in-place assignment to `x` (via `broadcast!`) ([#17510]).
@@ -70,7 +62,7 @@ Currently, the `@compat` macro supports the following syntaxes:
   assignment operators (`.*=` and so on).
 
 * `@compat Array{<:Real}`, `@compat Array{>:Int}`, and similar uses of `<:T` (resp. `>:T`) to define a set of "covariant" (resp. "contravariant") parameterized types ([#20414]).
-  In 0.4 and 0.5, this only works for non-nested usages (e.g. you can't define `Array{<:Array{<:Real}}`).
+  In 0.5, this only works for non-nested usages (e.g. you can't define `Array{<:Array{<:Real}}`).
 
 * `@compat abstract type T end` and `@compat primitive type T 8 end`
   to declare abstract and primitive types. [#20418]
@@ -81,31 +73,14 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `@compat Base.IndexStyle(::Type{<:MyArray}) = IndexLinear()` and `@compat Base.IndexStyle(::Type{<:MyArray}) = IndexCartesian()` to define traits for abstract arrays, replacing the former `Base.linearindexing{T<:MyArray}(::Type{T}) = Base.LinearFast()` and `Base.linearindexing{T<:MyArray}(::Type{T}) = Base.LinearSlow()`, respectively.
 
-* `Compat.collect(A)` returns an `Array`, no matter what indices the array `A` has (Julia 0.5 and higher). [#21257]
+* `Compat.collect(A)` returns an `Array`, no matter what indices the array `A` has. [#21257]
 
 ## Module Aliases
 
 * In 0.6, some 0.5 iterator functions have been moved to the `Base.Iterators`
   module. Code can be written to work on both 0.5 and 0.6 by `import`ing or
   `using` the `Compat.Iterators` module instead. ([#18839])
 
-* The `Compat.Iterators` module is also available on 0.4, including the
-  iterator functions `partition`, `product`, and `flatten`, which were
-  introduced in Julia 0.5. However, because of a variety of other changes to
-  the iterator system between 0.4 and 0.5, these functions behave slightly
-  differently. For example, the `Iterators.product` function on 0.4 does not
-  return objects with shapes. ([#14596], [#14805], [#15409])
-
-## Type Aliases
-
-* In 0.5, `ASCIIString` and `ByteString` were deprecated, and `UTF8String` was renamed to the (now concrete) type `String`.
-
-    Compat provides unexported `Compat.UTF8String` and `Compat.ASCIIString` type aliases which are equivalent to the same types from Base on Julia 0.4, but to `String` on Julia 0.5. In most cases, using these types by calling `import Compat: UTF8String, ASCIIString` should be enough. Note that `Compat.ASCIIString` does **not** guarantee that the string only contains ASCII characters on Julia 0.5: call `isascii` to check if the string is pure ASCII if needed.
-
-    Compat also provides an unexported `Compat.String` type which is equivalent to `ByteString` on Julia 0.4, and to `String` on Julia 0.5. This type should be used only in places where `ByteString` was used on Julia 0.4, i.e. where either `ASCIIString` or `UTF8String` should be accepted. It should **not** be used as the default type for variables or fields holding strings, as it introduces type-instability in Julia 0.4: use `Compat.UTF8String` or `Compat.ASCIIString` instead.
-
-* `bytestring` has been replaced in most cases with additional `String` construction methods; for 0.4 compatibility, the usage involves replacing `bytestring(args...)` with `Compat.String(args...)`. However, for converting a `Ptr{UInt8}` to a string, use the new `unsafe_string(...)` method to make a copy or `unsafe_wrap(String, ...)` to avoid a copy.
-
 ## New functions, macros, and methods
 
 * `@views` takes an expression and converts all slices to views ([#20164]), while
@@ -117,14 +92,6 @@ Currently, the `@compat` macro supports the following syntaxes:
   For this to work in older versions of Julia (prior to 0.5) that don't have dot calls,
   you should instead use `@dotcompat`, which combines the `@__dot__` and `@compat` macros.
 
-* `foreach`, similar to `map` but when the return value is not needed ([#13744])
-
-* `walkdir`, returns an iterator that walks the directory tree of a directory ([#13707])
-
-* `allunique`, checks whether all elements in an iterable appear only once ([#15914])
-
-* `Base.promote_eltype_op` is available as `Compat.promote_eltype_op`
-
 * [`normalize`](http://docs.julialang.org/en/latest/stdlib/linalg/?highlight=normalize#Base.normalize) and [`normalize!`](http://docs.julialang.org/en/latest/stdlib/linalg/?highlight=normalize#Base.normalize!), normalizes a vector with respect to the p-norm ([#13681])
 
 * `redirect_stdout`, `redirect_stderr`, and `redirect_stdin` take an optional function as a first argument, `redirect_std*(f, stream)`, so that one may use `do` block syntax (as first available for Julia 0.6)
@@ -167,7 +134,7 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `bswap` is supported for `Complex` arguments on 0.5 and below. ([#21346])
 
 * `Compat.invokelatest` is equivalent to `Base.invokelatest` in Julia 0.6,
-  but works in Julia 0.4+, and allows you to guarantee that a function call
+  but works in Julia 0.5+, and allows you to guarantee that a function call
   invokes the latest version of a function ([#19784]).
 
 * `Compat.StringVector` is supported on 0.5 and below. On 0.6 and later, it aliases `Base.StringVector`. This function allocates a `Vector{UInt8}` whose data can be made into a `String` in constant time; that is, without copying. On 0.5 and later, use `String(...)` with the vector allocated by `StringVector` as an argument to create a string without copying. Note that if 0.4 support is needed, `Compat.UTF8String(...)` should be used instead. ([#19449])
@@ -178,40 +145,6 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 ## Renamed functions
 
-* `pointer_to_array` and `pointer_to_string` have been replaced with `unsafe_wrap(Array, ...)` and `unsafe_wrap(String, ...)` respectively
-
-* `bytestring(::Ptr, ...)` has been replaced with `unsafe_string`
-
-* `super` is now `supertype` ([#14338])
-
-* `qr(A, pivot=b)` is now `qr(A, Val{b})`, likewise for `qrfact` and `qrfact!`
-
-* `readall` and `readbytes` are now `readstring` and `read` ([#14660])
-
-* `get_bigfloat_precision` is now `precision(BigFloat)`, `set_precision` is `setprecision` and `with_bigfloat_precision` is now also `setprecision`
-([#13232])
-
-* `get_rounding` is now `rounding`. `set_rounding` and `with_rounding` are now `setrounding` ([#13232])
-
-*  `Base.tty_size` (which was not exported) is now `displaysize` in Julia 0.5
-
-* `Compat.LinAlg.checksquare` ([#14601])
-
-* `issym` is now `issymmetric` ([#15192])
-
-* `istext` is now `istextmime` ([#15708])
-
-* `symbol` is now `Symbol` ([#16154])
-
-* `write(::IO, ::Ptr, len)` is now `unsafe_write` ([#14766])
-
-* `slice` is now `view` ([#16972]); do `import Compat.view` and then use `view` normally without the `@compat` macro
-
-* `fieldoffsets` has been deprecated in favor of `fieldoffset` ([#14777])
-
-* `print_escaped` is now another method of `escape_string`, `print_unescaped` a method of `unescape_string`, and `print_joined` a method of `join` ([#16603])
-
-* `writemime` has been merged into `show` ([#16563]). Note that to extend this function requires `@compat`; see the [Supported Syntax](#supported-syntax) section for more information
 
 * `$` is now `xor` or `⊻` ([#18977])
 
@@ -221,12 +154,6 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 ## New macros
 
-* `@static` has been added ([#16219])
-
-* `@functorize` (not present in any Julia version) takes a function (or operator) and turns it into a functor object if one is available in the used Julia version. E.g. something like `mapreduce(Base.AbsFun(), Base.MulFun(), x)` can now be written as `mapreduce(@functorize(abs), @functorize(*), x)`, and `f(::Base.AbsFun())` as `f(::typeof(@functorize(abs)))`, to work across different Julia versions. `Func{1}` can be written as `supertype(typeof(@functorize(abs)))` (and so on for `Func{2}`), which will fall back to `Function` on Julia 0.5.
-
-* `Compat.@blasfunc` makes functionality of `Base.LinAlg.BLAS.@blasfunc` available on older Julia versions
-
 * `@__DIR__` has been added ([#18380])
 
 * `@vectorize_1arg` and `@vectorize_2arg` are deprecated on Julia 0.6 in favor
@@ -241,32 +168,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 ## Other changes
 
-* `remotecall`, `remotecall_fetch`, `remotecall_wait`, and `remote_do` have the function to be executed remotely as the first argument in Julia 0.5. Loading `Compat` defines the same methods in older versions of Julia ([#13338])
-
-* `Base.FS` is now `Base.Filesystem` ([#12819])
-  Compat provides an unexported `Compat.Filesystem` module that is aliased to
-  `Base.FS` on Julia 0.4 and `Base.Filesystem` on Julia 0.5.
-
-* `cov` and `cor` don't allow keyword arguments anymore. Loading Compat defines compatibility methods for the new API ([#13465])
-
 * On versions of Julia that do not contain a Base.Threads module, Compat defines a Threads module containing a no-op `@threads` macro.
 
-* `Base.SingleAsyncWork` is now `Base.AsyncCondition`
-  Compat provides an unexported `Compat.AsyncCondition` type that is aliased to
-  `Base.SingleAsyncWork` on Julia 0.4 and `Base.AsyncCondition` on Julia 0.5.
-
-* `repeat` now accepts any `AbstractArray` ([#14082]): `Compat.repeat` supports this new API on Julia 0.4, and calls `Base.repeat` on 0.5.
-
-* `OS_NAME` is now `Sys.KERNEL`. OS information available as `is_apple`, `is_bsd`, `is_linux`, `is_unix`, and `is_windows` ([#16219])
-
-* `cholfact`, `cholfact!`, and `chol` require that input is either `Hermitian`, `Symmetric`
-or that the elements are perfectly symmetric or Hermitian on 0.5. Compat now defines methods
-for `HermOrSym` such that using the new methods are backward compatible.
-
-* `Diagonal` and `*` methods support `SubArray`s even on 0.4.
-
-* Single-argument `min`, `max` and `minmax` are defined on 0.4.
-
 * The `Expr(:macrocall)` has an extra initial argument `__source__`, which can be tested for with `Compat.macros_have_sourceloc`.
 
 ## New types

REQUIRE

@@ -1 +1 @@
-julia 0.4
+julia 0.5

appveyor.yml

@@ -1,7 +1,5 @@
 environment:
   matrix:
-  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/0.4/julia-0.4-latest-win32.exe"
-  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/0.4/julia-0.4-latest-win64.exe"
   - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/0.5/julia-0.5-latest-win32.exe"
   - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/0.5/julia-0.5-latest-win64.exe"
   - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/0.6/julia-0.6-latest-win32.exe"