fixes #30927: add undef to printing of empty arrays (#30929)

JuliaLang · Feb 1, 2019 · 585feb0 · 585feb0
1 parent 0ec1727
commit 585feb0
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/base/arrayshow.jl b/base/arrayshow.jl
@@ -410,7 +410,7 @@ _show_nonempty(::IO, ::AbstractVector, ::String) =
 _show_nonempty(io::IO, X::AbstractArray{T,0} where T, prefix::String) = print_array(io, X)
 
 # NOTE: it's not clear how this method could use the :typeinfo attribute
-_show_empty(io::IO, X::Array{T}) where {T} = print(io, "Array{", T, "}(", join(size(X),','), ')')
+_show_empty(io::IO, X::Array{T}) where {T} = print(io, "Array{", T, "}(undef,", join(size(X),','), ')')
 _show_empty(io, X) = nothing # by default, we don't know this constructor
 
 # typeinfo aware (necessarily)

diff --git a/test/show.jl b/test/show.jl
@@ -1453,3 +1453,7 @@ end
 
 # issue #30505
 @test repr(Union{Tuple{Char}, Tuple{Char, Char}}[('a','b')]) == "Union{Tuple{Char}, Tuple{Char,Char}}[('a', 'b')]"
+
+# issue #30927
+Z = Array{Float64}(undef,0,0)
+@test eval(Meta.parse(repr(Z))) == Z