HasShape()-trait corresponding to size(::Numbers) (#16444)

Author: M. Schauer

base/number.jl

@@ -11,6 +11,8 @@ ndims(x::Number) = 0
 ndims{T<:Number}(::Type{T}) = 0
 length(x::Number) = 1
 endof(x::Number) = 1
+iteratorsize{T<:Number}(::Type{T}) = HasShape()
+
 getindex(x::Number) = x
 function getindex(x::Number, i::Integer)
     @_inline_meta

test/functional.jl

@@ -38,6 +38,9 @@ end
 @test isequal(filter(x->(x>10), [0 1 2 3 2 1 0]), [])
 @test isequal(filter((ss)->length(ss)==3, ["abcd", "efg", "hij", "klmn", "opq"]), ["efg", "hij", "opq"])
 
+# numbers
+@test size(collect(1)) == size(1)
+
 # zip and filter iterators
 # issue #4718
 @test collect(filter(x->x[1], zip([true, false, true, false],"abcd"))) == [(true,'a'),(true,'c')]