diff --git a/base/multidimensional.jl b/base/multidimensional.jl
index 385e9e218f891..272b528f964d9 100644
--- a/base/multidimensional.jl
+++ b/base/multidimensional.jl
@@ -48,6 +48,7 @@ one{N}(::CartesianIndex{N}) = one(CartesianIndex{N})
 one{N}(::Type{CartesianIndex{N}}) = CartesianIndex(ntuple(x -> 1, Val{N}))
 
 # arithmetic, min/max
+(-){N}(index::CartesianIndex{N}) = CartesianIndex{N}(map(-, index.I))
 (+){N}(index1::CartesianIndex{N}, index2::CartesianIndex{N}) = CartesianIndex{N}(map(+, index1.I, index2.I))
 (-){N}(index1::CartesianIndex{N}, index2::CartesianIndex{N}) = CartesianIndex{N}(map(-, index1.I, index2.I))
 min{N}(index1::CartesianIndex{N}, index2::CartesianIndex{N}) = CartesianIndex{N}(map(min, index1.I, index2.I))
diff --git a/base/permuteddimsarray.jl b/base/permuteddimsarray.jl
index aa2944f7c4bb0..f940bd87e864b 100644
--- a/base/permuteddimsarray.jl
+++ b/base/permuteddimsarray.jl
@@ -17,7 +17,7 @@ immutable PermutedDimsArray{T,N,perm,iperm,AA<:AbstractArray} <: AbstractArray{T
 end
 
 function PermutedDimsArray{T,N}(data::AbstractArray{T,N}, perm)
-    length(perm) == N || throw(ArgumentError(string(p, " is not a valid permutation of dimensions 1:", N)))
+    length(perm) == N || throw(ArgumentError(string(perm, " is not a valid permutation of dimensions 1:", N)))
     iperm = invperm(perm)
     PermutedDimsArray{T,N,(perm...,),(iperm...,),typeof(data)}(data)
 end
diff --git a/test/arrayops.jl b/test/arrayops.jl
index 0d735436338c3..045f160ba7514 100644
--- a/test/arrayops.jl
+++ b/test/arrayops.jl
@@ -446,7 +446,12 @@ s = view(a,:,[1,2,4],[1,5])
 c = convert(Array, s)
 for p in ([1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], [3,2,1])
     @test permutedims(s, p) == permutedims(c, p)
+    @test Base.PermutedDimsArrays.PermutedDimsArray(s, p) == permutedims(c, p)
 end
+@test_throws ArgumentError permutedims(a, (1,1,1))
+@test_throws ArgumentError permutedims(s, (1,1,1))
+@test_throws ArgumentError Base.PermutedDimsArrays.PermutedDimsArray(a, (1,1,1))
+@test_throws ArgumentError Base.PermutedDimsArrays.PermutedDimsArray(s, (1,1,1))
 
 ## ipermutedims ##
 
@@ -1252,6 +1257,7 @@ end
 
 I1 = CartesianIndex((2,3,0))
 I2 = CartesianIndex((-1,5,2))
+@test -I1 == CartesianIndex((-2,-3,0))
 @test I1 + I2 == CartesianIndex((1,8,2))
 @test I2 + I1 == CartesianIndex((1,8,2))
 @test I1 - I2 == CartesianIndex((3,-2,-2))