Merge pull request #51 from ajkeller34/to_index_fix

to_index now throws an ArgumentException instead of an UndefVarError …

Author: mbauman

src/indexing.jl

@@ -107,7 +107,9 @@ end
     idxs = Expr[:(Colon()) for d = 1:N]
     names = axisnames(A)
     for i=1:length(dims)
-        idxs[dims[i]] == :(Colon()) || return :(error("multiple indices provided on axis ", $(names[dims[i]])))
+        idxs[dims[i]] == :(Colon()) ||
+            return :(throw(ArgumentError(string("multiple indices provided ",
+                "on axis ", $(string(names[dims[i]]))))))
         idxs[dims[i]] = :(I[$i].val)
     end
 

test/indexing.jl

@@ -136,3 +136,8 @@ axy = @inferred(A[Axis{:y}])
 @test isa(axy, Axis{:y})
 @test axy.val == 1:5
 @test_throws ArgumentError A[Axis{:z}]
+
+# Test for the expected exception type given repeated axes
+A = AxisArray(rand(2,2), :x, :y)
+@test_throws ArgumentError A[Axis{:x}(1), Axis{:x}(1)]
+@test_throws ArgumentError A[Axis{:y}(1), Axis{:y}(1)]