Merge pull request #20468 from JuliaLang/aa/tuple-indexing

Remove multidimensional indexing of tuples

Author: pabloferz

base/multidimensional.jl

@@ -384,7 +384,7 @@ uncolon(inds::Tuple,      I::Tuple{Colon, Vararg{CI0}}) = Slice(OneTo(trailingsi
 
 ### From abstractarray.jl: Internal multidimensional indexing definitions ###
 getindex(x::Number, i::CartesianIndex{0}) = x
-getindex(t::Tuple, I...) = getindex(t, IteratorsMD.flatten(I)...)
+getindex(t::Tuple,  i::CartesianIndex{1}) = getindex(t, i.I[1])
 
 # These are not defined on directly on getindex to avoid
 # ambiguities for AbstractArray subtypes. See the note in abstractarray.jl

test/tuple.jl

@@ -231,3 +231,8 @@ end
 @test Tuple{Int,Vararg{Any}}(Float64[1,2,3]) === (1, 2.0, 3.0)
 @test Tuple(ones(5)) === (1.0,1.0,1.0,1.0,1.0)
 @test_throws MethodError convert(Tuple, ones(5))
+
+@testset "Multidimensional indexing (issue #20453)" begin
+    @test_throws MethodError (1,)[]
+    @test_throws MethodError (1,1,1)[1,1]
+end