Try to work around weird bug

Author: dlfivefifty

src/lazyconcat.jl

@@ -93,7 +93,8 @@ ndims(::Applied{<:Any,typeof(hcat)}) = 2
 size(f::Applied{<:Any,typeof(hcat)}) = (size(f.args[1],1), +(map(a -> size(a,2), f.args)...))
 Base.IndexStyle(::Type{<:Hcat}) where T = Base.IndexCartesian()
 
-function getindex(f::Hcat{T}, k::Integer, j::Integer) where T
+function hcat_getindex(f, k::Integer, j::Integer)
+    T = eltype(f)
     ξ = j
     for A in f.args
         n = size(A,2)
@@ -103,6 +104,9 @@ function getindex(f::Hcat{T}, k::Integer, j::Integer) where T
     throw(BoundsError(f, (k,j)))
 end
 
+getindex(f::Hcat, k::Integer, j::Integer) = hcat_getindex(f, k, j)
+getindex(f::Applied{DefaultArrayApplyStyle,typeof(hcat)}, k::Integer, j::Integer)= hcat_getindex(f, k, j)
+
 function setindex!(f::Hcat{T}, v, k::Integer, j::Integer) where T
     ξ = j
     for A in f.args

test/concattests.jl

@@ -137,6 +137,12 @@ import LazyArrays: MemoryLayout, DenseColumnMajor, PaddedLayout, materialize!, M
         @test vec(A) == vec(Matrix(A))
         @test A' == Matrix(A)'
         @test transpose(A) == transpose(Matrix(A))
+
+        @testset "getindex bug" begin
+            A = randn(3,3)
+            H = Hcat(A,A)
+            @test H[1,1] == applied(hcat,A,A)[1,1] == A[1,1]
+        end
     end
 
     @testset "Special pads" begin