Looks like a code lowering bug. Can you post this to the github issue tracker?
On Wednesday, May 28, 2014, Adam Kapor <[email protected]> wrote: > I'm not sure what :(::) is supposed to do below, but not giving an error > at top level suggests to me that x[1] is "an expression computing a value." > In any case, I was surprised that += runs but doesn't `setindex!` x > > > julia> x=zeros(2) > 2-element Array{Float64,1}: > 0.0 > 0.0 > julia> x[1]::Float64 += 1. > 1.0 > julia> x > 2-element Array{Float64,1}: > 0.0 > 0.0 > julia> x[1]::Float64 = 1. > ERROR: syntax: invalid assignment location "x[1]" > > julia> myf(x) = x[1]::Float64+=1 > myf (generic function with 1 method) > julia> code_lowered(myf,(Array,)) > 1-element Array{Any,1}: > :($(Expr(:lambda, {:x}, > {{:#s36,:#s40},{{:x,:Any,0},{:#s36,:Any,18},{:#s40,:Float64,2}},{}}, > :(begin # none, line 1: > #s40 = top(typeassert)(top(convert)(Float64,getindex(x,1)),Float64) > #s36 = top(typeassert)(#s40,Float64) + 1 > #s40 = top(typeassert)(top(convert)(Float64,#s36),Float64) > return #s36 > end)))) > julia> myf_noassert(x) = x[1]+=1 > myf_noassert (generic function with 1 method) > julia> code_lowered(myf_noassert, (Array,)) > 1-element Array{Any,1}: > :($(Expr(:lambda, {:x}, {{:#s30},{{:x,:Any,0},{:#s30,:Any,18}},{}}, > :(begin # none, line 1: > #s30 = getindex(x,1) + 1 > setindex!(x,#s30,1) > return #s30 > end)))) > >
