wrong line number in traceback when multiple for loops

[nolta]

In the following function, there's a bug on line 10:

$ cat for_loop_bug.jl
function for_loop_bug()
    n = 100
    x = zeros(n)

    for j = 1:n
        x[j] = j    # line 6
    end

    for j = 1:n
        x[j+1] = j  # line 10
    end
end

However the traceback reports the error as being on line 6:

$ julia -L for_loop_bug.jl
julia> for_loop_bug()
in for_loop_bug: arrayset: index out of range
 in for_loop_bug at test.jl:6

[JeffBezanson]

Same cause as #922. I believe what happens is that with optimizations on, LLVM fuses the error-handling code for both array assignments, so when the error is thrown the instruction pointer always refers to the first assignment.