Exception causes assignment on previous line to be ignored

[danluu]

Here are two functions I'd expect to behave identically:

function wheee0()
    i = 0
    while true
        try
            if i == 0
                print(".")
            end
            i += 1
            peakflops(1954784290346684782)
        catch
        end
    end
end

function wheee1()
    i = 0
    while true
        try
            i += 1
            if i == 1
                print(".")
            end
            peakflops(1954784290346684782)
        catch
        end
    end
end

When I run wheee0(), i never increments and my screen gets filled with .. When I run wheee1(), I get a single ., as expected.

Additionally, accessing i inside the while loop, (either inside the catch block of after the entire try/catch expression) causes wheee0 to behave as expected. Accessing i after the while loop has no effect.

I ran into this while trying to create a small, reproducible, test case for some strange behavior on a bad peakflops call, but replacing peakflops with something else that throws an exception (or just throwing an exception with throw) doesn't seem to change the behavior here.

[JeffBezanson]

cc @JuliaBackports

[ivarne]

Backported in 0cdc92e