Interactively adding a breakpoint may not work

[timholy]

I set @debug begin...end around base/pkg.jl's "_resolve" function, as well as some other functions. With these additions, line 194 corresponds to if has(have,pkg).

After stepping through the early parts of the function, I got to a place where I wanted to set a breakpoint on each iteration of that loop. I got this:

debug:194> add($bp, $n)
no method add(Set{Node{T}},Node{ExValue})

debug:194> $bp
Set{Node{T}}()

debug:194> $n
^CNode(ExValue(:if,

debug:194> s

at /home/tim/src/julia/base/pkg.jl:195

Executing $n caused the prompt to hang, so I hit Ctrl-C.

[toivoh]

Ah, the trouble with add must be because Pkg.add shadows Base.add. You would probably have been able to do it with Base.add($bp, $n) in this case. But there should of course be a way that always works. I'll make $(add(bp,n)) and $add($bp, $n) work consistently.

The trouble with printing $n might stem from the fact that the decorated AST is circular. I though I had fixed that, but I'll take a look to see that nodes are printable.

[toivoh]

Ok, I have really no idea why showing$n caused a hang. Please file it as a separate issue if you can reproduce it.

[timholy]

Thanks for the quick fixes and improvements!