Re: [Haskell-cafe] implicit call stacks and calling function

On Mon, Mar 7, 2016, at 15:36, Evan Laforge wrote:

On Mon, Mar 7, 2016 at 11:46 AM, Eric Seidel wrote:

...

The reason we provide the name of the callee is that the standard format for a stack trace is callee+pos :)

I guess it depends how you look at it. I'm used to caller + pos, e.g. in Java:

java.lang.RuntimeException: blah blah at com...Caller.caller(Caller.java:494) at ...

Or python:

Traceback (most recent call last): File "t.py", line 2, in caller def caller(): callee() File "t.py", line 1, in callee def callee(): 1/0 ZeroDivisionError: integer division or modulo by zero

The haskell version (reversed to match python) would be like:

File "Caller.hs", line 6, in callee caller = callee 10 File "Caller.hs", line 9, in ?stack callee _n = mapM_ print (Stack.getCallStack ?stack)

To me this seems off by one, line 6 is in 'caller', not 'callee'.

Huh, you're quite right.. I remember checking python's formatting when I originally implemented the feature but I must have misread the stack..