Re: [External] : `max-specpdl-size' and `max-lisp-eval-depth'

[Hongyi Zhao <hongyi.zhao@gmail.com>]

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On Sun, Sep 26, 2021 at 11:53 AM Drew Adams <drew.adams@oracle.com> wrote:
>
> > I noticed the following messages triggered frequently by Emacs:
> >
> > File mode specification error: (error Variable binding depth exceeds
> > max-specpdl-size)
> > Emacs: nesting exceeds `max-lisp-eval-depth'
> >
> > Any hints/suggestions or rule of thumb to set these variables?
>
> You generally shouldn't need to change them.
> You're likely coding an infinite recursion, so
> the stack overflows.  Check your code - or
> narrow the problem down to some bit of code
> and post it here, if you can't see how/why
> you've cause an infinite recursion.

I set the following line in ~/.emacs.d/init.el:

(setq debug-on-error t)

Then a python file with the following content is opened in Emacs:

import matplotlib.pyplot as plt
from numpy import arange, p(*)i, sin
from sympy import Symbol, integrate

t = arange(0, 2*pi, .01)
plt.plot(sin(4*t), sin(5*t))

x = Symbol('x')
integrate(1/(1+x**3))

Now, I put point on `p' of `pi', denoted by * above. And hit
`M-.' which runs the command xref-find-definitions. The error shown in
the attachment will be triggered. When I hit the `M-.' for the second
time, it will be executed successfully.

Regards, HZ

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