Doctest: bug with first call to ex.series()

[rwst]

In a fresh Sage:

sage: var('a b c c0 c1 c2 c3 c4 c5 c6 d i j m n p r k u x y z')
(a, b, c, c0, c1, c2, c3, c4, c5, c6, d, i, j, m, n, p, r, k, u, x, y, z)
sage: a.series(x)
1*x + Order(x^20)
sage: b.series(x)
(b)

sage: var('z0 z')
(z0, z)
sage: z0.series(x)
1*x + Order(x^20)
sage: z.series(x)
(z)

sage: var('z0 z')
(z0, z)
sage: z.series(x)
1*x + Order(x^20)
sage: z0.series(x)
(z0)

It seems to always affect the first call to series.

Depends on #23134

Component: symbolics

Author: Ralf Stephan

Branch/Commit: 92e6f44

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/22733

[rwst]

Dependencies: pynac-0.7.8

[rwst]

Upstream: Fixed upstream, in a later stable release.

[rwst]

comment:2

See also #23072

[rwst]

Changed dependencies from pynac-0.7.8 to #23134

[rwst]

Changed upstream from Fixed upstream, in a later stable release. to none

[tscrim]

comment:4

Just add a doctest, and I will set a positive review.

[rwst]

Branch: u/rws/bug_with_first_call_to_ex_series__

[rwst]

comment:6

Note: The failure is dependent on memory content and changes with every change of the comment part of the code. So, while this is fixed and the test always passes the test might not fail in versions that have the bug reintroduced.

---

New commits:

92e6f44

22733: Doctest: Bug with first call to ex.series()

[rwst]

Commit: 92e6f44

[rwst]

Author: Ralf Stephan

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

comment:7

It's hard to have tests that are guaranteed to fail if a bug was (re)introduced, so we will just have to do the best we can.

[vbraun]

Changed branch from u/rws/bug_with_first_call_to_ex_series__ to 92e6f44