_is_Field() ignores exceptions #14158
Description
#13370 changed
def bint _is_Field(x)
to
cpdef bint _is_Field(x)
without an except declaration.
For example, I have seen in between doctests:
sage -t --long -force_lib devel/sage/sage/graphs/generic_graph.py
Exception RuntimeError: RuntimeError("Gap produced error output\nError, Variable: 'is_field' must have a value\n\n executing is_field();",) in 'sage.rings.ring._is_Field' ignored
Component: coercion
Author: Jeroen Demeyer
Reviewer: David Roe
Merged: sage-5.8.beta2
Issue created by migration from https://trac.sagemath.org/ticket/14158