Make the pretty printer resilient to incomplete nametab (progress on #4363).

The nametab in which the error message is printed is not the one in
which the error message happens.

This reveals a weakness in the fix_exn code: the fix_exn function should
be pure, while in some cases (like this one) uses the global state (the
nametab) to print a term in a pretty way (the shortest non-ambiguous name
for constants).

This patch makes the externalization phase (used by term printing)
resilient to an incomplete nametab, so that printing a term in the
wrong nametab does not mask the original error.

0 files changed, 0 insertions, 0 deletions