diff options
| author | Matthieu Sozeau | 2017-04-25 21:54:31 +0200 |
|---|---|---|
| committer | Maxime Dénès | 2020-09-07 20:47:42 +0200 |
| commit | b6dabf6aa5b96cfa3c11038316399f0797d734ac (patch) | |
| tree | 0e97b6c66bba554833c47cec50d017820f72afe6 /doc | |
| parent | b972cc5195e941633319c1fa428a9801ac4ef9e2 (diff) | |
Refine test for unresolved evars: not reachable from initial evars
The test is refined to handle aliases: i.e. undefined evars coming from
restrictions and evar-evar unifications with an initial evar are not
considered fresh unresolved evars. To check this, we generalize the
restricted_evars set to an aliased_evars set in the evar map,
registering evars being solved by another evar due to restriction
or evar-evar unifications. This implements the proposal of PR #370
for testing the resolution status of evars independently of the evar-evar
orientation order.
This allows [apply] to refine an evar with a new one if it results from a
[clear] request or an evar-evar solution only, otherwise the new evar is
considered fresh and an error is raised.
Also fixes bugs #4095 and #4413.
Co-authored-by: Maxime Dénès <maxime.denes@inria.fr>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/changelog/02-specification-language/07825-rechable-from-evars.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/changelog/02-specification-language/07825-rechable-from-evars.rst b/doc/changelog/02-specification-language/07825-rechable-from-evars.rst new file mode 100644 index 0000000000..e57d5a7bc5 --- /dev/null +++ b/doc/changelog/02-specification-language/07825-rechable-from-evars.rst @@ -0,0 +1,9 @@ +- **Changed:** + In :tacn:`refine`, new existential variables unified with existing ones are no + longer considered as fresh. The behavior of :tacn:`simple refine` no longer depends on + the orientation of evar-evar unification problems, and new existential variables + are always turned into (unshelved) goals. This can break compatibility in + some cases (`#7825 <https://github.com/coq/coq/pull/7825>`_, by Matthieu + Sozeau, with help from Maxime Dénès, review by Pierre-Marie Pédrot and + Enrico Tassi, fixes `#4095 <https://github.com/coq/coq/issues/4095>`_ and + `#4413 <https://github.com/coq/coq/issues/4413>`_). |