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Proof General requires minor changes to make the diffs visible, but this code
shouldn't break the existing version of PG.
Diffs are computed for the hypotheses and conclusion of the first goal between
the old and new proofs. Strings are split into tokens using the Coq lexer,
then the list of tokens are diffed using the Myers algorithm. A fixup routine
(Pp_diff.shorten_diff_span) shortens the span of the diff result in some cases.
Diffs can be enabled with the Coq commmand "Set Diffs on|off|removed." or
"-diffs on|off|removed" on the OS command line. The "on" option shows only the
new item with added text, while "removed" shows each modified item twice--once
with the old value showing removed text and once with the new value showing
added text.
The highlights use 4 tags to specify the color and underline/strikeout.
These are "diffs.added", "diffs.removed", "diffs.added.bg" and "diffs.removed.bg".
The first two are for added or removed text; the last two are for
unmodified parts of a modified item.
Diffs that span multiple strings in the Pp are tagged with "start.diff.*" and
"end.diff.*", but only on the first and last strings of the span.
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a) not explicitly setting the default value and
b) not repeating attributes that are already set.
Example (omitting escape character):
Old: E : [92;49;22;23;24;27mev[39;49;22;23;24;27m [39;49;22;23;24;27mn[39;49;22;23;24;27m
New: E : [92mev[0m n
(92 is bright green, the other codes set default attributes).
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subtyping.
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Not sure if worth using in other places.
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This eliminates 3 uses of Obj from TCB.
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This eliminates 12 uses of Obj from TCB.
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to cmx.
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Still some discrepancies though. E.g.:
- some functions taking an equality as arguments have suffix `_f` but
not all;
- the functions possibly raising an error have still different kinds
of failure (Failure, Invalid_argument, Not_found or IndexOutOfRange,
and when in the first two cases, with no unique rules in the style
of the associated string - we thus avoid to document the exact
string used).
There are a few semantics changes:
- skipn_at_least now raises a `Failure` if its argument is negative;
- map3 raises an Invalid_argument "List.map3" rather than
Invalid_argument "map3" and similarly for map4
- internally, map3 and map4 are now tail-recursive (by uniformity);
- internally, split3 and combine3 are now tail-recursive (by uniformity);
- filter is now "smart" by default and smartfilter is deprecated;
- smartmap is now tail-recursive by default.
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Introduced in #7177
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This follows the model of smartmap and smartmap2.
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When comparing 2 irrelevant universes [u] and [v] we add a "weak
constraint" [UWeak(u,v)] to the UState. Then at minimization time a
weak constraint between unrelated universes where one is flexible
causes them to be unified.
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We reason up to order, and accept to match a final catch-all clauses
with any other clause.
This allows for instance to parse and print a notation of the form
"if t is S n then p else q".
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This is a purely functional datastructure isomorphic to usual lists, except
that it features a O(log n) lookup while preserving the O(1) cons operation.
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Up to this point the `lib` directory contained two different library
archives, `clib.cma` and `lib.cma`, which a rough splitting between
Coq-specific libraries and general-purpose ones.
We know split the directory in two, as to make the distinction clear:
- `clib`: contains libraries that are not Coq specific and implement
common data structures and programming patterns. These libraries
could be eventually replace with external dependencies and the rest
of the code base wouldn't notice much.
- `lib`: contains Coq-specific common libraries in widespread use
along the codebase, but that are not considered part of other
components. Examples are printing, error handling, or flags.
In some cases we have coupling due to utility files depending on Coq
specific flags, however this commit doesn't modify any files, but only
moves them around, further cleanup is welcome, as indeed a few files
in `lib` should likely be placed in `clib`.
Also note that `Deque` is not used ATM.
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