diff options
Diffstat (limited to 'CHANGES')
| -rw-r--r-- | CHANGES | 134 |
1 files changed, 123 insertions, 11 deletions
@@ -1,3 +1,108 @@ +Changes from V8.5beta2 to V8.5beta3 +=================================== + +Vernacular commands + +- New command "Redirect" to redirect the output of a command to a file. +- New command "Undelimit Scope" to remove the delimiter of a scope. +- New option "Strict Universe Declaration", set by default. It enforces the + declaration of all polymorphic universes appearing in a definition when + introducing it. +- New command "Show id" to show goal named id. + +Tactics + +- New flag "Regular Subst Tactic" which fixes "subst" in situations where + it failed to substitute all substitutable equations or failed to simplify + cycles, or accidentally unfolded local definitions (flag is off by default). +- New flag "Loose Hint Behavior" to handle hints loaded but not imported in a + special way. It accepts three distinct flags: + * "Lax", which is the default one, sets the old behavior, i.e. a non-imported + hint behaves the same as an imported one. + * "Warn" outputs a warning when a non-imported hint is used. Note that this is + an over-approximation, because a hint may be triggered by an eauto run that + will eventually fail and backtrack. + * "Strict" changes the behavior of an unloaded hint to the one of the fail + tactic, allowing to emulate the hopefully future import-scoped hint mechanism. +- New compatibility flag "Universal Lemma Under Conjunction" which + let tactics working under conjunctions apply sublemmas of the form + "forall A, ... -> A". +- New compatibility flag "Bracketing Last Introduction Pattern" which can be + set so that the last disjunctive-conjunctive introduction pattern given to + "intros" automatically complete the introduction of its subcomponents, as the + the disjunctive-conjunctive introduction patterns in non-terminal position + already do. +- Importing Program no longer overrides the "exists" tactic (potential source + of incompatibilities). +- Hints costs are now correctly taken into account (potential source of + incompatibilities). +- Documented the Hint Cut command that allows control of the + proof-search during typeclass resolution (see reference manual). + +API + +- Some functions from pretyping/typing.ml and their derivatives were potential + source of evarmap leaks, as they dropped their resulting evarmap. The + situation was clarified by renaming them according to a unsafe_* scheme. Their + sound variant is likewise renamed to their old name. The following renamings + were made. + * Typing.type_of -> unsafe_type_of + * Typing.e_type_of -> type_of + * A new e_type_of function that matches the e_ prefix policy + * Tacmach.pf_type_of -> pf_unsafe_type_of + * A new safe pf_type_of function. + All uses of unsafe_* functions should be eventually eliminated. + +Tools + +- Added an option -w to control the output of coqtop warnings. +- Configure now takes an optional -native-compiler (yes|no) flag replacing + -no-native-compiler. The new flag is set to no by default under Windows. +- Flag -no-native-compiler was removed and became the default for coqc. If + precompilation of files for native conversion test is desired, use + -native-compiler. +- The -compile command-line option now takes the full path of the considered + file, including the ".v" extension, and outputs a warning if such an extension + is lacking. +- The -require and -load-vernac-object command-line options now take a logical + path of a given library rather than a physical path, thus they behave like + Require [Import] path. + +Changes from V8.5beta1 to V8.5beta2 +=================================== + +Logic + +- The VM now supports inductive types with up to 8388851 non-constant + constructors and up to 8388607 constant ones. + +Tactics + +- A script using the admit tactic can no longer be concluded by either + Qed or Defined. In the first case, Admitted can be used instead. In + the second case, a subproof should be used. +- The easy tactic and the now tactical now have a more predictable + behavior, but they might now discharge some previously unsolved goals. + +Extraction + +- Definitions extracted to Haskell GHC should no longer randomly + segfault when some Coq types cannot be represented by Haskell types. +- Definitions can now be extracted to Json for post-processing. + +Tools + +- Option -I -as has been removed, and option -R -as has been + deprecated. In both cases, option -R can be used instead. +- coq_makefile now generates double-colon rules for rules such as clean. + +API + +- The interface of [change] has changed to take a [change_arg], which + can be built from a [constr] using [make_change_arg]. +- [pattern_of_constr] now returns a triplet including the cleaned-up + [evar_map], removing the evars that were turned into metas. + Changes from V8.4 to V8.5beta1 ============================== @@ -84,12 +189,13 @@ Specification Language break user notations using "$(", fixable by inserting a space or rewriting the notation). - Constructors in pattern-matching patterns now respect the same rules - regarding implicit arguments than in applicative position. The old + regarding implicit arguments as in applicative position. The old behavior can be recovered by the command "Set Asymmetric - Patterns". As a side effect, Much more notations can be used in - patterns. Considering that the pattern language is rich enough like - that, definitions are now always forbidden in patterns. (source of - incompatibilities for definitions that delta-reduce to a constructor) + Patterns". As a side effect, notations for constructors explicitly + mentioning non-implicit parameters can now be used in patterns. + Considering that the pattern language is already rich enough, binding + local definitions is however now forbidden in patterns (source of + incompatibilities for local definitions that delta-reduce to a constructor). - Type inference algorithm now granting opacity of constants. This might also affect behavior of tactics (source of incompatibilities, solvable by re-declaring transparent constants which were set opaque). @@ -110,10 +216,12 @@ Tactics during the execution of c, it can backtrack and try b instead of a. * New tactical (once a) removes all the backtracking points from a (i.e. it selects the first success of a). - * Tactic "constructor" is now fully backtracking, thus deprecating - the need of the undocumented "constructor <tac>" syntax which is - now equivalent to "[> once (constructor; tac) ..]". (potential - source of rare incompatibilities). + * Tactic "constructor" is now fully backtracking. In case of + incompatibilities (e.g. combinatoric explosion), the former + behavior of "constructor" can be retrieved by using instead + "[> once constructor ..]". Thanks to backtracking, undocumented + "constructor <tac>" syntax is now equivalent to + "[> once (constructor; tac) ..]". * New "multimatch" variant of "match" tactic which backtracks to new branches in case of a later failure. The "match" tactic is equivalent to "once multimatch". @@ -279,6 +387,10 @@ Tactics trace anymore. Use "Info 1 auto" instead. The same goes for "info_trivial". On the other hand "info_eauto" still works fine, while "Info 1 eauto" prints a trivial trace. +- When using a lemma of the prototypical form "forall A, {a:A & P a}", + "apply" and "apply in" do not instantiate anymore "A" with the + current goal and use "a" as the proof, as they were sometimes doing, + now considering that it is a too powerful decision. Program @@ -342,7 +454,7 @@ Interfaces - Many CoqIDE windows, including the query one, are now detachable to improve usability on multi screen work stations. -- Coqtop outputs highlighted syntax. Colors can be configured thanks +- Coqtop/coqc outputs highlighted syntax. Colors can be configured thanks to the COQ_COLORS environment variable, and their current state can be displayed with the -list-tags command line option. @@ -2076,7 +2188,7 @@ Changes from V7.3.1 to V7.4 Symbolic notations - Introduction of a notion of scope gathering notations in a consistent set; - a notation sets has been developped for nat, Z and R (undocumented) + a notation sets has been developed for nat, Z and R (undocumented) - New command "Notation" for declaring notations simultaneously for parsing and printing (see chap 10 of the reference manual) - Declarations with only implicit arguments now handled (e.g. the |