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We'd like to cleanup the `proof_end` type so we can have a smaller
path in proof save. Note that the construction:
```
Goal Type.
⋮
Save id.
```
has to be handled by the STM in the same path as Defined (but with an
opaque flag), as `Save id` will alter the environment and cannot be
processed in parallel.
We thus try to simply such paths a bit, as complexity of `lemmas.ml`
seems like an issue these days. The form `Save Theorem id` doesn't
really seem used, and moreover we should really add a type of "Goal",
and unify syntax.
It is often the case that beginners try `Goal addnC n : n + 0 = n."
etc...
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Off by default.
+ small refactoring of emacs hacks in printer.ml.
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We want to print variables in vertical boxes as much as possible.
The criterion to distinguish "variable" from "hypothesis" is not
obvious. We chose this one but may change it in the future:
X:T is a variable if T is not of type Prop AND T is "simple" which
means T is either id or (t T1 .. Tn) Ti's are sort-typed (typicall
Ti:Type, but not Ti:nat).
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The addition to the test suite showcases the usage.
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let-ins
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Following @gasche idea, and the original intention of #402, we switch
the main parsing AST of Coq from `'a Loc.located` to `'a CAst.ast`
which is private and record-based.
This provides significantly clearer code for the AST, and is robust
wrt attributes.
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This completes the Loc.ghost removal, the idea is to gear the API
towards optional, but uniform, location handling.
We don't print <unknown> anymore in the case there is no location.
This is what the test suite expects.
The old printing logic for located items was a bit inconsistent as
it sometimes printed <unknown> and other times it printed nothing as
the caller checked for `is_ghost` upstream.
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Now it is a private field, locations are optional.
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This is the second patch, which is a bit more invasive. We reasoning
is similar to the previous patch.
Code is not as clean as it could as we would need to convert
`glob_constr` to located too, then a few parts could just map the
location.
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This is first of a series of patches, converting `constrexpr` pattern
data type from ad-hoc location handling to `Loc.located`.
Along Coq, we can find two different coding styles for handling
objects with location information: one style uses `'a Loc.located`,
whereas other data structures directly embed `Loc.t` in their
constructors.
Handling all located objects uniformly would be very convenient, and
would allow optimizing certain cases, in particular making located
smarter when there is no location information, as it is the case for
all terms coming from the kernel.
`git grep 'Loc.t \*'` gives an overview of the remaining work to do.
We've also added an experimental API for `located` to the `Loc`
module, `Loc.tag` should be used to add locations objects, making it
explicit in the code when a "located" object is created.
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Mostly documentation and making a couple of local flags, local.
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There were actually no syntax for it, and I'm still unsure what good
syntax to give to it, even more that it would be useful to have one.
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This is the good parts of PR #360.
IIUC, these vernacular were meant mostly for debugging and they are
not supposed to be of any use these days.
Back and join are still there not to break the testing infrastructure,
but some day they should go away.
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Also adding spaces around ":=" and ":" when printed as "(x : t := c)".
Example:
Check fun y => let x : True := I in fun z => z+y=0.
(* λ (y : nat) (x : True := I) (z : nat), z + y = 0
: nat → nat → Prop *)
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This is a patch fulfilling the relevant remark of Maxime that an
explicit information at the ML type level would be better than "cast
surgery" to carry the optional type of a let-in.
There are a very few semantic changes.
- a "(x:t:=c)" in a block of binders is now written in the more
standard way "(x:=c:t)"
- in notations, the type of a let-in is not displayed if not
explicitly asked so.
See discussion at PR #417 for more information.
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RawLocal -> CLocal
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This is a bit long, but it is to keep a symmetry with constr_expr.
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Previously, tags were associated to terminal styles, which doesn't make
sense on terminal-free pretty printing scenarios.
This commit moves tag interpretation to the toplevel terminal handling
module `Topfmt`.
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We also remove flushing operations `msg_with`, now the flushing
responsibility belong to the owner of the formatter.
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This is what has always been used, so it doesn't represent a functional
change.
This is just a preliminary patch, but many more possibilities could be
done wrt tags.
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Applications of it were not clear/unproven, it made printers more
complex (as they needed to be functors) and as it lacked examples it
confused some people.
The printers now tag unconditionally, it is up to the backends to
interpreted the tags.
Tagging (and indeed the notion of rich document) should be reworked in
a follow-up patch, so they are in sync, but this is a first step.
Tested, test-suite passes.
Notes:
- We remove the `Richprinter` module. It was only used in the
`annotate` IDE protocol call, its output was identical to the normal
printer (or even inconsistent if taggers were not kept manually in
sync).
- Note that Richpp didn't need a single change. In particular, its
main API entry point `Richpp.rich_pp` is not used by anyone.
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- Adding a better location in the "apply" on the fly pattern.
- Printing statement of lemma and of hypothesis.
Was suggested by discussion at wish report #5390.
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Incidentally, this fixes a printing bug in output/inference.v where the
displayed name of an evar was the wrong one because its type was not
evar-expanded enough.
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