Moves the `@[coe]` attribute and associated elaborators/delaborators
from Std to Lean.
---------
Co-authored-by: Leonardo de Moura <leomoura@amazon.com>
The `push_cast` tactic in Std currently uses a copy-paste version of
`mkSimpContext` that allows overriding `getSimpTheorems`. However it has
been diverging from the version in Lean.
This is one way of generalizing `mkSimpContext` in Lean to allow what is
needed downstream., but I'm not at all set on this one. As far as I can
see there are no other tactics currently using this.
`push_cast` itself just replaces `getSimpTheorems` with
`pushCastExt.getTheorems`, where `pushCastExt` is a simp extension. If
there is another approach that suits that situation it would be fine.
I've tested that the change in this PR works downstream.
This is used in the "Try this:" widget machinery powering `simp?`.
There is a test file in Std, which I am not upstreaming at the same
time, as that relies on more code actions / #guard_msgs material. That
test file will still of course test things from Std, and later it can be
reunited with the code it is testing.
---------
Co-authored-by: Leonardo de Moura <leomoura@amazon.com>
These additional options are currently implemented in Std in a function
`Format.prettyExtra` (via `open private`), and used to implement the
`simp?` functionality.
This just adds the options to the core function.
This does not completely empty `Std.Lean.Name`, as working out how to
document the difference between `Name.isInternalDetail` and
`Name.isImplementationDetail` requires further thought.
The induction principle used by `induction` may have explicit parameters
that are
not motive, target or “real” alternatives (that have the `motive` as
conclusion), e.g. restrictions on the `motive` or other parameters.
Previously, `induction` would treat them as normal alternatives, and try
to re-introduce the automatically reverted hypotheses. But this only
works when the `motive` is actually the conclusion in the type of that
alternative.
We now pay attention to that, thread that information through, and only
revert when needed.
Fixes#3212.
Implements the pretty printer option `pp.numericTypes` for including a
type ascription for numeric literals. For example, `(2 : Nat)`, `(-2 :
Int)`, and `(-2 / 3 : Rat)`. This is useful for debugging how arithmetic
expressions have elaborated or have been otherwise transformed. For
example, with exponentiation is is helpful knowing whether it is `x ^ (2
: Nat)` or `x ^ (2 : Real)`. This is like the Lean 3 option
`pp.numeralTypes` but it has a wider notion of a numeric literal.
Also implements the pretty printer option `pp.natLit` for including the
`nat_lit` prefix for raw natural number literals.
Closes#3021
When we declare a `simp` set using `register_simp_attr`, we
automatically create `simproc` set. However, users may create `simp`
sets programmatically, and the associated `simproc` set may be missing
and vice-versa.
Before this commit, `Simproc`s were defined as `Expr -> SimpM (Option Step)`, where `Step` is inductively defined as follows:
```
inductive Step where
| visit : Result → Step
| done : Result → Step
```
Here, `Result` is a structure containing the resulting expression and a proof demonstrating its equality to the input. Notably, the proof is optional; in its absence, `simp` assumes reflexivity.
A simproc can:
- Fail by returning `none`, indicating its inapplicability. In this case, the next suitable simproc is attempted, along with other simp extensions.
- Succeed and invoke further simplifications using the `.visit`
constructor. This action returns control to the beginning of the
simplification loop.
- Succeed and indicate that the result should not undergo further
simplifications. However, I find the current approach unsatisfactory, as it does not align with the methodology employed in `Transform.lean`, where we have the type:
```
inductive TransformStep where
/-- Return expression without visiting any subexpressions. -/
| done (e : Expr)
/--
Visit expression (which should be different from current expression) instead.
The new expression `e` is passed to `pre` again.
-/
| visit (e : Expr)
/--
Continue transformation with the given expression (defaults to current expression).
For `pre`, this means visiting the children of the expression.
For `post`, this is equivalent to returning `done`. -/
| continue (e? : Option Expr := none)
```
This type makes it clearer what is going on. The new `Simp.Step` type is similar but use `Result` instead of `Expr` because we need a proof.
Modifies the structure instance elaborator to
1. Fill in missing fields from sources in strict left-to-right order. In
`{a, b with}`, sometimes the elaborator
would ignore `a` even if both `a` and `b` provided the same field,
depending on what subobject fields they had.
2. Use the sources, or subobjects of the sources, to fill in entire
subobjects of the target structure as much as possible.
Currently, a field cannot be filled directly by a source itself
resulting in the term being eta expanded.
This change avoids this unnecessary and surprisingly costly extra eta
expansion.
Adds two new tests to illustrate the performance benefit (one courtesy
@semorrison). These are currently failing on master and succeed on this
branch.
There is one additional test to exercise the changes to the elaboration
of structure instances.
Changes to make mathlib build are in leanprover-community/mathlib4#9843
Closes#2451
This combines a few platform-related changes:
* Add a ternary `platformIndependent` Lean configuration option to
assert whether Lake should assume Lean code is platform-independent. If
`true`, Lake will exclude platform-independent objects like external
libraries or dynlibs created through `precompileModules` from module
traces. If `false`, Lake will add the platform to module traces. If
`none` (the default), Lake will retain the current behavior (modules are
platform-dependent if and only if it depends on native objects).
* Use `System.Platform.target` from #3207 as the platform descriptor in
Lake for the configuration file trace, the cloud release archive, and as
the platform trace in Lean modules and native artifacts (e.g., object
files, and static and shared libraries).
* Do not add the platform descriptor into custom build archive names
(i.e., a user-set `buildArchive` configuration). This allows users to
create cross-platform / platform-independent archives via a name
override should they so desire.
Closes#2754.
