Verus snapshot update (#116)

Automated verus snapshot update by GitHub Actions.

examples/verus-snapshot/source/vstd/arithmetic/power2.rs

@@ -172,4 +172,81 @@ pub proof fn lemma2_to64()
     ) by(compute_only);
 }
 
+/// Proof establishing the concrete values for all powers of 2 from 33 to 64.
+/// This lemma is separated from `lemma2_to64()` to avoid a stack overflow issue
+/// while executing ./tools/docs.sh.
+pub proof fn lemma2_to64_rest()
+    ensures
+        pow2(33) == 0x200000000,
+        pow2(34) == 0x400000000,
+        pow2(35) == 0x800000000,
+        pow2(36) == 0x1000000000,
+        pow2(37) == 0x2000000000,
+        pow2(38) == 0x4000000000,
+        pow2(39) == 0x8000000000,
+        pow2(40) == 0x10000000000,
+        pow2(41) == 0x20000000000,
+        pow2(42) == 0x40000000000,
+        pow2(43) == 0x80000000000,
+        pow2(44) == 0x100000000000,
+        pow2(45) == 0x200000000000,
+        pow2(46) == 0x400000000000,
+        pow2(47) == 0x800000000000,
+        pow2(48) == 0x1000000000000,
+        pow2(49) == 0x2000000000000,
+        pow2(50) == 0x4000000000000,
+        pow2(51) == 0x8000000000000,
+        pow2(52) == 0x10000000000000,
+        pow2(53) == 0x20000000000000,
+        pow2(54) == 0x40000000000000,
+        pow2(55) == 0x80000000000000,
+        pow2(56) == 0x100000000000000,
+        pow2(57) == 0x200000000000000,
+        pow2(58) == 0x400000000000000,
+        pow2(59) == 0x800000000000000,
+        pow2(60) == 0x1000000000000000,
+        pow2(61) == 0x2000000000000000,
+        pow2(62) == 0x4000000000000000,
+        pow2(63) == 0x8000000000000000,
+        pow2(64) == 0x10000000000000000,
+{
+    reveal(pow2);
+    reveal(pow);
+    #[verusfmt::skip]
+    assert(
+        pow2(33) == 0x200000000 &&
+        pow2(34) == 0x400000000 &&
+        pow2(35) == 0x800000000 &&
+        pow2(36) == 0x1000000000 &&
+        pow2(37) == 0x2000000000 &&
+        pow2(38) == 0x4000000000 &&
+        pow2(39) == 0x8000000000 &&
+        pow2(40) == 0x10000000000 &&
+        pow2(41) == 0x20000000000 &&
+        pow2(42) == 0x40000000000 &&
+        pow2(43) == 0x80000000000 &&
+        pow2(44) == 0x100000000000 &&
+        pow2(45) == 0x200000000000 &&
+        pow2(46) == 0x400000000000 &&
+        pow2(47) == 0x800000000000 &&
+        pow2(48) == 0x1000000000000 &&
+        pow2(49) == 0x2000000000000 &&
+        pow2(50) == 0x4000000000000 &&
+        pow2(51) == 0x8000000000000 &&
+        pow2(52) == 0x10000000000000 &&
+        pow2(53) == 0x20000000000000 &&
+        pow2(54) == 0x40000000000000 &&
+        pow2(55) == 0x80000000000000 &&
+        pow2(56) == 0x100000000000000 &&
+        pow2(57) == 0x200000000000000 &&
+        pow2(58) == 0x400000000000000 &&
+        pow2(59) == 0x800000000000000 &&
+        pow2(60) == 0x1000000000000000 &&
+        pow2(61) == 0x2000000000000000 &&
+        pow2(62) == 0x4000000000000000 &&
+        pow2(63) == 0x8000000000000000 &&
+        pow2(64) == 0x10000000000000000
+    ) by(compute_only);
+}
+
 } // verus!

examples/verus-snapshot/source/vstd/array.rs

@@ -107,13 +107,10 @@ pub fn array_as_slice<T, const N: usize>(ar: &[T; N]) -> (out: &[T])
     ar
 }
 
-#[verifier::external_fn_specification]
-pub fn ex_array_as_slice<T, const N: usize>(ar: &[T; N]) -> (out: &[T])
+pub assume_specification<T, const N: usize>[ <[T; N]>::as_slice ](ar: &[T; N]) -> (out: &[T])
     ensures
         ar@ == out@,
-{
-    ar.as_slice()
-}
+;
 
 pub spec fn spec_array_fill_for_copy_type<T: Copy, const N: usize>(t: T) -> (res: [T; N]);
 

examples/verus-snapshot/source/vstd/invariant.rs

@@ -509,9 +509,9 @@ pub use open_atomic_invariant_internal;
 /// ```
 /// error: possible invariant collision
 ///   |
-///   |   open_atomic_invariant!(&inv => id1 => {
+///   |   open_local_invariant!(&inv => id1 => {
 ///   |                           ^ this invariant
-///   |       open_atomic_invariant!(&inv => id2 => {
+///   |       open_local_invariant!(&inv => id2 => {
 ///   |                               ^ might be the same as this invariant
 ///   ...
 ///   |       }

examples/verus-snapshot/source/vstd/layout.rs

@@ -69,29 +69,23 @@ pub open spec fn align_of_as_usize<V>() -> usize
     align_of::<V>() as usize
 }
 
-#[verifier::external_fn_specification]
 #[verifier::when_used_as_spec(size_of_as_usize)]
-pub fn ex_size_of<V>() -> (u: usize)
+pub assume_specification<V>[ core::mem::size_of::<V> ]() -> (u: usize)
     ensures
         is_sized::<V>(),
         u as nat == size_of::<V>(),
     opens_invariants none
     no_unwind
-{
-    core::mem::size_of::<V>()
-}
+;
 
-#[verifier::external_fn_specification]
 #[verifier::when_used_as_spec(align_of_as_usize)]
-pub fn ex_align_of<V>() -> (u: usize)
+pub assume_specification<V>[ core::mem::align_of::<V> ]() -> (u: usize)
     ensures
         is_sized::<V>(),
         u as nat == align_of::<V>(),
     opens_invariants none
     no_unwind
-{
-    core::mem::align_of::<V>()
-}
+;
 
 // This is marked as exec, again, in order to force `V` to be a real exec type.
 // Of course, it's still a no-op.

examples/verus-snapshot/source/vstd/map.rs

@@ -3,7 +3,6 @@
 use super::pervasive::*;
 use super::prelude::*;
 use super::set::*;
-use core::marker;
 
 verus! {
 
@@ -27,17 +26,18 @@ verus! {
 ///  * By manipulating an existing map with [`Map::insert`] or [`Map::remove`].
 ///
 /// To prove that two maps are equal, it is usually easiest to use the extensionality operator `=~=`.
-#[verifier::external_body]
 #[verifier::ext_equal]
 #[verifier::reject_recursive_types(K)]
 #[verifier::accept_recursive_types(V)]
 pub tracked struct Map<K, V> {
-    dummy: marker::PhantomData<(K, V)>,
+    mapping: spec_fn(K) -> Option<V>,
 }
 
 impl<K, V> Map<K, V> {
     /// An empty map.
-    pub spec fn empty() -> Map<K, V>;
+    pub closed spec fn empty() -> Map<K, V> {
+        Map { mapping: |k| None }
+    }
 
     /// Gives a `Map<K, V>` whose domain contains every key, and maps each key
     /// to the value given by `fv`.
@@ -52,14 +52,18 @@ impl<K, V> Map<K, V> {
     }
 
     /// The domain of the map as a set.
-    pub spec fn dom(self) -> Set<K>;
+    pub closed spec fn dom(self) -> Set<K> {
+        Set::new(|k| (self.mapping)(k) is Some)
+    }
 
     /// Gets the value that the given key `key` maps to.
     /// For keys not in the domain, the result is meaningless and arbitrary.
-    pub spec fn index(self, key: K) -> V
+    pub closed spec fn index(self, key: K) -> V
         recommends
             self.dom().contains(key),
-    ;
+    {
+        (self.mapping)(key)->Some_0
+    }
 
     /// `[]` operator, synonymous with `index`
     #[verifier::inline]
@@ -74,32 +78,36 @@ impl<K, V> Map<K, V> {
     ///
     /// If the key is already present from the map, then its existing value is overwritten
     /// by the new value.
-    pub spec fn insert(self, key: K, value: V) -> Map<K, V>;
+    pub closed spec fn insert(self, key: K, value: V) -> Map<K, V> {
+        Map {
+            mapping: |k|
+                if k == key {
+                    Some(value)
+                } else {
+                    (self.mapping)(k)
+                },
+        }
+    }
 
     /// Removes the given key and its associated value from the map.
     ///
     /// If the key is already absent from the map, then the map is left unchanged.
-    pub spec fn remove(self, key: K) -> Map<K, V>;
+    pub closed spec fn remove(self, key: K) -> Map<K, V> {
+        Map {
+            mapping: |k|
+                if k == key {
+                    None
+                } else {
+                    (self.mapping)(k)
+                },
+        }
+    }
 
     /// Returns the number of key-value pairs in the map
     pub open spec fn len(self) -> nat {
         self.dom().len()
     }
 
-    /// DEPRECATED: use =~= or =~~= instead.
-    /// Returns true if the two maps are pointwise equal, i.e.,
-    /// they have the same domains and the corresponding values are equal
-    /// for each key. This is equivalent to the maps being actually equal
-    /// by [`axiom_map_ext_equal`].
-    ///
-    /// To prove that two maps are equal via extensionality, it may be easier
-    /// to use the general-purpose `=~=` or `=~~=` or
-    /// to use the [`assert_maps_equal!`] macro, rather than using `.ext_equal` directly.
-    #[cfg_attr(not(verus_verify_core), deprecated = "use =~= or =~~= instead")]
-    pub open spec fn ext_equal(self, m2: Map<K, V>) -> bool {
-        self =~= m2
-    }
-
     #[verifier::external_body]
     pub proof fn tracked_empty() -> (tracked out_v: Self)
         ensures
@@ -222,7 +230,9 @@ pub broadcast proof fn axiom_map_empty<K, V>()
     ensures
         #[trigger] Map::<K, V>::empty().dom() == Set::<K>::empty(),
 {
-    admit();
+    broadcast use super::set::group_set_axioms;
+
+    assert(Set::new(|k: K| (|k| None::<V>)(k) is Some) == Set::<K>::empty());
 }
 
 /// The domain of a map after inserting a key-value pair is equivalent to inserting the key into
@@ -231,26 +241,25 @@ pub broadcast proof fn axiom_map_insert_domain<K, V>(m: Map<K, V>, key: K, value
     ensures
         #[trigger] m.insert(key, value).dom() == m.dom().insert(key),
 {
-    admit();
+    broadcast use super::set::group_set_axioms;
+
+    assert(m.insert(key, value).dom() =~= m.dom().insert(key));
 }
 
 /// Inserting `value` at `key` in `m` results in a map that maps `key` to `value`
 pub broadcast proof fn axiom_map_insert_same<K, V>(m: Map<K, V>, key: K, value: V)
     ensures
         #[trigger] m.insert(key, value)[key] == value,
 {
-    admit();
 }
 
 /// Inserting `value` at `key2` does not change the value mapped to by any other keys in `m`
 pub broadcast proof fn axiom_map_insert_different<K, V>(m: Map<K, V>, key1: K, key2: K, value: V)
     requires
-        m.dom().contains(key1),
         key1 != key2,
     ensures
         #[trigger] m.insert(key2, value)[key1] == m[key1],
 {
-    admit();
 }
 
 /// The domain of a map after removing a key-value pair is equivalent to removing the key from
@@ -259,19 +268,19 @@ pub broadcast proof fn axiom_map_remove_domain<K, V>(m: Map<K, V>, key: K)
     ensures
         #[trigger] m.remove(key).dom() == m.dom().remove(key),
 {
-    admit();
+    broadcast use super::set::group_set_axioms;
+
+    assert(m.remove(key).dom() =~= m.dom().remove(key));
 }
 
 /// Removing a key-value pair from a map does not change the value mapped to by
 /// any other keys in the map.
 pub broadcast proof fn axiom_map_remove_different<K, V>(m: Map<K, V>, key1: K, key2: K)
     requires
-        m.dom().contains(key1),
         key1 != key2,
     ensures
         #[trigger] m.remove(key2)[key1] == m[key1],
 {
-    admit();
 }
 
 /// Two maps are equivalent if their domains are equivalent and every key in their domains map to the same value.
@@ -282,7 +291,26 @@ pub broadcast proof fn axiom_map_ext_equal<K, V>(m1: Map<K, V>, m2: Map<K, V>)
             &&& forall|k: K| #![auto] m1.dom().contains(k) ==> m1[k] == m2[k]
         },
 {
-    admit();
+    broadcast use super::set::group_set_axioms;
+
+    if m1 =~= m2 {
+        assert(m1.dom() =~= m2.dom());
+        assert(forall|k: K| #![auto] m1.dom().contains(k) ==> m1[k] == m2[k]);
+    }
+    if ({
+        &&& m1.dom() =~= m2.dom()
+        &&& forall|k: K| #![auto] m1.dom().contains(k) ==> m1[k] == m2[k]
+    }) {
+        if m1.mapping != m2.mapping {
+            assert(exists|k| #[trigger] (m1.mapping)(k) != (m2.mapping)(k));
+            let k = choose|k| #[trigger] (m1.mapping)(k) != (m2.mapping)(k);
+            if m1.dom().contains(k) {
+                assert(m1[k] == m2[k]);
+            }
+            assert(false);
+        }
+        assert(m1 =~= m2);
+    }
 }
 
 pub broadcast proof fn axiom_map_ext_equal_deep<K, V>(m1: Map<K, V>, m2: Map<K, V>)
@@ -292,7 +320,7 @@ pub broadcast proof fn axiom_map_ext_equal_deep<K, V>(m1: Map<K, V>, m2: Map<K,
             &&& forall|k: K| #![auto] m1.dom().contains(k) ==> m1[k] =~~= m2[k]
         },
 {
-    admit();
+    axiom_map_ext_equal(m1, m2);
 }
 
 pub broadcast group group_map_axioms {