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common;use common::*;
// 1 arg closures
// REVIEW: exec closures implicitly rely on vstdtest_verify_one_file_with_options! { #[test] basic_test ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| -> (z: u64) requires y == 2 ensures z == 2 { y };
assert(f.requires((2,))); assert(!f.ensures((2,),3));
let t = f(2); assert(t == 2); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_ensures_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| -> (z: u64) requires y == 2 ensures z == 3 // FAILS { y }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_ensures_fail_return_stmt ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| -> (z: u64) requires y == 2 ensures z == 3 // FAILS { return y; }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_assert_requires_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| requires y == 2 { };
assert(f.requires((3,))); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_assert_not_ensures_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| -> (z: u64) requires y == 2 ensures z == 3 { y + 1 };
assert(!f.ensures((2,), 3)); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_call_requires_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| requires y == 2 { };
f(3); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_call_ensures_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| -> (z: u64) requires y == 2 ensures z == 2 { y };
let z = f(2); assert(z == 3); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_loop_forever ["vstd", "exec_allows_no_decreases_clause"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |y: u64| requires y == 2 ensures false { loop { } };
let z = f(2); assert(false); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_requires_is_about_external_var ["vstd", "exec_allows_no_decreases_clause"] => verus_code! { use vstd::prelude::*;
fn testfn(b: bool) { let f = |y: u64| requires y == 2 ensures b { if !b { loop { } } };
let z = f(2); assert(b); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_in_closure_parameter ["vstd"] => verus_code! { fn test_reference() { let is_seven = |&x: &u8| -> (result: bool) ensures result == (x == 7) { x == 7 }; let x = 7u8; let result = is_seven(&x); assert(result); }
fn test_tuple() { let are_equal = |(x, y): (u8, u8)| -> (result: bool) ensures result == (x == y) { x == y }; let result = are_equal((7, 7)); assert(result); }
struct Pair1 { x: u8, y: u8 } fn test_struct() { let are_equal = |Pair1 { x, y }: Pair1| -> (result: bool) ensures result == (x == y) { x == y }; let result = are_equal(Pair1 { x: 7, y: 7 }); assert(result); }
struct Pair2(u8, u8); fn test_tuple_struct() { let are_equal = |Pair2(x, y): Pair2| -> (result: bool) ensures result == (x == y) { x == y }; let result = are_equal(Pair2(7, 7)); assert(result); }
fn testfn() { let is_seven = |ref x: u8| -> (result: bool) ensures result == (*x == 7) { *x == 7 }; let result = is_seven(7u8); assert(result); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_implicit_mut_ref_unsupported ["vstd"] => verus_code! { fn test() { let y = |(x, y): &mut (u64, u64)| { }; } } => Err(err) => assert_vir_error_msg(err, "`ref mut` bindings in parameters")}
test_verify_one_file_with_options! { #[test] test_pattern_explicit_mut_ref_unsupported ["vstd"] => verus_code! { fn test() { let f = |ref mut x: u64| {}; } } => Err(err) => assert_vir_error_msg(err, "`ref mut` bindings in parameters")}
test_verify_one_file_with_options! { #[test] test_pattern_nested_mut_ref_unsupported ["vstd"] => verus_code! { struct Pair { values: (u64, u64) }
fn test() { let f = |Pair { values: (x, ref mut y) }: Pair| {}; } } => Err(err) => assert_vir_error_msg(err, "`ref mut` bindings in parameters")}
test_verify_one_file_with_options! { #[test] test_pattern_call_requires_fail ["vstd"] => verus_code! { fn test() { let f = |(x, y): (u8, u8)| requires x == y {};
f((7, 7)); f((7, 8)); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_pattern_ensures_fail ["vstd"] => verus_code! { fn test() { let f = |(x, y): (u8, u8)| -> (result: bool) ensures result == (x == y) // FAILS { x != y }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_pattern_explicit_mut_deref ["vstd"] => verus_code! { fn test() { let f = |&mut (x, y): &mut (u64, u64)| -> (result: u64) requires x == y ensures result == x { y }; let mut pair = (7, 7); let result = f(&mut pair); assert(result == 7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_explicit_mut_deref_requires_fail ["vstd"] => verus_code! { fn test() { let f = |&mut (x, y): &mut (u64, u64)| requires x == y {}; let mut pair = (7, 8); f(&mut pair); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_pattern_implicit_shared_ref ["vstd"] => verus_code! { fn test() { let f = |(x, y): &(u64, u64)| -> (result: u64) requires *x == *y ensures result == *x { *y }; let pair = (7, 7); let result = f(&pair); assert(result == 7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_implicit_shared_ref_requires_fail ["vstd"] => verus_code! { fn test() { let f = |(x, y): &(u64, u64)| requires *x == *y {}; let pair = (7, 8); f(&pair); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_pattern_at_binding ["vstd"] => verus_code! { fn test() { let f = |whole @ (x, y): (u64, u64)| -> (result: u64) requires whole.0 == y ensures result == x, result == whole.1 { assert(whole.0 == x); y }; let result = f((7, 7)); assert(result == 7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_at_binding_ensures_fail ["vstd"] => verus_code! { fn test() { let f = |whole @ (x, y): (u64, u64)| -> (result: u64) requires whole.0 != y ensures result == x // FAILS { whole.1 }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_pattern_nested_rest ["vstd"] => verus_code! { struct Packet { values: (u64, u64, u64), ignored: u64 } fn test() { let f = |Packet { values: (x, .., z), .. }: Packet| -> (result: u64) requires x < z ensures result == z { z }; let result = f(Packet { values: (3, 5, 7), ignored: 9 }); assert(result == 7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_nested_rest_requires_fail ["vstd"] => verus_code! { struct Packet { values: (u64, u64, u64), ignored: u64 } fn test() { let f = |Packet { values: (x, .., z), .. }: Packet| requires x < z {}; f(Packet { values: (7, 9, 3), ignored: 0 }); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_pattern_non_copy ["vstd"] => verus_code! { struct Item { value: u64 } struct Pair { first: Item, second: Item } fn test() { let f = |Pair { first, second }: Pair| -> (result: Item) requires first.value == second.value ensures result.value == first.value { second }; let result = f(Pair { first: Item { value: 7 }, second: Item { value: 7 } }); assert(result.value == 7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_pattern_non_copy_ensures_fail ["vstd"] => verus_code! { struct Item { value: u64 } struct Pair { first: Item, second: Item } fn test() { let f = |Pair { first, second }: Pair| -> (result: Item) requires first.value != second.value ensures result.value == first.value // FAILS { second }; } } => Err(err) => assert_one_fails(err)}
// 2 arg closures
test_verify_one_file_with_options! { #[test] basic_test_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| -> (z: u64) requires x == y ensures z == x { y };
assert(f.requires((5,5))); assert(!f.ensures((2,2),3));
let t = f(8, 8); assert(t == 8); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_ensures_fail_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| -> (z: u64) requires x == y ensures z == x // FAILS { 0 as u64 }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_ensures_fail_return_stmt_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| -> (z: u64) requires y == 2 ensures z == 3 // FAILS { return 0 as u64; }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_assert_requires_fail_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| requires y == x { };
assert(f.requires((3,4))); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_assert_not_ensures_fail_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| -> (z: u64) requires x == y ensures z == x { y };
assert(!f.ensures((2,2), 2)); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_call_requires_fail_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| requires x == y { };
f(3, 4); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_call_ensures_fail_2_args ["vstd"] => verus_code! { use vstd::prelude::*;
fn testfn() { let f = |x: u64, y: u64| -> (z: u64) requires x == y ensures z == x { y };
let z = f(10, 10); assert(z == 11); // FAILS } } => Err(err) => assert_one_fails(err)}
// 0 arg closures
test_verify_one_file_with_options! { #[test] basic_test_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
// TODO requires/ensures need to be spec-erased uninterp spec fn goo() -> bool;
fn testfn() { let f = || ensures goo() { assume(goo()); };
assert(f.requires(())); assert(f.ensures((),()) ==> goo());
let t = f(); assert(goo()); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_ensures_fail_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
spec fn goo() -> bool;
fn testfn() { let f = || ensures goo() // FAILS { }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_ensures_fail_return_stmt_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
spec fn goo() -> bool;
fn testfn() { let f = || ensures goo() // FAILS { return; }; } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_assert_requires_fail_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
spec fn goo() -> bool;
fn testfn() { let f = || requires goo() { };
assert(f.requires(())); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_assert_not_ensures_fail_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
spec fn goo() -> bool;
fn testfn() { let f = || ensures goo() { assume(goo()); };
assert(!f.ensures((), ())); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_call_requires_fail_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
spec fn goo() -> bool;
fn testfn() { let f = || requires goo() { };
f(); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_call_ensures_fail_0_args ["vstd"] => verus_code! { use vstd::prelude::*;
spec fn goo() -> bool;
fn testfn() { let f = || ensures goo() { assume(goo()); };
let z = f(); assert(false); // FAILS } } => Err(err) => assert_one_fails(err)}
// misc tests
test_verify_one_file_with_options! { #[test] pass_closure_via_typ_param ["vstd"] => verus_code! { use vstd::prelude::*;
fn f1<T: Fn(u64) -> u64>(t: T) requires forall|x: u64| 0 <= x < 5 ==> t.requires((x,)), forall|x: u64, y: u64| t.ensures((x,), y) ==> y == x + 1, { let ret = t(3); assert(ret == 4); }
fn f2() { let t = |a: u64| -> (ret: u64) requires 0 <= a < 5 ensures ret == a + 1 { a + 1 };
f1(t); } } => Ok(())}
test_verify_one_file_with_options! { #[test] pass_closure_via_typ_param_fn_once ["vstd"] => verus_code! { use vstd::prelude::*;
fn f1<T: FnOnce(u64) -> u64>(t: T) requires forall|x: u64| 0 <= x < 5 ==> t.requires((x,)), forall|x: u64, y: u64| t.ensures((x,), y) ==> y == x + 1, { let ret = t(3); assert(ret == 4); }
fn f2() { let t = |a: u64| -> (ret: u64) requires 0 <= a < 5 ensures ret == a + 1 { a + 1 };
f1(t); } } => Ok(())}
test_verify_one_file_with_options! { #[test] pass_closure_via_typ_param_fn_mut ["vstd"] => verus_code! { use vstd::prelude::*;
fn f1<T: FnMut(u64) -> u64>(t: T) requires forall|x: u64| 0 <= x < 5 ==> t.requires((x,)), forall|x: u64, y: u64| t.ensures((x,), y) ==> y == x + 1, { let mut t = t; let ret = t(3); assert(ret == 4);
let ret = t(1); assert(ret == 2); }
fn f2() { let t = |a: u64| -> (ret: u64) requires 0 <= a < 5 ensures ret == a + 1 { a + 1 };
f1(t); } } => Ok(())}
test_verify_one_file_with_options! { #[test] construct_exec_closure_in_spec_code_fail ["vstd"] => (code_str! { use vstd::prelude::*;
// This test needs to be outside the verus macro so that it doesn't // automatically add the closure_to_fn_spec wrapper #[verifier::spec] fn foo() -> bool { let f = || true; f() } }).to_string() => Err(err) => assert_vir_error_msg(err, "closure in ghost code must be marked as a `spec_fn`")}
test_verify_one_file_with_options! { #[test] call_exec_closure_in_spec_code_fail ["vstd"] => verus_code! { use vstd::prelude::*;
#[verifier::spec] fn foo<F: Fn(u64) -> u64>(f: F) -> u64 { f(5) } } => Err(err) => assert_vir_error_msg(err, "to call a non-static function in ghost code, it must be a `spec_fn`")}
test_verify_one_file_with_options! { #[test] construct_fn_spec_in_exec_code_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo() { let t = closure_to_fn_spec(|x: u64| x); } } => Err(err) => assert_vir_error_msg(err, "cannot use `verus_builtin::closure_to_fn_spec` in executable context")}
test_verify_one_file_with_options! { #[test] call_fn_spec_in_exec_code_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo(t: spec_fn(u64) -> u64) { let x = t(5); } } => Err(err) => assert_vir_error_msg(err, "cannot call spec function from exec mode")}
test_verify_one_file_with_options! { #[test] call_closure_requires_in_exec_code_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo() { let f = |x: u64| { x };
let m = call_requires(f, (5, )); } } => Err(err) => assert_vir_error_msg(err, "cannot use `verus_builtin::call_requires` in executable context")}
test_verify_one_file_with_options! { #[test] call_closure_ensures_in_exec_code_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo() { let f = |x: u64| { x };
let m = call_ensures(f, (5, ), 7); } } => Err(err) => assert_vir_error_msg(err, "cannot use `verus_builtin::call_ensures` in executable context")}
test_verify_one_file_with_options! { #[test] ens_type_doesnt_match ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo() { let f = |x: u64| { ensures(|b: bool| b); x }; } } => Err(err) => assert_vir_error_msg(err, "return type given in `ensures` clause should match")}
test_verify_one_file_with_options! { #[test] mode_check_requires ["vstd"] => verus_code! { use vstd::prelude::*;
fn some_exec_fn() -> bool { true }
fn foo() { let f = |x: u64| requires some_exec_fn() { }; } } => Err(err) => assert_vir_error_msg(err, "cannot call function `test_crate::some_exec_fn` with mode exec")}
test_verify_one_file_with_options! { #[test] mode_check_ensures ["vstd"] => verus_code! { use vstd::prelude::*;
fn some_exec_fn() -> bool { true }
fn foo() { let f = |x: u64| ensures some_exec_fn() { }; } } => Err(err) => assert_vir_error_msg(err, "cannot call function `test_crate::some_exec_fn` with mode exec")}
test_verify_one_file_with_options! { #[test] mode_check_return_value ["vstd"] => verus_code! { use vstd::prelude::*;
#[verifier::spec] fn some_spec_fn() -> bool { true }
fn foo() { let f = |x: u64| { some_spec_fn() }; } } => Err(err) => assert_vir_error_msg(err, "cannot call function `test_crate::some_spec_fn` with mode spec")}
test_verify_one_file_with_options! { #[test] mode_check_return_stmt ["vstd"] => verus_code! { use vstd::prelude::*;
#[verifier::spec] fn some_spec_fn() -> bool { true }
fn foo() { let f = |x: u64| { return some_spec_fn(); }; } } => Err(err) => assert_vir_error_msg(err, "cannot call function `test_crate::some_spec_fn` with mode spec")}
test_verify_one_file_with_options! { #[test] while_loop_inside_closure ["vstd", "exec_allows_no_decreases_clause"] => verus_code! { use vstd::prelude::*;
fn foo() -> (i: u64) ensures i == 0 { let f = || -> (j: u64) ensures j == 1 { loop { return 1 as u64; } };
assert(false); // FAILS
0 } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_calls_in_assignments_to_mut_var ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo(b: bool) { let f = |i: u64| -> (j: u64) ensures j == i { i };
let mut r = f(5);
assert(r == 5);
if b { r = f(7);
assert(r == 7); }
assert(r == 5 || r == 7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_calls_in_assignments_to_mut_var_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo(b: bool) { let f = |i: u64| -> (j: u64) ensures j == i { i };
let mut r = f(5);
assert(r == 5);
if b { r = f(7);
assert(r == 7); }
assert(r == 5 || r == 7); assert(false); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] test_calls_as_sub_expression ["vstd"] => verus_code! { use vstd::prelude::*;
fn some_call(i: u64) requires i == 20 { }
fn foo(b: bool) { let f = |i: u64| -> (j: u64) ensures j == i { i };
some_call(f(20)); } } => Ok(())}
test_verify_one_file_with_options! { #[test] test_calls_as_sub_expression_fail ["vstd"] => verus_code! { use vstd::prelude::*;
fn some_call(i: u64) requires i == 21 { }
fn foo(b: bool) { let f = |i: u64| -> (j: u64) ensures j == i { i };
some_call(f(20)); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] old_works_for_params_from_outside_the_closure ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo(b: &mut bool) requires *old(b) == true, { *b = false;
let f = |i: u64| { assert(*b == false); assert(*old(b) == true); }; } } => Ok(())}
test_verify_one_file_with_options! { #[test] old_for_closure_param_error ["vstd"] => verus_code! { use vstd::prelude::*;
fn foo() { let g = |y: u64| requires old(y) == 6 { y }; } } => Err(err) => assert_rust_error_msg(err, "mismatched types")}
test_verify_one_file_with_options! { #[ignore] #[test] callee_is_computed_expression ["vstd"] => verus_code! { use vstd::prelude::*;
// Rust allows this because it can cast both closures to 'fn(u64) -> u64' // However Verus doesn't support this type right now
fn foo(b: bool) { let f = |i: u64| { assert(i == 0 || i == 1); i }; let g = |i: u64| { assert(i == 4 || i == 1); i }; (if b { f } else { g })(0); }
fn foo2(b: bool) { let f = |i: u64| { assert(i == 0 || i == 1); i }; let g = |i: u64| { assert(i == 4 || i == 1); i }; (if b { f } else { g })(1); // FAILS }
fn foo3(b: bool) { let f = |i: u64| { assert(i == 0 || i == 1); i }; let g = |i: u64| { assert(i == 4 || i == 1); i }; (if b { f } else { g })(4); // FAILS } } => Err(e) => assert_fails(e, 2)}
test_verify_one_file_with_options! { #[test] callee_is_computed_expression_with_loop ["vstd", "exec_allows_no_decreases_clause"] => verus_code! { use vstd::prelude::*;
use vstd::{pervasive::*, prelude::*};
fn foo(b: bool) { let mut i: u64 = 0;
// This test is written really awkwardly for the sake of getting // these two variables, fun1 and fun2, to have the same closure type
let mut fun1 = Option::None; let mut fun2 = Option::None;
while ({ // In partictular, we need to do gymnastics to make the closure declaration // appear first so that typechecking works. // That's why we have all this junk in the condition of the while loop.
let f = move |j: u64| requires j == 20 || j == i { j }; if i == 0 { fun1 = Option::Some(f); } else if i == 1 { fun2 = Option::Some(f); }
i = i + 1;
i < 2 }) invariant i == 0 || i == 1 || i == 2, i >= 1 ==> fun1 is Some && (forall|x: u64| (x == 20 || x == 0 ==> fun1->0.requires((x,)))), i >= 2 ==> fun2 is Some && (forall|x: u64| (x == 20 || x == 1 ==> fun2->0.requires((x,)))), { }
assert(i == 2 || i == 3);
let fun1 = match fun1 { Option::Some(fun1) => fun1, Option::None => unreached() }; let fun2 = match fun2 { Option::Some(fun1) => fun1, Option::None => unreached() };
let x = (if b { fun1 } else { fun2 })(20); }
// Same test, but with an assert failure:
fn foo2(b: bool) { let mut i: u64 = 0;
let mut fun1 = Option::None; let mut fun2 = Option::None;
while ({ let f = move |j: u64| requires j == 20 || j == i { j }; if i == 0 { fun1 = Option::Some(f); } else if i == 1 { fun2 = Option::Some(f); }
i = i + 1;
i < 2 }) invariant i == 0 || i == 1 || i == 2, i >= 1 ==> fun1 is Some && (forall|x: u64| (x == 20 || x == 0 ==> fun1->0.requires((x,)))), i >= 2 ==> fun2 is Some && (forall|x: u64| (x == 20 || x == 1 ==> fun2->0.requires((x,)))), { }
assert(i == 2 || i == 3);
let fun1 = match fun1 { Option::Some(fun1) => fun1, Option::None => unreached() }; let fun2 = match fun2 { Option::Some(fun1) => fun1, Option::None => unreached() };
let x = (if b { fun1 } else { fun2 })(0); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] name_collisions ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1(b: bool) { let x: u64 = 5; let f = |x: u64| requires x == 6 { }; f(6); }
fn test2(b: bool) { let x: u64 = 5; let f = |x: u64| requires x == 6 { assert(false); // FAILS }; f(6); }
fn test3(b: bool) { let x: u64 = 5; let f = |x: u64| -> (x: u64) requires x == 6 ensures x == 7 { 7 as u64 }; let t = f(6); assert(t == 7); }
fn test4(b: bool) { let x: u64 = 7; let f = |x: u64| -> (x: u64) requires x == 6 ensures x == 7 // FAILS { return 8 as u64; }; let t = f(6); assert(t == 7); }
fn test5(b: bool) { let x: u64 = 7; let f = |x: u64| requires x == 6 { let g = |x: u64| requires x == 19 { assert(false); // FAILS }; }; }
fn test6(b: bool) { let x: u64 = 7; let f = |x: u64| requires x == 6 { let g = |x: u64| requires x == 19 { };
assert(g.requires((19,))); assert(g.requires((6,))); // FAILS }; }
fn test7(b: bool) { let x: u64 = 7; let f = |x: u64| requires x == 6 { assert(x == 6);
let x = 19;
assert(x == 19); assert(false); // FAILS }; }
fn test8(b: bool) { let x: u64 = 7; let f = |x: u64, y: u64| requires x == 5 && { let x = y; x != 5 } { assert(x == 5); assert(y != 5); assert(false); // FAILS }; }
fn test9(b: bool) { let x: u64 = 7; let f = |x: u64, y: u64| requires x == 5 && { let x = y; x != 5 } { };
assert(f.requires((5, 7))); assert(f.requires((5, 5))); // FAILS } } => Err(err) => assert_fails(err, 7)}
test_verify_one_file_with_options! { #[test] return_unit ["vstd"] => verus_code! { use vstd::prelude::*;
fn test() { let f = |x: u64| -> (res: ()) ensures res == () { };
let f1 = |x: u64| -> (res: ()) ensures res == () { () };
let g = |x: u64| ensures false { assume(false); };
assert(g.ensures((2,), ()) ==> false); } } => Ok(())}
test_verify_one_file_with_options! { #[test] closure_is_dead_end ["vstd"] => verus_code! { use vstd::prelude::*;
fn test() { let f = |x: u64| { assume(false); };
// things proved within the closure should be scoped to within the closure
assert(false); // FAILS } } => Err(err) => assert_one_fails(err)}
test_verify_one_file_with_options! { #[test] exec_closure_spec_param_error ["vstd"] => verus_code! { use vstd::prelude::*;
fn test() { let g = |#[verifier::spec] y: u64| { 5 }; } } => Err(err) => assert_vir_error_msg(err, "closures only accept exec-mode parameters")}
test_verify_one_file_with_options! { #[test] exec_closure_proof_param_error ["vstd"] => verus_code! { use vstd::prelude::*;
fn test() { let g = |#[verifier::proof] y: u64| { 5 }; } } => Err(err) => assert_vir_error_msg(err, "closures only accept exec-mode parameters")}
// mut restrictions
test_verify_one_file_with_options! { #[test] disallowed_mut_capture1 ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut a = 5;
let f = |t: u8| { a = 7; };
f(7); } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture2 ["vstd"] => verus_code! { use vstd::prelude::*;
fn takes_mut(u: &mut u64) { }
fn test1() { let mut a = 5;
let f = |t: u8| { takes_mut(&mut a); };
f(7); } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture3 ["vstd"] => verus_code! { use vstd::prelude::*;
fn takes_mut(u: &mut u64) { }
fn test1(a: &mut u64) { let f = |t: u8| { takes_mut(a); };
f(7); } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture4 ["vstd"] => verus_code! { use vstd::prelude::*;
fn takes_mut(u: &mut u64) { }
fn test1(a: &mut u64) { let f = |t: u8| { takes_mut(&mut *a); };
f(7); } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture5 ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut x = 0; let f = |t: u8| { let ref mut y = x; }; } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture6 ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut x = 0; let f = |t: u8| { match x { ref mut y => { } } }; } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture7 ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut x = Some(0); let f = |t: u8| { if let Some(ref mut y) = x { } }; } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture8 ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut x = Some(0); let f = |t: u8| { let Some(ref mut y) = x else { return; }; }; } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] mut_internal_to_closure_is_okay ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut a = 5;
let f = |t: u8| { let mut a = 16; a = 7; };
f(7); } } => Ok(())}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture_nested ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let mut a = 5;
let f = |t: u8| { let g = |s: u8| { a = 7; }; };
f(7); } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
test_verify_one_file_with_options! { #[test] disallowed_mut_capture_nested2 ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1() { let f = |t: u8| { let mut a = 5; let g = |s: u8| { a = 7; }; };
f(7); } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support closures capturing a mutable reference")}
// closures that depend on type params
test_verify_one_file_with_options! { #[test] closure_depends_on_type_param ["vstd"] => verus_code! { use vstd::prelude::*;
fn test1<T>(some_t: T) { let f = |t: T| -> (s: T) ensures s == t { t };
let r = f(some_t); assert(equal(r, some_t)); } } => Ok(())}
// type invariants
test_verify_one_file_with_options! { #[test] closure_params_type_invariants_issue457 ["vstd"] => verus_code! { fn test(x: u8) { assert(x < 256); let f = |y: u8| { assert(x < 256); assert(y < 256); }; } } => Ok(())}
// type well-formed
test_verify_one_file! { #[test] error_msg_use_external_type_closure_param verus_code! { #[verifier(external)] struct X { }
fn stuff() { let f = |x: X| { }; } } => Err(err) => assert_vir_error_msg(err, "cannot use type `test_crate::X` which is ignored")}
test_verify_one_file_with_options! { #[test] error_msg_use_external_type_closure_ret ["exec_allows_no_decreases_clause"] => verus_code! { #[verifier(external)] struct X { }
fn stuff() { let f = || -> X { loop { } }; } } => Err(err) => assert_vir_error_msg(err, "cannot use type `test_crate::X` which is ignored")}
test_verify_one_file_with_options! { #[test] right_decorations_for_tuple_arg ["vstd"] => verus_code! { use vstd::prelude::*;
fn test<T: Copy, F: std::clone::Clone>(s: &T, key: T, less: F) where F: Fn(T, T) -> bool requires forall |x, y| #[trigger] less.requires((x, y)), { less(key, *s); } } => Ok(())}
test_verify_one_file_with_options! { #[test] ref_decoration_in_type_params_issue619 ["vstd"] => verus_code! { use vstd::prelude::*;
// Sometimes when we instantiate a type parameter, // either when calling a function, or calling foo.requires or foo.ensures, // we end up instantiating it with a reference type &F. // This test makes sure we don't have verification failures as a result // The ref decoration should be ignored
fn test0<T: Copy, F>(left: T, right: T, leq: &F) where F: Fn(T, T) -> bool requires forall |x, y| #[trigger] leq.requires((x, y)) { let x = leq(left, right); }
fn moo() { let t = || { }; t(); }
fn stuff2<T: FnOnce() -> bool>(t: T) requires t.requires(()), !t.ensures((), false), { t(); }
fn moo2() { let t = || -> (b: bool) ensures b == true { true }; stuff2(t); }
fn stuff3<T: Fn() -> bool>(t: T) requires t.requires(()), !t.ensures((), false), { t(); }
fn moo3() { let t = || -> (b: bool) ensures b == true { true }; stuff3(t); }
fn stuff4<T: Fn() -> bool>(t: &T) requires t.requires(()), !t.ensures((), false), { t(); }
fn moo4() { let t = || -> (b: bool) ensures b == true { true }; stuff4(&t); } } => Ok(())}
test_verify_one_file! { #[test] no_impl_fn_once verus_code! { struct X { }
impl FnOnce<(u8, u8)> for X { type Output = u8; extern "rust-call" fn call_once(self, y: (u8, u8)) -> u8 { 0 } } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support implementing this trait")}
test_verify_one_file! { #[test] no_impl_fn_mut verus_code! { struct X { }
#[verifier::external] impl FnOnce<(u8, u8)> for X { type Output = u8; extern "rust-call" fn call_once(self, y: (u8, u8)) -> u8 { 0 } }
impl FnMut<(u8, u8)> for X { extern "rust-call" fn call_mut(&mut self, y: (u8, u8)) -> u8 { 0 } } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support implementing this trait")}
test_verify_one_file! { #[test] no_impl_fn verus_code! { struct X { }
#[verifier::external] impl FnOnce<(u8, u8)> for X { type Output = u8; extern "rust-call" fn call_once(self, y: (u8, u8)) -> u8 { 0 } }
#[verifier::external] impl FnMut<(u8, u8)> for X { extern "rust-call" fn call_mut(&mut self, y: (u8, u8)) -> u8 { 0 } }
impl Fn<(u8, u8)> for X { extern "rust-call" fn call(&self, y: (u8, u8)) -> u8 { 0 } } } => Err(err) => assert_vir_error_msg(err, "Verus does not currently support implementing this trait")}
test_verify_one_file! { #[test] tracked_variables_captured_by_closures_send verus_code! { tracked struct X { rc: std::rc::Rc<u32>, }
#[verifier::external_body] proof fn get_x() -> (tracked x: X) { unimplemented!(); }
fn require_send<T: Send>(t: T) { }
fn test() { let tracked x = get_x();
let clos = move || { let tracked y = x; () };
require_send(clos); } } => Err(err) => assert_rust_error_msg(err, "`std::rc::Rc<u32>` cannot be sent between threads safely")}
test_verify_one_file! { #[test] tracked_consume_nested verus_code! { tracked struct X { }
proof fn consume_x(tracked x: X) { }
fn test() { let tracked x = X { };
let clos = move || { let clos2 = move || { let tracked y = x; proof { consume_x(y); } }; };
proof { consume_x(x); } } } => Err(err) => assert_rust_error_msg(err, "use of moved value: `x`")}
test_verify_one_file! { #[test] tracked_consume_ghost verus_code! { tracked struct X { }
proof fn consume_x(tracked x: X) { }
proof fn ghost_x(x: X) { }
fn test() { let tracked x = X { };
let clos = move || { let clos2 = move || { proof { ghost_x(x); } }; };
proof { consume_x(x); } } } => Ok(())}
test_verify_one_file! { #[test] param_boxing_issue1725 verus_code! { mod a { use vstd::prelude::*;
fn write<'a, T, C>(t: &'a T) { let j = |s: &crate::foo::Context<'a, T>| true; } }
mod foo { use vstd::prelude::*;
pub struct Context<'a, T> { t: &'a T, } } } => Ok(())}
test_verify_one_file! { #[test] send_capture_tracked verus_code! { use vstd::prelude::*; use vstd::invariant::*;
struct Pred<T> { t: T } impl<T> InvariantPredicate<(), T> for Pred<T> { open spec fn inv(k: (), v: T) -> bool { true } }
struct X { }
fn require_send<R: Send>(r: R) { }
fn test(Tracked(t): Tracked<&'static LocalInvariant<(), X, Pred<X>>>) { let clos = || { let tracked z = t; }; require_send(clos); } } => Err(err) => assert_rust_error_msg(err, "`vstd::invariant::LocalInvariant<(), X, Pred<X>>` cannot be shared between threads safely")}
test_verify_one_file! { #[test] sync_capture_tracked verus_code! { use vstd::prelude::*; use vstd::invariant::*;
struct Pred<T> { t: T } impl<T> InvariantPredicate<(), T> for Pred<T> { open spec fn inv(k: (), v: T) -> bool { true } }
struct X { }
fn require_sync<R: Sync>(r: R) { }
fn test2(Tracked(t): Tracked<LocalInvariant<(), X, Pred<X>>>) { let clos = || { let tracked z = t; }; require_sync(clos); } } => Err(err) => assert_rust_error_msg(err, "`vstd::invariant::LocalInvariant<(), X, Pred<X>>` cannot be shared between threads safely")}
test_verify_one_file! { #[test] test_verus_capture_is_more_precise verus_code! { use vstd::*;
struct Y { u: u64, }
struct X { a: Y, b: Y, }
fn test(x: X) { let clos1 = || { assert(x == x); let y = &x.a; };
let clos2 = || { assert(x == x); let y = &x.b; };
clos1(); clos2(); }
fn test2(x: X) { let clos1 = || { assert(x == x); let y = &x.a; };
let clos2 = || { assert(x == x); let y = &x.a; };
clos1(); clos2(); }
fn test3(x: X) { let mut x = x;
let clos1 = || { assert(x == x); let y = &x.a; };
x.b = Y { u: 0 };
clos1(); } } => Ok(())}
test_verify_one_file! { #[test] test_verus_capture_is_more_precise_fail verus_code! { use vstd::*;
struct Y { u: u64, }
struct X { a: Y, b: Y, }
fn test4(x: X) { let mut x = x;
let clos1 = || { assert(x == x); let y = &x.a; };
x.a = Y { u: 0 };
clos1(); } } => Err(err) => assert_rust_error_msg(err, "cannot assign to `x.a` because it is borrowed")}
test_verify_one_file! { #[test] test_verus_capture_is_more_precise_fail_tracked verus_code! { use vstd::*;
struct Y { u: u64, }
struct X { a: Y, b: Y, }
fn test4(x: X) { let mut x = x;
let clos1 = || { assert(x == x); let tracked y = &x.a; };
x.a = Y { u: 0 };
clos1(); } } => Err(err) => assert_rust_error_msg(err, "cannot assign to `x.a` because it is borrowed")}
test_verify_one_file! { #[test] test_complex_projections verus_code! { use vstd::*;
struct Y<Z> { u: Z, }
struct X<'a, Z> { a: (Y<Z>, &'a Box<Y<Z>>), b: Y<Z>, }
fn test(x: X<u64>) { let mut x = x;
let clos1 = || { assert(x == x); let y = &x.a.1.u; };
x.b = Y { u: 20 };
clos1(); }
fn test2<'a>(x: X<'a, u64>, t: &'a Box<Y<u64>>) { let mut x = x;
let clos1 = || { assert(x == x); let y = &x.a.1.u; };
x.a.1 = t;
clos1(); } } => Ok(())}
test_verify_one_file! { #[test] test_complex_projections2 verus_code! { use vstd::*;
struct Y<'a, Z> { u: &'a Z, }
struct X<'a, Z> { a: (Y<'a, Z>, Box<Y<'a, Z>>), b: Y<'a, Z>, }
fn test1<'a>(x: X<'a, u64>, t: Box<Y<'a, u64>>) { let mut x = x;
let clos1 = || { assert(x == x); let y = &x.a.1.u; };
x.a.1 = t;
clos1(); } } => Err(err) => assert_rust_error_msg(err, "cannot assign to `x.a.1` because it is borrowed")}
test_verify_one_file! { #[test] test_complex_projections3 verus_code! { use vstd::*;
struct Y<'a, Z> { u: &'a Z, }
struct X<'a, Z> { a: (Y<'a, Z>, Box<Y<'a, Z>>), b: Y<'a, Z>, }
fn require_static<A: 'static>(a: A) { }
fn test2<'a>(x: X<'a, u64>, t: Box<Y<'a, u64>>) { let clos1 = || { assert(x == x); let y = &x.a.1.u; }; require_static(clos1); } } => Err(err) => assert_rust_error_msgs(err, &[ "`x.a.1.u` does not live long enough", "borrowed data escapes outside of function", ])}
test_verify_one_file! { #[test] test_tracked_complex_projections2 verus_code! { use vstd::*;
struct Y<'a, Z> { u: &'a Z, }
struct X<'a, Z> { a: (Y<'a, Z>, Box<Y<'a, Z>>), b: Y<'a, Z>, }
fn test1<'a>(x: X<'a, u64>, t: Box<Y<'a, u64>>) { let mut x = x;
let clos1 = || { assert(x == x); let tracked y = &x.a.1.u; };
x.a.1 = t;
clos1(); } } => Err(err) => assert_rust_error_msg(err, "cannot assign to `x.a.1` because it is borrowed")}
test_verify_one_file! { #[test] test_tracked_complex_projections3 verus_code! { use vstd::*;
struct Y<'a, Z> { u: &'a Z, }
struct X<'a, Z> { a: (Y<'a, Z>, Box<Y<'a, Z>>), b: Y<'a, Z>, }
fn require_static<A: 'static>(a: A) { }
fn test2<'a>(x: X<'a, u64>, t: Box<Y<'a, u64>>) { let clos1 = || { assert(x == x); let tracked y = &x.a.1.u; }; require_static(clos1); } } => Err(err) => assert_rust_error_msgs(err, &[ "`x.a.1.u` does not live long enough", "borrowed data escapes outside of function", ])}
test_verify_one_file! { #[test] fake_read_ok verus_code! { struct X { }
fn test() { let x = X { };
let clos1 = || { match x { _ => { } } }; } } => Ok(())}
test_verify_one_file! { #[test] fake_read_ok2 verus_code! { fn require_static<T: 'static>(t: T) { }
fn test() { let mut unit = (); let mut x = &unit;
let clos = move || { match x { _ => { } } };
require_static(clos); } } => Ok(())}
test_verify_one_file! { #[test] return_in_loop_in_closure verus_code! { #[verifier::loop_isolation(true)] #[allow(unreachable_code)] fn test_loop() { let r = || { loop decreases 0int { return; } }; } } => Ok(())}
test_verify_one_file! { #[test] closure_local_const verus_code! { use vstd::prelude::*;
fn foo() { let x = || -> (z: u64) ensures z == 42 { const Z: u64 = 42; Z }; let z = x(); assert(z == 42); } } => Ok(())}
test_verify_one_file! { #[test] closure_local_fn verus_code! { use vstd::prelude::*;
fn foo() { let x = || -> (z: u64) ensures z == 42 { fn f() -> (z: u64) ensures z == 42 { 42 }
let z = f(); assert(z == 42); z }; let z = x(); assert(z == 42); } } => Ok(())}
test_verify_one_file! { #[test] closure_local_struct verus_code! { use vstd::prelude::*;
fn foo() { let x = || -> (z: u64) ensures z == 42 { struct S { x: u64, }
let s = S { x: 42 }; s.x }; let z = x(); assert(z == 42); } } => Ok(())}
test_verify_one_file_with_options! { #[test] closure_edition2018 ["--edition 2018"] => verus_code! { use vstd::prelude::*; pub fn ghost_capture_panics2() { let ghost expected = 1u64;
let _closure = || -> (result: u64) ensures result == expected { { 1 } }; } } => Ok(())}
test_verify_one_file_with_options! { #[test] closure_edition2021 ["--edition 2021"] => verus_code! { use vstd::prelude::*; pub fn ghost_capture_panics2() { let ghost expected = 1u64;
let _closure = || -> (result: u64) ensures result == expected { { 1 } }; } } => Ok(())}
test_verify_one_file_with_options! { #[test] closure_verus_spec_attr_edition2018 ["--edition 2018"] => code! { use vstd::prelude::*; #[verus_spec] pub fn ghost_capture_panics() { proof_decl! { let ghost expected = 1u64; }
let _closure = #[verus_spec(result: u64 => ensures result == expected, )] || 1; } } => Ok(())}
test_verify_one_file_with_options! { #[test] closure_verus_spec_attr_edition2021 ["--edition 2021"] => code! { use vstd::prelude::*; #[verus_spec] pub fn ghost_capture_panics() { proof_decl! { let ghost expected = 1u64; }
let _closure = #[verus_spec(result: u64 => ensures result == expected, )] || 1; } } => Ok(())}
test_verify_one_file_with_options! { #[test] closure_edition2018_fail_tracked_var ["--edition 2018"] => verus_code! { use vstd::prelude::*; tracked struct X { } pub fn ghost_capture_panics2() { let ghost expected = 1u64;
let tracked x = X{};
let closure = || -> (result: u64) ensures result == expected { let tracked x1 = x; 0 };
let tracked y = x; closure(); } } => Err(e) => assert_rust_error_msg(e, "use of moved value: `x`")}