Struct arithmetic_eval::fns::AssertFails
source · pub struct AssertFails { /* private fields */ }
Expand description
Assertion that the provided function raises an error. Errors can optionally be matched against a predicate.
If an error is raised, but does not match the predicate, it is bubbled up.
§Type
(using arithmetic-typing
notation)
(() -> 'T) -> ()
§Examples
let program = "
obj = #{ x: 3 };
assert_fails(|| obj.x + obj.y); // pass: `obj.y` is not defined
assert_fails(|| obj.x); // fail: function executes successfully
";
let module = Untyped::<F32Grammar>::parse_statements(program)?;
let module = ExecutableModule::new("test_assert", &module)?;
let mut env = Environment::new();
env.insert_native_fn("assert_fails", fns::AssertFails::default());
let err = module.with_env(&env)?.run().unwrap_err();
assert_eq!(
err.source().location().in_module().span(program),
"assert_fails(|| obj.x)"
);
Custom error matching:
let assert_fails = fns::AssertFails::new(|err| {
matches!(err.kind(), ErrorKind::NativeCall(_))
});
let program = "
assert_fails(|| assert_fails(1)); // pass: native error
assert_fails(assert_fails); // fail: arg len mismatch
";
let module = Untyped::<F32Grammar>::parse_statements(program)?;
let module = ExecutableModule::new("test_assert", &module)?;
let mut env = Environment::new();
env.insert_native_fn("assert_fails", assert_fails);
let err = module.with_env(&env)?.run().unwrap_err();
assert_eq!(
err.source().location().in_module().span(program),
"assert_fails(assert_fails)"
);
Implementations§
Trait Implementations§
source§impl Clone for AssertFails
impl Clone for AssertFails
source§fn clone(&self) -> AssertFails
fn clone(&self) -> AssertFails
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for AssertFails
impl Debug for AssertFails
source§impl Default for AssertFails
impl Default for AssertFails
source§impl<T: 'static + Clone> NativeFn<T> for AssertFails
impl<T: 'static + Clone> NativeFn<T> for AssertFails
source§fn evaluate(
&self,
args: Vec<SpannedValue<T>>,
ctx: &mut CallContext<'_, T>,
) -> EvalResult<T>
fn evaluate( &self, args: Vec<SpannedValue<T>>, ctx: &mut CallContext<'_, T>, ) -> EvalResult<T>
Executes the function on the specified arguments.
impl Copy for AssertFails
Auto Trait Implementations§
impl Freeze for AssertFails
impl RefUnwindSafe for AssertFails
impl Send for AssertFails
impl Sync for AssertFails
impl Unpin for AssertFails
impl UnwindSafe for AssertFails
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Copy,
impl<T> CloneToUninit for Twhere
T: Copy,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§default unsafe fn clone_to_uninit(&self, dst: *mut T)
default unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)