rustc_errors

Enum Level

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pub enum Level {

Show 13 variants    Bug,
    Fatal,
    Error,
    DelayedBug,
    ForceWarning(Option<LintExpectationId>),
    Warning,
    Note,
    OnceNote,
    Help,
    OnceHelp,
    FailureNote,
    Allow,
    Expect(LintExpectationId),

}
Expand description
Levelis_errorEmissionGuaranteeTop-levelSubUsed in lints?
BugyesBugAbortyes--
FatalyesFatalAbort/FatalError1yes--
ErroryesErrorGuaranteedyes-yes
DelayedBugyesErrorGuaranteedyes--
ForceWarning-()yes-lint-only
Warning-()yesyesyes
Note-()rareyes-
OnceNote-()-yeslint-only
Help-()rareyes-
OnceHelp-()-yeslint-only
FailureNote-()rare--
Allow-()yes-lint-only
Expect-()yes-lint-only

  1. FatalAbort normally, FatalError in the non-aborting “almost fatal” case that is occasionally used. ↩

Variants§

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Bug

For bugs in the compiler. Manifests as an ICE (internal compiler error) panic.

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Fatal

An error that causes an immediate abort. Used for things like configuration errors, internal overflows, some file operation errors.

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Error

An error in the code being compiled, which prevents compilation from finishing. This is the most common case.

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DelayedBug

This is a strange one: lets you register an error without emitting it. If compilation ends without any other errors occurring, this will be emitted as a bug. Otherwise, it will be silently dropped. I.e. “expect other errors are emitted” semantics. Useful on code paths that should only be reached when compiling erroneous code.

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ForceWarning(Option<LintExpectationId>)

A force-warn lint warning about the code being compiled. Does not prevent compilation from finishing.

The LintExpectationId is used for expected lint diagnostics. In all other cases this should be None.

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Warning

A warning about the code being compiled. Does not prevent compilation from finishing. Will be skipped if can_emit_warnings is false.

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Note

A message giving additional context.

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OnceNote

A note that is only emitted once.

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Help

A message suggesting how to fix something.

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OnceHelp

A help that is only emitted once.

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FailureNote

Similar to Note, but used in cases where compilation has failed. When printed for human consumption, it doesn’t have any kind of note: label.

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Allow

Only used for lints.

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Expect(LintExpectationId)

Only used for lints.

Implementations§

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impl Level

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pub(crate) fn color(self) -> ColorSpec

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pub fn to_str(self) -> &'static str

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pub fn is_failure_note(&self) -> bool

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pub(crate) fn can_be_subdiag(&self) -> bool

Trait Implementations§

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impl Clone for Level

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fn clone(&self) -> Level

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Level

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<__D: SpanDecoder> Decodable<__D> for Level

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fn decode(__decoder: &mut __D) -> Self

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impl Display for Level

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<__E: SpanEncoder> Encodable<__E> for Level

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fn encode(&self, __encoder: &mut __E)

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impl Hash for Level

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl IntoDiagArg for Level

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fn into_diag_arg(self) -> DiagArgValue

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impl PartialEq for Level

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fn eq(&self, other: &Level) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for Level

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impl Eq for Level

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impl StructuralPartialEq for Level

Auto Trait Implementations§

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impl Freeze for Level

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impl RefUnwindSafe for Level

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impl Send for Level

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impl Sync for Level

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impl Unpin for Level

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impl UnwindSafe for Level

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> AnyEq for T
where T: Any + PartialEq,

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fn equals(&self, other: &(dyn Any + 'static)) -> bool

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fn as_any(&self) -> &(dyn Any + 'static)

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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T

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fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 20 bytes

Size for each variant:

  • Bug: 0 bytes
  • Fatal: 0 bytes
  • Error: 0 bytes
  • DelayedBug: 0 bytes
  • ForceWarning: 16 bytes
  • Warning: 0 bytes
  • Note: 0 bytes
  • OnceNote: 0 bytes
  • Help: 0 bytes
  • OnceHelp: 0 bytes
  • FailureNote: 0 bytes
  • Allow: 0 bytes
  • Expect: 16 bytes