pub enum Level {
    Allow,
    Expect(LintExpectationId),
    Warn,
    ForceWarn(Option<LintExpectationId>),
    Deny,
    Forbid,
}
Expand description

Setting for how to handle a lint.

See: https://doc.rust-lang.org/rustc/lints/levels.html

Variants§

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Allow

The allow level will not issue any message.

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Expect(LintExpectationId)

The expect level will suppress the lint message but in turn produce a message if the lint wasn’t issued in the expected scope. Expect should not be used as an initial level for a lint.

Note that this still means that the lint is enabled in this position and should be emitted, this will in turn fulfill the expectation and suppress the lint.

See RFC 2383.

The LintExpectationId is used to later link a lint emission to the actual expectation. It can be ignored in most cases.

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Warn

The warn level will produce a warning if the lint was violated, however the compiler will continue with its execution.

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ForceWarn(Option<LintExpectationId>)

This lint level is a special case of Warn, that can’t be overridden. This is used to ensure that a lint can’t be suppressed. This lint level can currently only be set via the console and is therefore session specific.

The LintExpectationId is intended to fulfill expectations marked via the #[expect] attribute, that will still be suppressed due to the level.

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Deny

The deny level will produce an error and stop further execution after the lint pass is complete.

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Forbid

Forbid is equivalent to the deny level but can’t be overwritten like the previous levels.

Implementations§

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impl Level

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

Converts a level to a lower-case string.

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pub fn from_str(x: &str) -> Option<Level>

Converts a lower-case string to a level. This will never construct the expect level as that would require a LintExpectationId

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pub fn from_attr(attr: &Attribute) -> Option<Level>

Converts a symbol to a level.

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

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pub fn is_error(self) -> bool

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pub fn get_expectation_id(&self) -> Option<LintExpectationId>

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
1.0.0 · source§

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 Hash for Level

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

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<__CTX> HashStable<__CTX> for Levelwhere
    __CTX: HashStableContext,

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fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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impl Ord for Level

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fn cmp(&self, other: &Level) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Selfwhere
    Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Selfwhere
    Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl PartialEq<Level> for Level

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd<Level> for Level

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fn partial_cmp(&self, other: &Level) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Copy for Level

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impl Eq for Level

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impl StructuralEq for Level

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impl StructuralPartialEq for Level

Auto Trait Implementations§

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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> Any for Twhere
    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> Borrow<T> for Twhere
    T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
    U: From<T>,

const: unstable · source§

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> ToOwned for Twhere
    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, U> TryFrom<U> for Twhere
    U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

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 Twhere
    U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 24 bytes

Size for each variant:

  • Allow: 0 bytes
  • Expect: 20 bytes
  • Warn: 0 bytes
  • ForceWarn: 20 bytes
  • Deny: 0 bytes
  • Forbid: 0 bytes