Enum Level

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

Setting for how to handle a lint.

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

Variants

Allow

The allow level will not issue any message.

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.

Warn

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

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.

Deny

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

Forbid

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

Implementations

impl Level

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

Converts a level to a lower-case string.

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

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

pub fn from_attr(attr: &impl AttributeExt) -> Option<Self>

Converts an Attribute to a level.

pub fn from_symbol(s: Symbol, id: Option<AttrId>) -> Option<Self>

Converts a Symbol to a level.

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

pub fn is_error(self) -> bool

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

Trait Implementations

impl Clone for Level

fn clone(&self) -> Level

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Level

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

Formats the value using the given formatter.

impl Hash for Level

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<__CTX> HashStable<__CTX> for Level

where __CTX: HashStableContext,

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

impl Ord for Level

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Level

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Level

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Level

impl Eq for Level

impl StructuralPartialEq for Level

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:

• Allow: 0 bytes
• Expect: 16 bytes
• Warn: 0 bytes
• ForceWarn: 16 bytes
• Deny: 0 bytes
• Forbid: 0 bytes