Struct SlowPattern 

pub struct SlowPattern { /* private fields */ }

Some pattern may be potentially slow.

This warning indicates that a pattern may be very slow to match, and can degrade rule’s the performance. In most cases this is caused by patterns that doesn’t contain any large fixed sub-pattern that be used for speeding up the scan. For example, {00 [1-10] 01} is very slow because the only fixed sub-patterns (00 and 01) are only one byte long.

Example

warning[slow_pattern]: slow pattern
--> line:3:5
  |
3 |     $a = {00 [1-10] 01}
  |     ------------------ this pattern may slow down the scan
  |

Implementations

impl SlowPattern

pub const fn code() -> &'static str

Returns a unique code identifying the type of error/warning.

Error codes have the form “Eddd”, where “ddd” is an error number (examples: “E001”, “E020”). Warnings have more descriptive codes, like: “slow_pattern”, “unsatisfiable_expr”, etc.

pub fn title(&self) -> &str

Returns the title of this error/warning.

pub fn labels(&self) -> impl Iterator<Item = Label<'_>>

Returns the labels associated to this error/warning.

pub fn footers(&self) -> impl Iterator<Item = Footer<'_>>

Returns the footers associated to this error/warning.

Trait Implementations

impl Debug for SlowPattern

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

Formats the value using the given formatter.

impl Display for SlowPattern

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

Formats the value using the given formatter.

impl Error for SlowPattern

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for SlowPattern

fn eq(&self, other: &SlowPattern) -> 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 Serialize for SlowPattern

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for SlowPattern

impl StructuralPartialEq for SlowPattern