Enum InternError 

#[non_exhaustive]
pub enum InternError {
    SymbolSpaceExhausted,
}

An error returned when a string cannot be interned.

Interning a new string consumes one symbol from a finite space. When that space is exhausted there is no symbol left to assign, and try_intern reports it with this error rather than panicking or aliasing the string onto an existing symbol.

This enum is #[non_exhaustive]: future releases may add variants for new failure modes without it being a breaking change, so a match on it must include a wildcard arm.

Examples

use intern_lang::{InternError, Interner};

let mut interner = Interner::new();
// Far below the symbol-space bound, interning always succeeds.
assert!(interner.try_intern("name").is_ok());

fn describe(err: InternError) -> &'static str {
    match err {
        InternError::SymbolSpaceExhausted => "out of symbols",
        _ => "unknown interning error",
    }
}
assert_eq!(describe(InternError::SymbolSpaceExhausted), "out of symbols");

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

SymbolSpaceExhausted

The symbol space is exhausted: the interner has already issued all u32::MAX symbols, so no new string can be assigned one.

Reaching this requires interning over four billion distinct strings, which exhausts memory on any normal machine long before the symbol space. A caller that must handle the boundary explicitly — rather than relying on it being unreachable — should use try_intern and treat this variant as a hard stop: the interner cannot accept further distinct strings.

Trait Implementations

impl Clone for InternError

fn clone(&self) -> InternError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for InternError

impl Debug for InternError

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

Formats the value using the given formatter.

impl Display for InternError

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

Formats the value using the given formatter.

impl Eq for InternError

impl Error for InternError

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 Hash for InternError

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 PartialEq for InternError

fn eq(&self, other: &InternError) -> 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 StructuralPartialEq for InternError