Enum ParamError 

#[non_exhaustive]
pub enum ParamError {
    TooMany,
    OutOfOrder {
        index: u16,
    },
    Unnamed {
        index: u16,
    },
    DuplicateName {
        index: u16,
    },
    RestDefault {
        index: u16,
    },
    Signature {
        index: u16,
    },
}

Why a ParamList is malformed, or does not fit the signature it is attached to.

Examples

use bytecode_lang::{Param, ParamError, ParamKind, ParamList};

let list = ParamList::new(vec![Param::new(ParamKind::Normal, None)]);
assert_eq!(list.validate(), Err(ParamError::Unnamed { index: 0 }));

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.

TooMany

More than 255 parameters, or more than 64 when a parameter has a default (the presence mask is 64 bits).

OutOfOrder

A parameter’s kind is out of the required order, or a second rest parameter of one rank appears.

Fields

index: u16

The parameter.

Unnamed

A normal or named-only parameter has no name.

Fields

index: u16

The parameter.

DuplicateName

Two parameters have the same name.

Fields

index: u16

The second of them.

RestDefault

A rest parameter is marked as having a default.

Fields

index: u16

The parameter.

Signature

The list does not fit the function’s signature: the signature must have one parameter per entry, plus a trailing i64 presence mask when an entry has a default; rest parameters are dyn; by-reference parameters are dyn or a ref (to a cell dyn).

Fields

index: u16

The first signature parameter that does not fit (the parameter count, if the counts differ).

Trait Implementations

impl Clone for ParamError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ParamError

impl Debug for ParamError

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

Formats the value using the given formatter.

impl Display for ParamError

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

Formats the value using the given formatter.

impl Eq for ParamError

impl Error for ParamError

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 ParamError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParamError