Enum OrderError 

pub enum OrderError {
    Cycle {
        vars: Vec<VarId>,
    },
    UnknownVar {
        var: VarId,
    },
}

Why a set of before edges has no solve order.

Variants

Cycle

The edges contain a cycle (LRM 18.5.9: “circular dependencies … are not allowed”). vars is one cycle, in before order, without repeating its first variable (a self-edge solve a before a is the one-variable cycle).

Fields

vars: Vec<VarId>

The variables on the cycle.

UnknownVar

An edge names a variable id outside 0..n.

Fields

var: VarId

The offending id.

Trait Implementations

impl Clone for OrderError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OrderError

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

Formats the value using the given formatter.

impl Display for OrderError

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

Formats the value using the given formatter.

impl Eq for OrderError

impl Error for OrderError

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 From<OrderError> for BuildError

fn from(e: OrderError) -> Self

Converts to this type from the input type.

impl PartialEq for OrderError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OrderError