Enum KernelError 

pub enum KernelError {
    Source(String),
    Assembly(AssemblyError),
    Refused {
        engine: Engine,
        reason: String,
    },
    ConstantFold {
        reason: String,
    },
}

Why a kernel was not built: the one error type of every constructor that takes an Engine.

Variants

Source(String)

The source did not parse or compile; the message is the DSL front end’s.

Assembly(AssemblyError)

The graph did not assemble.

Refused

The engine refuses this graph, which the interpreter accepts; reason names the node or construct.

Fields

engine: Engine

The engine that refused.

reason: String

The node or construct it cannot run.

ConstantFold

A compile-constant step could not be computed. A step no input reaches runs once at build, so what it does there it will do on every pull; there is nothing a later evaluation could supply that would make it succeed. Distinct from Self::Refused, which is one engine declining a program the others accept: every engine reports this one, and reports it at build.

Fields

reason: String

The failure as the node reported it, enriched with the node’s name, the outputs it feeds, and the program’s diagnostic context, as an evaluation failure would be.

Trait Implementations

impl Debug for KernelError

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

Formats the value using the given formatter.

impl Display for KernelError

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

Formats the value using the given formatter.

impl Error for KernelError

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<AssemblyError> for KernelError

fn from(e: AssemblyError) -> Self

Converts to this type from the input type.