Enum BuildError 

pub enum BuildError {
    DuplicateNode {
        id: String,
    },
    MissingNode {
        from: String,
        to: String,
    },
    MissingEntryPoint,
    MissingExitPoint,
    InvalidEdgeDefinition {
        from: String,
        to: String,
        reason: String,
    },
    InvalidFallback {
        node: String,
        reason: String,
    },
}

构建时结构校验错误。

仅验证图的结构性正确性：节点存在、边引用有效、入口/出口存在、Fallback 不指向自身。 绝不产生 Warning。 Warning 迁移至 GraphDiagnostics。

Variants

DuplicateNode

节点 ID 重复（后者覆盖前者）

Fields

id: String

MissingNode

边引用了不存在的节点

Fields

from: String

to: String

MissingEntryPoint

未指定入口节点

MissingExitPoint

未指定出口节点

InvalidEdgeDefinition

边定义无效

Fields

from: String

to: String

reason: String

InvalidFallback

Fallback 边配置无效（如指向自身 = retry，不是 fallback）

Fields

node: String

reason: String

Trait Implementations

impl Clone for BuildError

fn clone(&self) -> BuildError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BuildError

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

Formats the value using the given formatter.

impl Display for BuildError

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

Formats the value using the given formatter.

impl Error for BuildError

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.