Enum OverlayMergeError 

pub enum OverlayMergeError {
    Collision {
        project: ProjectName,
        task: TaskName,
        sources: BTreeSet<DefinitionSource>,
    },
}

A single error encountered during overlay merging.

Multiple instances are accumulated into OverlayMergeErrors: every (project, task) collision in the workspace surfaces in one run.

Variants

Collision

More than one definition source exists for the (project, task) pair AND no unique winner under the specialisation order (DAG-006). The body cannot be resolved; the workspace MUST be rejected.

Fields

project: ProjectName

The project the collision applies to.

task: TaskName

The task name the collision applies to.

sources: BTreeSet<DefinitionSource>

Every contributing definition source for the pair. Per DAG-005 a project-level source, when present, always wins; therefore in practice this set contains only DefinitionSource::Overlay variants.

Trait Implementations

impl Clone for OverlayMergeError

fn clone(&self) -> OverlayMergeError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OverlayMergeError

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

Formats the value using the given formatter.

impl Display for OverlayMergeError

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

Formats the value using the given formatter.

impl Eq for OverlayMergeError

impl Error for OverlayMergeError

where Self: Debug + Display,

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 ErrorCompat for OverlayMergeError

fn backtrace(&self) -> Option<&Backtrace>

Returns a Backtrace that may be printed.

fn iter_chain(&self) -> ChainCompat<'_, '_>

where Self: AsErrorSource,

Returns an iterator for traversing the chain of errors, starting with the current error and continuing with recursive calls to Error::source.

impl PartialEq for OverlayMergeError

fn eq(&self, other: &OverlayMergeError) -> 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 OverlayMergeError