Enum UnfoldError 

pub enum UnfoldError {
    UnknownFunction(Ident),
    UnknownAccessor(Ident),
    NoDeconstructor {
        func: Ident,
        target: String,
    },
    AccessorTargetMismatch {
        accessor: String,
        takes: String,
        expected: String,
    },
    MultipleIdentity {
        target: String,
    },
    Cycle {
        target: String,
    },
    ConvertNotSingle {
        func: Ident,
        reason: &'static str,
    },
    RecordNotAccessor {
        func: Ident,
    },
    Unsupported {
        func: Ident,
        reason: &'static str,
    },
    DuplicateLeafName {
        target: String,
        name: String,
    },
    ReservedSeparator {
        name: String,
    },
    RootIdentityBeforeNested {
        target: String,
    },
    ReturnTypeMismatch {
        func: Ident,
        declared: String,
        actual: String,
    },
    InvalidDeclarations {
        entries: Vec<UnfoldDeclError>,
    },
}

Errors surfaced while resolving Deconstructors.

Variants

UnknownFunction(Ident)

UnknownAccessor(Ident)

NoDeconstructor

Fields

func: Ident

target: String

AccessorTargetMismatch

Fields

accessor: String

takes: String

expected: String

MultipleIdentity

Fields

target: String

Cycle

A nested deconstructor recurses back into a type already on the nesting chain (A → … → A).

Fields

target: String

ConvertNotSingle

A single-value (Return) delivery on a decomposition that does not flatten to exactly one leaf, or whose shape is Iterable.

Fields

func: Ident

reason: &'static str

RecordNotAccessor

A decomposer record references a function that was not declared via .accessor.

Fields

func: Ident

Unsupported

A shape / record kind not yet implemented.

Fields

func: Ident

reason: &'static str

DuplicateLeafName

Two leaves of one deconstructor resolved to the same (literal) name. Author leaf names are explicit and emitted verbatim, so a collision is a declaration bug — never auto-resolved.

Fields

target: String

name: String

ReservedSeparator

An author-supplied leaf name contains the reserved "__" chain separator (used internally to join nested deconstructor segments).

Fields

name: String

RootIdentityBeforeNested

An owned decomposition declared .field_self() (the root identity, which MOVES the value) before a field that splices a nested identity (which borrows it) — the generated Rust would not compile.

Fields

target: String

ReturnTypeMismatch

A per-fn .expand_return(expand_return!(T)…) decl whose T does not match the function’s peeled return type.

Fields

func: Ident

declared: String

actual: String

InvalidDeclarations

Structurally invalid declaration records — empty record lists or duplicate targets. All offenders are collected before failing (mirrors ScanError::DeclaredNotFound).

Fields

entries: Vec<UnfoldDeclError>

Trait Implementations

impl Debug for UnfoldError

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

Formats the value using the given formatter.

impl Display for UnfoldError

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

Formats the value using the given formatter.

impl Error for UnfoldError

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<UnfoldError> for WriteRustError

fn from(e: UnfoldError) -> Self

Converts to this type from the input type.