Enum PlanLowerError 

#[non_exhaustive]
pub enum PlanLowerError {
    UnresolvedName {
        name: SmolStr,
        span: HirSpan,
    },
    UndesugaredExpr {
        kind: &'static str,
        span: HirSpan,
    },
    EmptyPatternPart {
        span: HirSpan,
    },
}

A precondition violation detected by HIR → Plan lowering.

lower_statement requires its input to have been name-resolved (cyrs-sema::resolve / cy-b4b) and desugared (cyrs_hir::desugar::desugar_statement / cy-mla). The variants below describe the kinds of precondition violation the entry point detects.

This enum is #[non_exhaustive]: callers must include a wildcard arm to remain forward-compatible (spec cy-2i9.1 precedent).

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

UnresolvedName

An cyrs_hir::Expr::Unresolved node survived into plan lowering — name resolution must run first (cy-b4b). The variable name is preserved for diagnostics.

Fields

name: SmolStr

The identifier that was never resolved to a cyrs_hir::VarId.

span: HirSpan

Approximate span of the offending clause. The HIR does not carry per-expression spans, so this is the clause span that contained the unresolved reference.

UndesugaredExpr

An expression that must be desugared before plan lowering survived into the entry point (cy-mla). Possible kind values are "ListComprehension", "MapProjection", and "PatternPredicate".

Fields

kind: &'static str

The name of the offending HIR expression variant.

span: HirSpan

Approximate span of the offending clause (see Self::UnresolvedName::span for why this is clause-scoped).

EmptyPatternPart

A cyrs_hir::PatternPart reached the lowerer with no cyrs_hir::PatternElements, or with a malformed element sequence the Source + Expand translation cannot walk (cy-f2t).

The parser’s error-recovery pass can emit such pattern parts for inputs where the pattern is syntactically incomplete (e.g. a bare MATCH keyword, or an open MATCH ( with no close). The previous lowerer assumed every part starts with a cyrs_hir::PatternElement::Node and panicked on the empty / leading-Rel case; this variant surfaces the recovery-produced shape as a clean error.

Fields

span: HirSpan

Approximate span of the offending clause (see Self::UnresolvedName::span for why this is clause-scoped).

Trait Implementations

impl Clone for PlanLowerError

fn clone(&self) -> PlanLowerError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PlanLowerError

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

Formats the value using the given formatter.

impl Display for PlanLowerError

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

Formats the value using the given formatter.

impl Error for PlanLowerError

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 PartialEq for PlanLowerError

fn eq(&self, other: &PlanLowerError) -> 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 Eq for PlanLowerError

impl StructuralPartialEq for PlanLowerError