Module rustc_middle::traits

Trait Resolution. See the rustc dev guide for more information on how this works.

Re-exports

• pub use self::select::EvaluationCache;
• pub use self::select::EvaluationResult;
• pub use self::select::OverflowError;
• pub use self::select::SelectionCache;
• pub use self::ObligationCauseCode::*;

Modules

• query
  Experimental types for the trait query interface. The methods defined in this module are all based on canonicalization, which makes a canonical query by replacing unbound inference variables and regions, so that results can be reused more broadly. The providers for the queries defined here can be found in rustc_traits.
• select
  Candidate selection. See the rustc dev guide for more information on how this works.
• solve
• specialization_graph
• structural_impls 🔒
• util

Structs

• DerivedObligationCause
• IfExpressionCause
• ImplDerivedObligationCause
• ImplSourceUserDefinedData
  Identifies a particular impl in the source, along with a set of substitutions from the impl’s type/lifetime parameters. The nested vector corresponds to the nested obligations attached to the impl’s type parameters.
• InternedObligationCauseCode
• MatchExpressionArmCause
• ObligationCause
  The reason why we incurred this obligation; used for error reporting.
• SelectionOutputTypeParameterMismatch
• UnifyReceiverContext

Enums

• BuiltinImplSource
• CodegenObligationError
  These are the error cases for codegen_select_candidate.
• DefiningAnchor
• ImplSource
  Given the successful resolution of an obligation, the ImplSource indicates where the impl comes from.
• MethodViolationCode
  Reasons a method might not be object-safe.
• ObjectSafetyViolation
• ObligationCauseCode
• Reveal
  Depending on the stage of compilation, we want projection to be more or less conservative.
• SelectionError
• StatementAsExpression
• WellFormedLoc
  The ‘location’ at which we try to perform HIR-based wf checking. This information is used to obtain an hir::Ty, which we can walk in order to obtain precise spans for any ‘nested’ types (e.g. Foo in Option<Foo>).

Type Aliases

• SelectionResult
  When performing resolution, it is typically the case that there can be one of three outcomes: