Struct rustc::traits::Obligation

pub struct Obligation<'tcx, T> {
    pub cause: ObligationCause<'tcx>,
    pub param_env: ParamEnv<'tcx>,
    pub recursion_depth: usize,
    pub predicate: T,
}

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An Obligation represents some trait reference (e.g. int:Eq) for which the vtable must be found. The process of finding a vtable is called "resolving" the Obligation. This process consists of either identifying an impl (e.g., impl Eq for int) that provides the required vtable, or else finding a bound that is in scope. The eventual result is usually a Selection (defined below).

Fields

cause: ObligationCause<'tcx>

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param_env: ParamEnv<'tcx>

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recursion_depth: usize

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predicate: T

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Methods

impl<'tcx, O> Obligation<'tcx, O>

pub fn new(
    cause: ObligationCause<'tcx>,
    param_env: ParamEnv<'tcx>,
    predicate: O
) -> Obligation<'tcx, O>

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pub fn misc(
    span: Span,
    body_id: NodeId,
    param_env: ParamEnv<'tcx>,
    trait_ref: O
) -> Obligation<'tcx, O>

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pub fn with<P>(&self, value: P) -> Obligation<'tcx, P>

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Trait Implementations

impl<'tcx, O: Debug> Debug for Obligation<'tcx, O>

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

Formats the value using the given formatter.

impl<'tcx, O: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Obligation<'tcx, O>

fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> Self

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fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
    &self,
    folder: &mut F
) -> Self

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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn has_regions_escaping_depth(&self, depth: u32) -> bool

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fn has_escaping_regions(&self) -> bool

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fn has_type_flags(&self, flags: TypeFlags) -> bool

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fn has_projections(&self) -> bool

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fn references_error(&self) -> bool

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fn has_param_types(&self) -> bool

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fn has_self_ty(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn needs_infer(&self) -> bool

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fn needs_subst(&self) -> bool

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fn has_re_skol(&self) -> bool

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fn has_closure_types(&self) -> bool

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fn has_erasable_regions(&self) -> bool

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fn is_normalized_for_trans(&self) -> bool

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fn is_global(&self) -> bool

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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Errs on the side of returning false.

impl<'tcx, T: Clone> Clone for Obligation<'tcx, T>

fn clone(&self) -> Obligation<'tcx, T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx, T: PartialEq> PartialEq for Obligation<'tcx, T>

fn eq(&self, __arg_0: &Obligation<'tcx, T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &Obligation<'tcx, T>) -> bool

This method tests for !=.

impl<'tcx, T: Eq> Eq for Obligation<'tcx, T>