Struct rustc_infer::traits::ObligationCause

pub struct ObligationCause<'tcx> {
    data: Option<Rc<ObligationCauseData<'tcx>>>,
}

The reason why we incurred this obligation; used for error reporting.

As the happy path does not care about this struct, storing this on the heap ends up increasing performance.

We do not want to intern this as there are a lot of obligation causes which only live for a short period of time.

Fields

data: Option<Rc<ObligationCauseData<'tcx>>>

None for ObligationCause::dummy, Some otherwise.

Trait Implementations

impl<'tcx> ObligationCauseExt<'tcx> for ObligationCause<'tcx>

fn as_failure_code(&self, terr: &TypeError<'tcx>) -> FailureCode

fn as_requirement_str(&self) -> &'static str

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes