109 lines
3.7 KiB
Rust
109 lines
3.7 KiB
Rust
use super::*;
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type Fwa<'a, A, E0, E1, Fallible> = <<Fallible as MonadFailAny>::T as WeakFunctor>::F<
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'a,
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Result<<<Fallible as MonadFailAny>::W<E0> as WeakFunctor>::F<'a, A>, E1>,
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>;
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pub trait SpeculativeFail: MonadFailAny {
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fn _speculative_a_wb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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a: Result<A, E0>,
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wb: Result<<Self::W<E0> as WeakFunctor>::F<'a, B>, E1>,
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) -> <Self::W<Result<E0, E1>> as WeakFunctor>::F<'a, (A, B)>
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where
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Self: 'a,
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{
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match wb {
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Ok(wb) => match a {
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Ok(a) => Self::map_err(<Self::W<E0> as Functor>::fmap(|b| (a, b), wb), Ok),
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Err(e0) => Self::fail(Ok(e0)),
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},
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Err(e1) => Self::fail(Err(e1)),
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}
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}
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fn _speculative_a_fwb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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a: Result<A, E0>,
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fwb: Fwa<'a, B, E0, E1, Self>,
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) -> <Self::W<Result<E0, E1>> as WeakFunctor>::F<'a, (A, B)>
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where
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Self: 'a,
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{
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Self::stuff(<Self::T as Monad>::bind(fwb, |wb| {
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Self::unstuff(Self::_speculative_a_wb(a, wb))
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}))
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}
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fn _speculative_fa_wb<'a, A: 'a, B: 'a, E0: 'a>(
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fa: <Self::T as WeakFunctor>::F<'a, Result<A, E0>>,
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wb: <Self::W<E0> as WeakFunctor>::F<'a, B>,
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) -> <Self::W<E0> as WeakFunctor>::F<'a, (A, B)>
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where
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Self: 'a,
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{
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<Self::W<E0> as ApplicativeTuple>::tuple((Self::stuff(fa), wb))
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}
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fn _speculative_wa_fwb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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wa: <Self::W<E0> as WeakFunctor>::F<'a, A>,
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fwb: Fwa<'a, B, E0, E1, Self>,
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) -> <Self::W<Result<E0, E1>> as WeakFunctor>::F<'a, (A, B)>
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where
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Self: 'a,
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{
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Self::stuff(<<Self as MonadFailAny>::T as Monad>::join(
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<<Self as MonadFailAny>::T as Functor>::fmap(
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Self::unstuff,
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<Self::T as ApplicativeSelect>::select(
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|selected| match selected {
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Selected::A(a, fwb) => Self::_speculative_a_fwb(a, fwb),
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Selected::B(fa, Ok(wb)) => {
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Self::map_err(Self::_speculative_fa_wb(fa, wb), Ok)
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}
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Selected::B(_, Err(e1)) => Self::fail(Err(e1)),
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},
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Self::unstuff(wa),
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fwb,
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),
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),
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))
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}
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fn _speculative_fwa_wb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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fwa: Fwa<'a, A, E0, E1, Self>,
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wb: <Self::W<E0> as WeakFunctor>::F<'a, B>,
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) -> <Self::W<Result<E0, E1>> as WeakFunctor>::F<'a, (A, B)>
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where
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Self: 'a,
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{
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<Self::W<Result<E0, E1>> as Functor>::fmap(
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|(b, a)| (a, b),
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Self::_speculative_wa_fwb(wb, fwa),
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)
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}
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fn speculative<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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wwa: <Self::W<E1> as WeakFunctor>::F<'a, <Self::W<E0> as WeakFunctor>::F<'a, A>>,
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wwb: <Self::W<E1> as WeakFunctor>::F<'a, <Self::W<E0> as WeakFunctor>::F<'a, B>>,
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) -> <Self::W<Result<E0, E1>> as WeakFunctor>::F<'a, (A, B)>
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where
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Self: 'a,
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{
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Self::stuff(<Self::T as Monad>::join(<Self::T as Functor>::fmap(
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Self::unstuff,
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<Self::T as ApplicativeSelect>::select(
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|selected| match selected {
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Selected::A(Ok(wa), fwb) => Self::_speculative_wa_fwb(wa, fwb),
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Selected::A(Err(e1), _) => Self::fail(Err(e1)),
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Selected::B(fwa, Ok(wb)) => Self::_speculative_fwa_wb(fwa, wb),
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Selected::B(_, Err(e1)) => Self::fail(Err(e1)),
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},
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Self::unstuff(wwa),
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Self::unstuff(wwb),
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),
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)))
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}
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}
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impl<Fallible: ?Sized + MonadFailAny> SpeculativeFail for Fallible {}
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