109 lines
3.5 KiB
Rust
109 lines
3.5 KiB
Rust
use super::*;
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type Frwa<'a, A, E0, E1, Fallible> =
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Wrap<'a, Result<WrapE<'a, A, E0, Fallible>, E1>, <Fallible as MonadFailAny>::T>;
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type Wwa<'a, A, E0, E1, Fallible> = WrapE<'a, WrapE<'a, A, E0, Fallible>, E1, Fallible>;
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pub trait SpeculativeFail: MonadFailAny {
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fn _speculative_ra_rwb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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ra: Result<A, E0>,
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rwb: Result<WrapE<'a, B, E0, Self>, E1>,
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) -> WrapE<'a, (A, B), Result<E0, E1>, Self>
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where
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Self: 'a,
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{
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match rwb {
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Ok(wb) => match ra {
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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_ra_frwb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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ra: Result<A, E0>,
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frwb: Frwa<'a, B, E0, E1, Self>,
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) -> WrapE<'a, (A, B), Result<E0, E1>, Self>
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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(frwb, |rwb| {
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Self::unstuff(Self::_speculative_ra_rwb(ra, rwb))
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}))
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}
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fn _speculative_fra_wb<'a, A: 'a, B: 'a, E0: 'a>(
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fra: Wrap<'a, Result<A, E0>, Self::T>,
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wb: WrapE<'a, B, E0, Self>,
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) -> WrapE<'a, (A, B), E0, Self>
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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(fra), wb))
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}
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fn _speculative_wa_frwb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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wa: WrapE<'a, A, E0, Self>,
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frwb: Frwa<'a, B, E0, E1, Self>,
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) -> WrapE<'a, (A, B), Result<E0, E1>, Self>
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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::select_map(
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|selected| match selected {
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Selected::A(ra, frwb) => Self::_speculative_ra_frwb(ra, frwb),
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Selected::B(fra, Ok(wb)) => {
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Self::map_err(Self::_speculative_fra_wb(fra, 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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frwb,
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),
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),
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))
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}
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fn _speculative_frwa_wb<'a, A: 'a, B: 'a, E0: 'a, E1: 'a>(
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frwa: Frwa<'a, A, E0, E1, Self>,
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wb: WrapE<'a, B, E0, Self>,
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) -> WrapE<'a, (A, B), Result<E0, E1>, Self>
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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_frwb(wb, frwa),
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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: Wwa<'a, A, E0, E1, Self>,
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wwb: Wwa<'a, B, E0, E1, Self>,
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) -> WrapE<'a, (A, B), Result<E0, E1>, Self>
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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::select_map(
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|selected| match selected {
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Selected::A(Ok(wa), frwb) => Self::_speculative_wa_frwb(wa, frwb),
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Selected::A(Err(e1), _) => Self::fail(Err(e1)),
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Selected::B(frwa, Ok(wb)) => Self::_speculative_frwa_wb(frwa, 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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