enum ThunkRepr {
    Suspended {
        lambda: Rc<Lambda>,
        upvalues: Rc<Upvalues>,
        light_span: LightSpan,
    },
    Native(SuspendedNative),
    Blackhole {
        forced_at: LightSpan,
        suspended_at: Option<LightSpan>,
        content_span: Option<Span>,
    },
    Evaluated(Value),
}
Expand description

Internal representation of the different states of a thunk.

Upvalues must be finalised before leaving the initial state (Suspended or RecursiveClosure). The [value()] function may not be called until the thunk is in the final state (Evaluated).

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Suspended

Fields

§lambda: Rc<Lambda>
§upvalues: Rc<Upvalues>
§light_span: LightSpan

Thunk is closed over some values, suspended and awaiting execution.

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Native(SuspendedNative)

Thunk is a suspended native computation.

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Blackhole

Fields

§forced_at: LightSpan

Span at which the thunk was first forced.

§suspended_at: Option<LightSpan>

Span at which the thunk was originally suspended.

§content_span: Option<Span>

Span of the first instruction of the actual code inside the thunk.

Thunk currently under-evaluation; encountering a blackhole value means that infinite recursion has occured.

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Evaluated(Value)

Fully evaluated thunk.

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impl ThunkRepr

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fn debug_repr(&self) -> String

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fn expect(self) -> Value

Return the Value within a fully-evaluated ThunkRepr; panics if the thunk is not fully-evaluated.

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fn expect_ref(&self) -> &Value

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pub fn is_forced(&self) -> bool

Trait Implementations§

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impl Debug for ThunkRepr

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V