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Describe RPIT parameter capturing #514

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Jul 8, 2024
Merged

Describe RPIT parameter capturing #514

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0761782
Describe RPIT parameter capturing
Veykril Jul 8, 2024
45921f4
Update src/changelog.rst
Veykril Jul 8, 2024
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2 changes: 1 addition & 1 deletion src/changelog.rst
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Expand Up @@ -82,7 +82,7 @@ Language changes in Rust 1.79.0

* `Rework \`impl Trait\` lifetime inference <https://github.com/rust-lang/rust/pull/116891/>`_

* No change: capturing of lifestime within ``impl Trait`` types is not described in the FLS
* New paragraphs: :p:`fls_3aKZB0ILIkZw`, :p:`fls_Xo1ODwOyX7Vm`, :p:`fls_kTGFLFymTWch`

* `Change inductive trait solver cycles to be ambiguous <https://github.com/rust-lang/rust/pull/122791>`_

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15 changes: 15 additions & 0 deletions src/types-and-traits.rst
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Expand Up @@ -1123,6 +1123,21 @@ An :t:`impl trait type` is a :t:`type` that implements a :t:`trait`, where the
An :t:`impl trait type` shall appear only within a :t:`function parameter` or
the :t:`return type` of a :t:`function`.

:dp:`fls_3aKZB0ILIkZw`
An :t:`anonymous return type` is an :t:`impl trait type` ascribed to a
:t:`function` :t:`return type`.

:dp:`fls_Xo1ODwOyX7Vm`
An :t:`anonymous return type` behaves as if it contained all declared :t:`[type
parameter]s` of the :t:`return type`'s :t:`function` and its parent :t:`trait`
or :t:`implementation`.

:dp:`fls_kTGFLFymTWch`
An :t:`anonymous return type` derived from an :t:`async function` behaves as if
it contained all declared :t:`[type parameter]s` and :t:`[lifetime parameter]s`
of the :t:`return type`'s :t:`function` and its parent :t:`trait` or
:t:`implementation`.

:dp:`fls_ECjhEI7eCwAj`
An :t:`impl trait type` shall not contain :t:`[opt-out trait bound]s`.

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