pub struct ItemCtxt<'a, 'tcx: 'a> {
tcx: TyCtxt<'a, 'tcx, 'tcx>,
item_def_id: DefId,
}
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Context specific to some particular item. This is what implements
AstConv. It has information about the predicates that are defined
on the trait. Unfortunately, this predicate information is
available in various different forms at various points in the
process. So we can't just store a pointer to e.g. the AST or the
parsed ty form, we have to be more flexible. To this end, the
ItemCtxt
is parameterized by a DefId
that it uses to satisfy
get_type_parameter_bounds
requests, drawing the information from
the AST (hir::Generics
), recursively.
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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Find bounds from hir::Generics. This requires scanning through the
AST. We do this to avoid having to convert all the bounds, which
would create artificial cycles. Instead we can only convert the
bounds for a type parameter X
if X::Foo
is used.
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Returns the set of bounds in scope for the type parameter with the given id. Read more
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What lifetime should we use when a lifetime is omitted (and not elided)?
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What type should we use when a type is omitted?
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Projecting an associated type from a (potentially) higher-ranked trait reference is more complicated, because of the possibility of late-bound regions appearing in the associated type binding. This is not legal in function signatures for that reason. In a function body, we can always handle it because we can use inference variables to remove the late-bound regions. Read more
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Normalize an associated type coming from the user.
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Invoked when we encounter an error from some prior pass (e.g. resolve) that is translated into a ty-error. This is used to help suppress derived errors typeck might otherwise report. Read more
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Same as ty_infer, but with a known type parameter definition.
type Error = !
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The type returned in the event of a conversion error.
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Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
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The type returned in the event of a conversion error.
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Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (get_type_id
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this method will likely be replaced by an associated static
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more
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