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Scope represents a statically-describable scope that can be
used to bound the lifetime/region for values.
Node(node_id)
: Any AST node that has any scope at all has the
Node(node_id)
scope. Other variants represent special cases not
immediately derivable from the abstract syntax tree structure.
DestructionScope(node_id)
represents the scope of destructors
implicitly-attached to node_id
that run immediately after the
expression for node_id
itself. Not every AST node carries a
DestructionScope
, but those that are terminating_scopes
do;
see discussion with ScopeTree
.
Remainder { block, statement_index }
represents
the scope of user code running immediately after the initializer
expression for the indexed statement, until the end of the block.
So: the following code can be broken down into the scopes beneath:
let a = f().g( 'b: { let x = d(); let y = d(); x.h(y) } ) ;
+-+ (D12.)
+-+ (D11.)
+---------+ (R10.)
+-+ (D9.)
+----------+ (M8.)
+----------------------+ (R7.)
+-+ (D6.)
+----------+ (M5.)
+-----------------------------------+ (M4.)
+--------------------------------------------------+ (M3.)
+--+ (M2.)
+-----------------------------------------------------------+ (M1.)
(M1.): Node scope of the whole `let a = ...;` statement.
(M2.): Node scope of the `f()` expression.
(M3.): Node scope of the `f().g(..)` expression.
(M4.): Node scope of the block labeled `'b:`.
(M5.): Node scope of the `let x = d();` statement
(D6.): DestructionScope for temporaries created during M5.
(R7.): Remainder scope for block `'b:`, stmt 0 (let x = ...).
(M8.): Node scope of the `let y = d();` statement.
(D9.): DestructionScope for temporaries created during M8.
(R10.): Remainder scope for block `'b:`, stmt 1 (let y = ...).
(D11.): DestructionScope for temporaries and bindings from block `'b:`.
(D12.): DestructionScope for temporaries created during M1 (e.g. f()).
Note that while the above picture shows the destruction scopes
as following their corresponding node scopes, in the internal
data structures of the compiler the destruction scopes are
represented as enclosing parents. This is sound because we use the
enclosing parent relationship just to ensure that referenced
values live long enough; phrased another way, the starting point
of each range is not really the important thing in the above
picture, but rather the ending point.
FIXME (pnkfelix): This currently derives PartialOrd
and Ord
to
placate the same deriving in ty::FreeRegion
, but we may want to
actually attach a more meaningful ordering to scopes than the one
generated via deriving here.
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Returns a item-local id associated with this scope.
NB: likely to be replaced as API is refined; e.g. pnkfelix
anticipates fn entry_node_id
and fn each_exit_node_id
.
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Returns the span of this Scope. Note that in general the
returned span may not correspond to the span of any node id in
the AST.
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Performs copy-assignment from source
. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the minimum of two values. Read more
Feeds this value into the given [Hasher
]. Read more
Feeds a slice of this type into the given [Hasher
]. Read more
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Formats the value using the given formatter. Read more
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True if self
has any late-bound regions that are either bound by binder
or bound by some binder outside of binder
. If binder
is ty::INNERMOST
, this indicates whether there are any late-bound regions that appear free. Read more
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True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
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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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"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more
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True if there any any un-erased free regions.
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Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Read more
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True if there are any late-bound regions
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A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
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Creates owned data from borrowed data, usually by cloning. Read more
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recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
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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
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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