Struct rustc_typeck::check::regionck::RegionCtxt[][src]

pub struct RegionCtxt<'a, 'gcx: 'a + 'tcx, 'tcx: 'a> {
    pub fcx: &'a FnCtxt<'a, 'gcx, 'tcx>,
    pub region_scope_tree: Lrc<ScopeTree>,
    outlives_environment: OutlivesEnvironment<'tcx>,
    body_id: NodeId,
    call_site_scope: Option<Scope>,
    repeating_scope: NodeId,
    subject_def_id: DefId,
}
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Fields

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Methods

impl<'a, 'gcx, 'tcx> RegionCtxt<'a, 'gcx, 'tcx>
[src]

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Try to resolve the type for the given node, returning t_err if an error results. Note that we never care about the details of the error, the same error will be detected and reported in the writeback phase.

Note one important point: we do not attempt to resolve region variables here. This is because regionck is essentially adding constraints to those region variables and so may yet influence how they are resolved.

Consider this silly example:

fn borrow(x: &i32) -> &i32 {x}
fn foo(x: @i32) -> i32 {  // block: B
    let b = borrow(x);    // region: <R0>
    *b
}

Here, the region of b will be <R0>. <R0> is constrained to be some subregion of the block B and some superregion of the call. If we forced it now, we'd choose the smaller region (the call). But that would make the *b illegal. Since we don't resolve, the type of b will be &<R0>.i32 and then *b will require that <R0> be bigger than the let and the *b expression, so we will effectively resolve <R0> to be the block B.

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Try to resolve the type for the given node.

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Try to resolve the type for the given node.

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This is the "main" function when region-checking a function item or a closure within a function item. It begins by updating various fields (e.g., call_site_scope and outlives_environment) to be appropriate to the function and then adds constraints derived from the function body.

Note that it does not restore the state of the fields that it updates! This is intentional, since -- for the main function -- we wish to be able to read the final outlives_environment and other fields from the caller. For closures, however, we save and restore any "scoped state" before we invoke this function. (See visit_fn in the intravisit::Visitor impl below.)

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impl<'a, 'gcx, 'tcx> RegionCtxt<'a, 'gcx, 'tcx>
[src]

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Invoked on every call site (i.e., normal calls, method calls, and overloaded operators). Constrains the regions which appear in the type of the function. Also constrains the regions that appear in the arguments appropriately.

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Create a temporary MemCategorizationContext and pass it to the closure.

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Invoked on any adjustments that occur. Checks that if this is a region pointer being dereferenced, the lifetime of the pointer includes the deref expr.

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Invoked on any index expression that occurs. Checks that if this is a slice being indexed, the lifetime of the pointer includes the deref expr.

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Guarantees that any lifetimes which appear in the type of the node id (after applying adjustments) are valid for at least minimum_lifetime

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Adds constraints to inference such that T: 'a holds (or reports an error if it cannot).

Parameters

  • origin, the reason we need this constraint
  • ty, the type T
  • region, the region 'a
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Computes the guarantor for an expression &base and then ensures that the lifetime of the resulting pointer is linked to the lifetime of its guarantor (if any).

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Computes the guarantors for any ref bindings in a let and then ensures that the lifetime of the resulting pointer is linked to the lifetime of the initialization expression.

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Computes the guarantors for any ref bindings in a match and then ensures that the lifetime of the resulting pointer is linked to the lifetime of its guarantor (if any).

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Computes the guarantors for any ref bindings in a match and then ensures that the lifetime of the resulting pointer is linked to the lifetime of its guarantor (if any).

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Link lifetimes of any ref bindings in root_pat to the pointers found in the discriminant, if needed.

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Link lifetime of borrowed pointer resulting from autoref to lifetimes in the value being autoref'd.

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Like link_region(), except that the region is extracted from the type of id, which must be some reference (&T, &str, etc).

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Informs the inference engine that borrow_cmt is being borrowed with kind borrow_kind and lifetime borrow_region. In order to ensure borrowck is satisfied, this may create constraints between regions, as explained in link_reborrowed_region().

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This is the most complicated case: the path being borrowed is itself the referent of a borrowed pointer. Let me give an example fragment of code to make clear(er) the situation:

let r: &'a mut T = ...; // the original reference "r" has lifetime 'a ... &'z *r // the reborrow has lifetime 'z

Now, in this case, our primary job is to add the inference constraint that 'z <= 'a. Given this setup, let's clarify the parameters in (roughly) terms of the example:

    A borrow of: `& 'z bk * r` where `r` has type `& 'a bk T`
    borrow_region   ^~                 ref_region    ^~
    borrow_kind        ^~               ref_kind        ^~
    ref_cmt                 ^

Here bk stands for some borrow-kind (e.g., mut, uniq, etc).

Unfortunately, there are some complications beyond the simple scenario I just painted:

  1. The reference r might in fact be a "by-ref" upvar. In that case, we have two jobs. First, we are inferring whether this reference should be an &T, &mut T, or &uniq T reference, and we must adjust that based on this borrow (e.g., if this is an &mut borrow, then r must be an &mut reference). Second, whenever we link two regions (here, 'z <= 'a), we supply a cause, and in this case we adjust the cause to indicate that the reference being "reborrowed" is itself an upvar. This provides a nicer error message should something go wrong.

  2. There may in fact be more levels of reborrowing. In the example, I said the borrow was like &'z *r, but it might in fact be a borrow like &'z **q where q has type &'a &'b mut T. In that case, we want to ensure that 'z <= 'a and 'z <= 'b. This is explained more below.

The return value of this function indicates whether we need to recurse and process ref_cmt (see case 2 above).

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Checks that the values provided for type/region arguments in a given expression are well-formed and in-scope.

Methods from Deref<Target = FnCtxt<'a, 'gcx, 'tcx>>

Important traits for Autoderef<'a, 'gcx, 'tcx>

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The is_arg argument indicates whether this pattern is the outermost pattern in an argument (e.g., in fn foo(&x: &u32), it is true for the &x pattern but not x). This is used to tailor error reporting.

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Region checking during the WF phase for items. wf_tys are the types from which we should derive implied bounds, if any.

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Region check a function body. Not invoked on closures, but only on the "root" fn item (in which closures may be embedded). Walks the function body and adds various add'l constraints that are needed for region inference. This is separated both to isolate "pure" region constraints from the rest of type check and because sometimes we need type inference to have completed before we can determine which constraints to add.

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Attempt to coerce an expression to a type, and return the adjusted type of the expression, if successful. Adjustments are only recorded if the coercion succeeded. The expressions must not have any pre-existing adjustments.

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Same as try_coerce(), but without side-effects.

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Given some expressions, their known unified type and another expression, tries to unify the types, potentially inserting coercions on any of the provided expressions and returns their LUB (aka "common supertype").

This is really an internal helper. From outside the coercion module, you should instantiate a CoerceMany instance.

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Important traits for Vec<u8>

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Identify some cases where as_ref() would be appropriate and suggest it.

Given the following code:

struct Foo;
fn takes_ref(_: &Foo) {}
let ref opt = Some(Foo);

opt.map(|arg| takes_ref(arg));

Suggest using opt.as_ref().map(|arg| takes_ref(arg)); instead.

It only checks for Option and Result and won't work with

opt.map(|arg| { takes_ref(arg) });

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This function is used to determine potential "simple" improvements or users' errors and provide them useful help. For example:

fn some_fn(s: &str) {}

let x = "hey!".to_owned();
some_fn(x); // error

No need to find every potential function which could make a coercion to transform a String into a &str since a & would do the trick!

In addition of this check, it also checks between references mutability state. If the expected is mutable but the provided isn't, maybe we could just say "Hey, try with &mut!".

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Important traits for Vec<u8>

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This is used to offer suggestions to users. It returns methods that could have been called which have the desired return type. Some effort is made to rule out methods that, if called, would result in an error (basically, the same criteria we would use to decide if a method is a plausible fit for ambiguity purposes).

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Checks whether there is a local type somewhere in the chain of autoderefs of rcvr_ty.

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Determines whether the type self_ty supports a method name method_name or not.

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Performs method lookup. If lookup is successful, it will return the callee and store an appropriate adjustment for the self-expr. In some cases it may report an error (e.g., invoking the drop method).

Arguments

Given a method call like foo.bar::<T1,...Tn>(...):

  • fcx: the surrounding FnCtxt (!)
  • span: the span for the method call
  • method_name: the name of the method being called (bar)
  • self_ty: the (unadjusted) type of the self expression (foo)
  • supplied_method_types: the explicit method type parameters, if any (T1..Tn)
  • self_expr: the self expression (foo)

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lookup_method_in_trait is used for overloaded operators. It does a very narrow slice of what the normal probe/confirm path does. In particular, it doesn't really do any probing: it simply constructs an obligation for a particular trait with the given self-type and checks whether that trait is implemented.

FIXME(#18741) -- It seems likely that we can consolidate some of this code with the other method-lookup code. In particular, the second half of this method is basically the same as confirmation.

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Find item with name item_name defined in impl/trait def_id and return it, or None, if no such item was defined there.

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Analysis starting point.

Important traits for Vec<u8>

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Important traits for Vec<u8>

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Important traits for Vec<u8>

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Returns the kind of unsize information of t, or None if t is unknown.

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Given the expected type, figures out what it can about this closure we are about to type check:

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Given a projection like "<F as Fn(X)>::Result == Y", we can deduce everything we need to know about a closure.

The cause_span should be the span that caused us to have this expected signature, or None if we can't readily know that.

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If there is no expected signature, then we will convert the types that the user gave into a signature.

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Invoked to compute the signature of a closure expression. This combines any user-provided type annotations (e.g., |x: u32| -> u32 { .. }) with the expected signature.

The approach is as follows:

  • Let S be the (higher-ranked) signature that we derive from the user's annotations.
  • Let E be the (higher-ranked) signature that we derive from the expectations, if any.
    • If we have no expectation E, then the signature of the closure is S.
    • Otherwise, the signature of the closure is E. Moreover:
      • Skolemize the late-bound regions in E, yielding E'.
      • Instantiate all the late-bound regions bound in the closure within S with fresh (existential) variables, yielding S'
      • Require that E' = S'
        • We could use some kind of subtyping relationship here, I imagine, but equality is easier and works fine for our purposes.

The key intuition here is that the user's types must be valid from "the inside" of the closure, but the expectation ultimately drives the overall signature.

Examples

fn with_closure<F>(_: F)
  where F: Fn(&u32) -> &u32 { .. }

with_closure(|x: &u32| { ... })

Here:

  • E would be fn(&u32) -> &u32.
  • S would be `fn(&u32) ->
  • E' is &'!0 u32 -> &'!0 u32
  • S' is &'?0 u32 -> ?T

S' can be unified with E' with ['?0 = '!0, ?T = &'!10 u32].

Arguments

  • expr_def_id: the def-id of the closure expression
  • decl: the HIR declaration of the closure
  • body: the body of the closure
  • expected_sig: the expected signature (if any). Note that this is missing a binder: that is, there may be late-bound regions with depth 1, which are bound then by the closure.

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Enforce the user's types against the expectation. See sig_of_closure_with_expectation for details on the overall strategy.

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If there is no expected signature, then we will convert the types that the user gave into a signature.

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Converts the types that the user supplied, in case that doing so should yield an error, but returns back a signature where all parameters are of type TyErr.

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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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🔬 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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Check a a <op>= b

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Check a potentially overloaded binary operator.

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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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Produce warning on the given node, if the current point in the function is unreachable, and there hasn't been another warning.

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Resolves type variables in ty if possible. Unlike the infcx version (resolve_type_vars_if_possible), this version will also select obligations if it seems useful, in an effort to get more type information.

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Important traits for Vec<u8>

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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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Basically whenever we are converting from a type scheme into the fn body space, we always want to normalize associated types as well. This function combines the two.

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As instantiate_type_scheme, but for the bounds found in a generic type scheme.

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Replace the anonymized types from the return value of the function with type variables and records the AnonTypeMap for later use during writeback. See InferCtxt::instantiate_anon_types for more details.

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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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🔬 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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Registers an obligation for checking later, during regionck, that the type ty must outlive the region r.

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Registers obligations that all types appearing in substs are well-formed.

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Given a fully substituted set of bounds (generic_bounds), and the values with which each type/region parameter was instantiated (substs), creates and registers suitable trait/region obligations.

For example, if there is a function:

fn foo<'a,T:'a>(...)

and a reference:

let f = foo;

Then we will create a fresh region variable '$0 and a fresh type variable $1 for 'a and T. This routine will add a region obligation $1:'$0 and register it locally.

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Select as many obligations as we can at present.

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For the overloaded place expressions (*x, x[3]), the trait returns a type of &T, but the actual type we assign to the expression is T. So this function just peels off the return type by one layer to yield T.

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To type-check base_expr[index_expr], we progressively autoderef (and otherwise adjust) base_expr, looking for a type which either supports builtin indexing or overloaded indexing. This loop implements one step in that search; the autoderef loop is implemented by lookup_indexing.

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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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Generic function that factors out common logic from function calls, method calls and overloaded operators.

Important traits for Vec<u8>

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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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🔬 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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🔬 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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🔬 This is a nightly-only experimental API. (rustc_private)

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Important traits for Vec<u8>

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Unifies the output type with the expected type early, for more coercions and forward type information on the input expressions.

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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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Important traits for Vec<u8>

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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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🔬 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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Invariant: If an expression has any sub-expressions that result in a type error, inspecting that expression's type with ty.references_error() will return true. Likewise, if an expression is known to diverge, inspecting its type with ty::type_is_bot will return true (n.b.: since Rust is strict, | can appear in the type of an expression that does not, itself, diverge: for example, fn() -> |.) Note that inspecting a type's structure directly may expose the fact that there are actually multiple representations for TyError, so avoid that when err needs to be handled differently.

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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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🔬 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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🔬 This is a nightly-only experimental API. (rustc_private)

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Given a NodeId, return the FnDecl of the method it is enclosed by and whether a suggestion can be made, None otherwise.

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On implicit return expressions with mismatched types, provide the following suggestions:

  • Point out the method's return type as the reason for the expected type
  • Possible missing semicolon
  • Possible missing return type if the return type is the default, and not fn main()

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A common error is to forget to add a semicolon at the end of a block:

fn foo() {
    bar_that_returns_u32()
}

This routine checks if the return expression in a block would make sense on its own as a statement and the return type has been left as default or has been specified as (). If so, it suggests adding a semicolon.

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A possible error is to forget to add a return type that is needed:

fn foo() {
    bar_that_returns_u32()
}

This routine checks if the return type is left as default, the method is not part of an impl block and that it isn't the main method. If so, it suggests setting the return type.

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A common error is to add an extra semicolon:

fn foo() -> usize {
    22;
}

This routine checks if the final statement in a block is an expression with an explicit semicolon whose type is compatible with expected_ty. If so, it suggests removing the semicolon.

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Report errors if the provided parameters are too few or too many.

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Report error if there is an explicit type parameter when using impl Trait.

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🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Trait Implementations

impl<'a, 'gcx, 'tcx> Deref for RegionCtxt<'a, 'gcx, 'tcx>
[src]

The resulting type after dereferencing.

Dereferences the value.

impl<'a, 'gcx, 'tcx> Visitor<'gcx> for RegionCtxt<'a, 'gcx, 'tcx>
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

The default versions of the visit_nested_XXX routines invoke this method to get a map to use. By selecting an enum variant, you control which kinds of nested HIR are visited; see NestedVisitorMap for details. By "nested HIR", we are referring to bits of HIR that are not directly embedded within one another but rather indirectly, through a table in the crate. This is done to control dependencies during incremental compilation: the non-inline bits of HIR can be tracked and hashed separately. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Invoked when a nested item is encountered. By default does nothing unless you override nested_visit_map to return Some(_), in which case it will walk the item. You probably don't want to override this method -- instead, override nested_visit_map or use the "shallow" or "deep" visit patterns described on itemlikevisit::ItemLikeVisitor. The only reason to override this method is if you want a nested pattern but cannot supply a Map; see nested_visit_map for advice. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Like visit_nested_item(), but for trait items. See visit_nested_item() for advice on when to override this method. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Like visit_nested_item(), but for impl items. See visit_nested_item() for advice on when to override this method. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Invoked to visit the body of a function, method or closure. Like visit_nested_item, does nothing by default unless you override nested_visit_map to return Some(_), in which case it will walk the body. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Visit the top-level item and (optionally) nested items / impl items. See visit_nested_item for details. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

When invoking visit_all_item_likes(), you need to supply an item-like visitor. This method converts a "intra-visit" visitor into an item-like visitor that walks the entire tree. If you use this, you probably don't want to process the contents of nested item-like things, since the outer loop will visit them as well. Read more

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Auto Trait Implementations

impl<'a, 'gcx, 'tcx> !Send for RegionCtxt<'a, 'gcx, 'tcx>

impl<'a, 'gcx, 'tcx> !Sync for RegionCtxt<'a, 'gcx, 'tcx>