Module rustc_trait_selection::infer

Modules

at	A nice interface for working with the infcx. The basic idea is to do infcx.at(cause, param_env), which sets the "cause" of the operation as well as the surrounding parameter environment. Then you can do something like .sub(a, b) or .eq(a, b) to create a subtype or equality relationship respectively. The first argument is always the "expected" output from the POV of diagnostics.
canonical	Canonicalization is the key to constructing a query in the middle of type inference. Ordinarily, it is not possible to store types from type inference in query keys, because they contain references to inference variables whose lifetimes are too short and so forth. Canonicalizing a value T1 using canonicalize_query produces two things:
error_reporting	Error Reporting Code for the inference engine
free_regions	This module handles the relationships between "free regions", i.e., lifetime parameters. Ordinarily, free regions are unrelated to one another, but they can be related via implied or explicit bounds. In that case, we track the bounds using the TransitiveRelation type, and use that to decide when one free region outlives another, and so forth.
lattice	Lattice Variables
nll_relate	This code is kind of an alternate way of doing subtyping, supertyping, and type equating, distinct from the combine.rs code but very similar in its effect and design. Eventually the two ought to be merged. This code is intended for use in NLL and chalk.
outlives	Various code related to computing outlives relations.
region_constraints	See README.md.
resolve
type_variable
unify_key

Structs

CombinedSnapshot
InferCtxt
InferCtxtBuilder	Helper type of a temporary returned by tcx.infer_ctxt(). Necessary because we can't write the following bound: F: for<'b, 'tcx> where 'tcx FnOnce(InferCtxt<'b, 'tcx>).
InferCtxtInner	This type contains all the things within InferCtxt that sit within a RefCell and are involved with taking/rolling back snapshots. Snapshot operations are hot enough that we want only one call to borrow_mut per call to start_snapshot and rollback_to.
InferOk
RegionObligation	See the region_obligations field for more information.
TypeFreshener
TypeTrace	The trace designates the path through inference that we took to encounter an error or subtyping constraint.

Enums

FixupError
IntVarValue
LateBoundRegionConversionTime	Times when we replace late-bound regions with variables:
NLLRegionVariableOrigin
RegionVariableOrigin	Reasons to create a region inference variable
RegionckMode	How we should handle region solving.
SubregionOrigin	The origin of a r1 <= r2 constraint.
TyOrConstInferVar	Helper for ty_or_const_infer_var_changed (see comment on that), currently used only for traits::fulfill's list of stalled_on inference variables.
ValuePairs	See the error_reporting module for more details.

Traits

InferCtxtBuilderExt
InferCtxtExt
OutlivesEnvironmentExt
TyCtxtInferExt

Type Definitions

Bound
FixupResult
InferResult
UnitResult