//
// A fact is logically private to its Analysis. To pass values
// between different analyzers, use the results mechanism;
// see Analyzer.Requires, Analyzer.ResultType, and Pass.ResultOf.
//
// A Fact type must be a pointer.
// Facts are encoded and decoded using encoding/gob.
// A Fact may implement the GobEncoder/GobDecoder interfaces
// to customize its encoding. Fact encoding should not fail.
//

// N may not be immediately available.
//  - During type-checking, we allocate N before type-checking its underlying
//    type or methods, so that we may resolve recursive references.
//  - When loading from export data, we may load its methods and underlying
//    type lazily using a provided load function.
//  - After instantiating, we lazily expand the underlying type and methods

The [SetCrashOutput] function allows the user to specify an alternate
file to which the runtime should write its fatal crash report.
It may be used to construct an automated reporting mechanism for all
unexpected crashes, not just those in goroutines that explicitly use

			// pruning then it should satisfy the import invariant itself, so all of
			// its dependencies should be in its go.mod file, and if the module
			// containing the package does not support pruning then if we make it a
			// root we will load all of its (unpruned) transitive dependencies into
			// the module graph.
			//
			// (This is the “argument invariant”, and is important for

				// interface with a "child" type of it using reflection (e.g. obtain an
				// interface of T from []chan T). We need to traverse its "child" types
				// with UsedInIface attribute set.
				// When visiting the child type (chan T in the example above), it will
				// have UsedInIface set, so it in turn will mark and (re)visit its children
				// (e.g. T above).
				// We unset the reachable bit here, so if the child type is already visited,

	// We don't need this restriction anymore if we make the underlying type of a type
	// parameter its constraint interface: if the RHS is a lone type parameter, we will
	// use its underlying type (like we do for any RHS in a type declaration), and its
	// underlying type is an interface and the type declaration is well defined.
	if isTypeParam(rhs) {

		typ.iface()
	}
	return typ
}

// Obj returns the type name for the type parameter t.
func (t *TypeParam) Obj() *TypeName { return t.obj }

// Index returns the index of the type param within its param list, or -1 if
// the type parameter has not yet been bound to a type.
func (t *TypeParam) Index() int {
	return t.index
}

// Constraint returns the type constraint specified for t.

// If a is not an instance of a generic alias, Origin returns a.
func (a *Alias) Origin() *Alias { return a.orig }

// TypeParams returns the type parameters of the alias type a, or nil.
// A generic Alias and its instances have the same type parameters.
func (a *Alias) TypeParams() *TypeParamList { return a.tparams }

// SetTypeParams sets the type parameters of the alias type a.
// The alias a must not have type arguments.

// needed, and updates its state to reflect the given flags.
//
// The imports of the returned *loadPkg will be loaded asynchronously in the
// ld.work queue, and its test (if requested) will also be populated once
// imports have been resolved. When ld.work goes idle, all transitive imports of
// the requested package (and its test, if requested) will have been loaded.

The new [GODEBUG setting](/doc/godebug) [`asynctimerchan=1`](/pkg/time/#NewTimer)
can be used to revert back to asynchronous channel behaviors