// type with TypeArgs results in an identical instance.
				ptype := useMap[inst.Ident].Type()
				lister, _ := ptype.(interface{ TypeParams() *TypeParamList })
				if lister == nil || lister.TypeParams().Len() == 0 {
					t.Fatalf("info.Types[%v] = %v, want parameterized type", inst.Ident, ptype)
				}
				inst2, err := Instantiate(nil, ptype, targs, true)
				if err != nil {

}

func evacuated(b *bmap) bool {
	h := b.tophash[0]
	return h > emptyOne && h < minTopHash
}

func (b *bmap) overflow(t *maptype) *bmap {
	return *(**bmap)(add(unsafe.Pointer(b), uintptr(t.BucketSize)-goarch.PtrSize))
}

func (b *bmap) setoverflow(t *maptype, ovf *bmap) {
	*(**bmap)(add(unsafe.Pointer(b), uintptr(t.BucketSize)-goarch.PtrSize)) = ovf
}

func (b *bmap) keys() unsafe.Pointer {

}

func (t *interfaceType) common() *abi.Type {
	return &t.Type
}

func (t *interfaceType) uncommon() *abi.UncommonType {
	return t.Uncommon()
}

// mapType represents a map type.
type mapType struct {
	abi.MapType
}

// ptrType represents a pointer type.
type ptrType struct {
	abi.PtrType
}

// sliceType represents a slice type.
type sliceType struct {
	abi.SliceType

		*ast.IndexExpr,
		*ast.SliceExpr,
		*ast.TypeAssertExpr,
		*ast.StarExpr,
		*ast.KeyValueExpr,
		*ast.ArrayType,
		*ast.StructType,
		*ast.FuncType,
		*ast.InterfaceType,
		*ast.MapType,
		*ast.ChanType:
		// These expression are never untyped - nothing to do.
		// The respective sub-expressions got their final types
		// upon assignment or use.
		if debug {

			// the decision towards a type parameter list.
			if pname, ptype := extractName(x, p.tok == _Comma); pname != nil && (ptype != nil || p.tok != _Rbrack) {
				// d.Name "[" pname ...
				// d.Name "[" pname ptype ...
				// d.Name "[" pname ptype "," ...
				d.TParamList = p.paramList(pname, ptype, _Rbrack, true) // ptype may be nil
				d.Alias = p.gotAssign()
				d.Type = p.typeOrNil()
			} else {

		// constants to the parameter type, to avoid a type mismatch.
		ptype := p.rewriteUnsafe(param.Go)

		if !p.needsPointerCheck(f, param.Go, args[i]) || param.BadPointer || p.checkUnsafeStringData(args[i]) {
			if ptype != param.Go {
				needsUnsafe = true
			}
			fmt.Fprintf(&sb, "var _cgo%d %s = %s; ", i,
				gofmt(ptype), gofmtPos(arg, origArg.Pos()))
			continue
		}

		// Check for &a[i].