func mapaccess1_fat(mapType *byte, hmap map[any]any, key *any, zero *byte) (val *any)
func mapaccess2(mapType *byte, hmap map[any]any, key *any) (val *any, pres bool)
func mapaccess2_fast32(mapType *byte, hmap map[any]any, key uint32) (val *any, pres bool)
func mapaccess2_fast64(mapType *byte, hmap map[any]any, key uint64) (val *any, pres bool)

    Map<Object, Object> createEmptyMap(Class<?> mapType) {
        if (mapType.isAssignableFrom(LinkedHashMap.class)) {
            return new LinkedHashMap<Object, Object>();
        }
        if (mapType.isAssignableFrom(TreeMap.class)) {
            return new TreeMap<Object, Object>();
        }
        throw new UnsupportedOperationException(String.format("Cannot convert a Map to type %s.", mapType.getName()));
    }

type slice []int

type maptype map[int]int

func MakePrivateCollection() *Collection {
	return &Collection{
		root: unsafe.Pointer(&nodeLoc{}),
	}
}

func MakePrivateCollection2() *Collection {
	return &Collection{
		root: unsafe.Pointer(&slice{}),
	}
}
func MakePrivateCollection3() *Collection {
	return &Collection{
		root: unsafe.Pointer(&maptype{}),
	}

package main

import (
	"math/rand"
	"runtime"
	"sync"
)

func mapTypes() []MapType {
	// TODO(bradfitz): bunch more map types of all different key and value types.
	// Use reflect.MapOf and a program to generate lots of types & struct types.
	// For now, just one:
	return []MapType{intMapType{}}
}

type MapType interface {
	NewMap() Map
}

type Map interface {
	AddItem()
	DelItem()
	Len() int

	}
	return NewCompositedCompilerFromTemplate(compositionContext), nil
}

func NewCompositedCompilerFromTemplate(context *CompositionEnv) *CompositedCompiler {
	context = &CompositionEnv{
		MapType:           context.MapType,
		EnvSet:            context.EnvSet,
		CompiledVariables: map[string]CompilationResult{},
	}
	compiler := NewCompiler(context.EnvSet)
	filterCompiler := NewFilterCompiler(context.EnvSet)

            }
    }

    override val typeContext = KaFe10TypeSystemCommonBackendContextForTypeMapping(resolveSession)

    fun mapType(type: KotlinType, mode: TypeMappingMode = TypeMappingMode.DEFAULT, sw: JvmSignatureWriter? = null): Type {
        return AbstractTypeMapper.mapType(this, type, mode, sw)
    }

    fun isPrimitiveBacked(type: KotlinType): Boolean =
        AbstractTypeMapper.isPrimitiveBacked(this, type)

        SortedSet       | TreeSet
    }

    def "maps map types"() {
        expect:
        def map = mapper.createEmptyMap(sourceType)
        map.getClass() == mapType

        where:
        sourceType | mapType
        Map        | LinkedHashMap
        SortedMap  | TreeMap
    }

}

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 growWork_fast64(t *maptype, h *hmap, bucket uintptr) {
	// make sure we evacuate the oldbucket corresponding
	// to the bucket we're about to use
	evacuate_fast64(t, h, bucket&h.oldbucketmask())

	// evacuate one more oldbucket to make progress on growing
	if h.growing() {
		evacuate_fast64(t, h, h.nevacuate)
	}
}

func evacuate_fast64(t *maptype, h *hmap, oldbucket uintptr) {

	if t.Kind() != Struct {
		return nil
	}
	return (*StructType)(unsafe.Pointer(t))
}

// MapType returns t cast to a *MapType, or nil if its tag does not match.
func (t *Type) MapType() *MapType {
	if t.Kind() != Map {
		return nil
	}
	return (*MapType)(unsafe.Pointer(t))
}

// ArrayType returns t cast to a *ArrayType, or nil if its tag does not match.