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
    }

//
//     type ChanType struct {
//         Tag  itag   // chanType
//         Dir  uint64 // 1 RecvOnly; 2 SendOnly; 3 SendRecv
//         Elem typeOff
//     }
//
//     type MapType struct {
//         Tag  itag // mapType
//         Key  typeOff
//         Elem typeOff
//     }
//
//     type FuncType struct {
//         Tag       itag // signatureType
//         PkgPath   stringOff

    override val token: KaLifetimeToken,
) : KaJvmTypeMapper(), KaFirSessionComponent {

    override fun mapTypeToJvmType(type: KaType, mode: TypeMappingMode): Type {
        return analysisSession.useSiteSession.jvmTypeMapper.mapType(type.coneType, mode, sw = null, unresolvedQualifierRemapper = null)
    }

    override fun isPrimitiveBacked(type: KaType): Boolean {
        return analysisSession.useSiteSession.jvmTypeMapper.isPrimitiveBacked(type.coneType)

    override fun mapTypeToJvmType(type: KaType, mode: TypeMappingMode): Type {
        val kotlinType = (type as KaFe10Type).fe10Type
        return typeMapper.mapType(kotlinType, mode)
    }

    override fun isPrimitiveBacked(type: KaType): Boolean {
        val kotlinType = (type as KaFe10Type).fe10Type
        return typeMapper.isPrimitiveBacked(kotlinType)
    }

			}
			return n.Pos()
		// types
		// case *ArrayType:
		// case *SliceType:
		// case *DotsType:
		// case *StructType:
		// case *Field:
		// case *InterfaceType:
		// case *FuncType:
		// case *MapType:
		// case *ChanType:

		// statements
		// case *EmptyStmt:
		// case *LabeledStmt:
		// case *BlockStmt:
		// case *ExprStmt:
		case *SendStmt:
			m = n.Chan
		// case *DeclStmt:
		case *AssignStmt: