syntax.icl 66.5 KB
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implementation module syntax

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import StdEnv, compare_constructor // ,RWSDebug
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import scanner, general, Heap, typeproperties, utilities, compilerSwitches
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::	Ident =
	{ 	id_name		:: !String
	,	id_info 	:: !SymbolPtr
	}

instance toString Ident
where toString {id_name} = id_name

instance toString (Import from_symbol)
where toString {import_module} = toString import_module


/*	Each Identifier is equipped with a pointer to a SymbolTableEntry that is
	used for binding the identifier with its definition.
*/

::	SymbolTable			:== Heap SymbolTableEntry
::	SymbolPtr 			:== Ptr SymbolTableEntry

::	SymbolTableEntry = 
	{	ste_kind		:: !STE_Kind
	,	ste_index		:: !Index
	,	ste_def_level	:: !Level
	,	ste_previous	:: SymbolTableEntry
	}

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::	STE_BoundTypeVariable	= { stv_count :: !Int, stv_attribute :: !TypeAttribute, stv_info_ptr :: !TypeVarInfoPtr }
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::	STE_Kind	= STE_FunctionOrMacro ![Index]
				| STE_Type
				| STE_Constructor
				| STE_Selector ![Global Index]
				| STE_Field !Ident
				| STE_Class
				| STE_Member
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				| STE_Generic			// AA: For generic declarations
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				| STE_Instance !Ident // the class (for explicit imports (1.3 syntax only))
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				| STE_Variable !VarInfoPtr
				| STE_TypeVariable !TypeVarInfoPtr
				| STE_TypeAttribute !AttrVarInfoPtr
				| STE_BoundTypeVariable !STE_BoundTypeVariable
				| STE_Imported !STE_Kind !Index
				| STE_DclFunction
				| STE_Module !(Module (CollectedDefinitions ClassInstance IndexRange))
				| STE_ClosedModule
				| STE_Empty 
				| STE_DictType !CheckedTypeDef
				| STE_DictCons !ConsDef
				| STE_DictField !SelectorDef
				| STE_Called ![Index] /* used during macro expansion to indicate that this function is called */
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				| STE_ExplImpSymbol !Int
				| STE_ExplImpComponentNrs ![ComponentNrAndIndex] ![Declaration]
				| STE_BelongingSymbol !Int
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				| STE_UsedType !Index !STE_Kind
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::	Declaration = Declaration !DeclarationRecord

::	DeclarationRecord =
	{	decl_ident	:: !Ident
	,	decl_pos	:: !Position
	,	decl_kind	:: !STE_Kind
	,	decl_index	:: !Index
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	}

::	ComponentNrAndIndex =
	{	cai_component_nr	:: !Int
	,	cai_index			:: !Int
	}
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::	Global object =
	{	glob_object	:: !object
	,	glob_module	:: !Index
	}
	
::	Module defs = 
	{	mod_name		:: !Ident
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	,	mod_modification_time	:: {#Char}
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	,	mod_type		:: !ModuleKind
	, 	mod_imports		:: ![ParsedImport]
	,	mod_imported_objects :: ![ImportedObject]
	,	mod_defs		:: !defs
	}

::	ParsedModule	:== Module  [ParsedDefinition]
::	ScannedModule 	:== Module  (CollectedDefinitions (ParsedInstance FunDef) IndexRange)

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::	ModuleKind	= MK_Main | MK_Module | MK_System | MK_None | MK_NoMainDcl
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::	RhsDefsOfType	= ConsList ![ParsedConstructor]
					| SelectorList !Ident ![ATypeVar] ![ParsedSelector]
					| TypeSpec !AType
					| EmptyRhs !BITVECT

::	CollectedDefinitions instance_kind macro_defs =
	{	def_types 			:: ![TypeDef TypeRhs]
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	,	def_constructors	:: ![ConsDef]
	,	def_selectors		:: ![SelectorDef]
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	,	def_macros			:: !macro_defs
	,	def_classes			:: ![ClassDef]
	,	def_members			:: ![MemberDef]
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	,	def_generics		:: ![GenericDef] // AA
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	,	def_funtypes		:: ![FunType]
	,	def_instances		:: ![instance_kind]
	}

::	LocalDefs = LocalParsedDefs [ParsedDefinition] | CollectedLocalDefs CollectedLocalDefs

::	IndexRange	= { ir_from :: !Index, ir_to :: !Index }

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::	ArrayAndListInstances = {
		ali_array_first_instance_indices :: ![Int],
		ali_list_first_instance_indices :: ![Int],
		ali_tail_strict_list_first_instance_indices :: ![Int],
		ali_instances_range :: !IndexRange
	}

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::  Index	:== Int
NoIndex		:== -1


::  Level	:== Int
NotALevel 	:==  -1

::	CollectedLocalDefs =
	{	loc_functions	:: !IndexRange
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	,	loc_nodes		:: ![NodeDef ParsedExpr]
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	}

::	NodeDef dst =
	{	nd_dst		::!dst,
		nd_alts		::!OptGuardedAlts,
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		nd_locals	::!LocalDefs,
		nd_position	::!Position		
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	}

::	Rhs =
	{	rhs_alts	:: !OptGuardedAlts
	,	rhs_locals	:: !LocalDefs
	}

cIsAFunction	:== True
cIsNotAFunction :== False

::	ParsedDefinition 
	=	PD_Function  Position Ident Bool [ParsedExpr] Rhs FunKind
	|	PD_NodeDef  Position ParsedExpr Rhs
	|	PD_Type ParsedTypeDef
	|	PD_TypeSpec Position Ident Priority (Optional SymbolType) Specials
	|	PD_Class ClassDef [ParsedDefinition]
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	|	PD_Generic GenericDef // AA
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	|	PD_Instance (ParsedInstance ParsedDefinition)
	|	PD_Instances [ParsedInstance ParsedDefinition]
	|	PD_Import [ParsedImport]
	|	PD_ImportedObjects [ImportedObject]
	|	PD_Erroneous

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::	FunKind	= FK_Function !Bool | FK_Macro | FK_Caf | FK_Unknown
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::	DefOrImpFunKind = FK_DefFunction !Bool| FK_ImpFunction !Bool | FK_DefMacro | FK_ImpMacro | FK_ImpCaf | FK_DefOrImpUnknown

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cNameNotLocationDependent :== False
cNameLocationDependent :== True
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::	ParsedSelector =
	{	ps_field_name		:: !Ident
	,	ps_selector_name	:: !Ident
	,	ps_field_type		:: !AType
	,	ps_field_var		:: !Ident
	,	ps_field_pos		:: !Position
	}

::	ParsedConstructor =
	{	pc_cons_name 	:: !Ident
	,	pc_cons_arity	:: !Int
	,	pc_exi_vars		:: ![ATypeVar]
	,	pc_arg_types	:: ![AType]
	,	pc_cons_prio	:: !Priority
	,	pc_cons_pos		:: !Position
	}
	
::	ParsedInstance member =
	{	pi_class 	:: !Ident
	,	pi_ident	:: !Ident
	,	pi_types	:: ![Type]
	,	pi_context	:: ![TypeContext]
	,	pi_pos		:: !Position
	,	pi_members	:: ![member]
	,	pi_specials	:: !Specials
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	,	pi_generate  :: !Bool // AA: instance is to be generated
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	}


::	Specials
	= SP_ParsedSubstitutions 	![Env Type TypeVar]
	| SP_Substitutions 		 	![SpecialSubstitution]
	| SP_ContextTypes			![Special]
	| SP_FunIndex				!Index
	| SP_TypeOffset				!Int
	| SP_None

::	SpecialSubstitution =
	{	ss_environ	:: !Env Type TypeVar
	,	ss_context	:: ![TypeContext]
	,	ss_vars		:: ![TypeVar]
	,	ss_attrs	:: ![AttributeVar]
	}

::	Special =
	{	spec_index	:: !Global Index
	,	spec_types	:: ![[Type]]
	,	spec_vars	:: ![TypeVar]
	, 	spec_attrs	:: ![AttributeVar]
	}


::	AttrInequality =
	{	ai_demanded :: !AttributeVar
	,	ai_offered	:: !AttributeVar
	}

::	DefinedSymbol = 
	{	ds_ident		:: !Ident
	,	ds_arity		:: !Int
	,	ds_index		:: !Index
	}

::	ClassSymbIdent =
	{	cs_name		:: !Ident
	,	cs_arity 	:: !Int
	,	cs_index 	:: !Int
	}

::	ClassDef =
 	{	class_name			:: !Ident
	,	class_arity			:: !Int
	,	class_args			:: ![TypeVar]
	,	class_context		:: ![TypeContext]
	,	class_members		:: !{# DefinedSymbol}
	,	class_dictionary	:: !DefinedSymbol
	,	class_pos			:: !Position
	,	class_cons_vars		:: !BITVECT
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	,	class_arg_kinds		:: ![TypeKind] // filled in in checkKindCorrectness phase
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	}

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::	ClassDefInfos :== {# .{! [TypeKind]}}

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::	MemberDef =
	{	me_symb			:: !Ident
	,	me_class		:: !Global Index
	,	me_offset		:: !Index
	,	me_type			:: !SymbolType
	,	me_type_ptr		:: !VarInfoPtr
	,	me_class_vars	:: ![TypeVar]
	,	me_pos			:: !Position
	,	me_priority 	:: !Priority
	}

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// AA.. 
::	GenericDef = 
	{	gen_name		:: !Ident	// the generics name in IC_Class 
	,	gen_member_name	:: !Ident	// the generics name in IC_Member
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	,	gen_type		:: !GenericType
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	, 	gen_pos			:: !Position
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	,	gen_kinds_ptr	:: !TypeVarInfoPtr		// hack: contains all used kinds 
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	,	gen_cons_ptr 	:: !TypeVarInfoPtr		// hack: cons instance function
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	, 	gen_classes		:: !GenericClassInfos 	// generated classes
	,	gen_isomap		:: !DefinedSymbol		// isomap function
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	}

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:: GenericType = 
	{	gt_type 		:: !SymbolType
	,	gt_vars			:: ![TypeVar]			// generic arguments
	,	gt_arity		:: !Int					// number of generic arguments	
	}

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:: GenericClassInfo = 
	{	gci_kind 	:: !TypeKind
	,	gci_class	:: !DefinedSymbol
	}
:: GenericClassInfos :== [GenericClassInfo] 	 

getGenericClassForKind 	:: !GenericDef !TypeKind -> (!Bool, DefinedSymbol)
getGenericClassForKind	{gen_classes} kind
	= get_class gen_classes kind
where
	get_class [] kind 
		= (False, undef)
	get_class [{gci_kind, gci_class}:gcis] kind
		| gci_kind == kind	= (True, gci_class)	 
		| otherwise			= get_class gcis kind
	
addGenericKind :: !GenericDef !TypeKind -> !GenericDef
addGenericKind generic_def=:{gen_name, gen_classes} kind 
	#(ok, _) = getGenericClassForKind generic_def kind
	| ok = generic_def
	# class_ds = 
		{	ds_ident = {id_name = gen_name.id_name +++ ":" +++ toString kind, id_info = nilPtr}
		, 	ds_index = NoIndex
		,	ds_arity = 1
		}
	= {generic_def & gen_classes = [{gci_kind = kind, gci_class = class_ds}:gen_classes]} 	

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// ..AA
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::	InstanceType =
	{	it_vars			:: [TypeVar]
	,	it_types		:: ![Type]
	,	it_attr_vars	:: [AttributeVar]
	,	it_context		:: ![TypeContext]
	}

::	ClassInstance =
 	{	ins_class		:: !Global DefinedSymbol
	,	ins_ident		:: !Ident
	,	ins_type		:: !InstanceType
	,	ins_members		:: !{# DefinedSymbol}
	,	ins_specials	:: !Specials
	,	ins_pos			:: !Position
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	,	ins_is_generic	:: !Bool			//AA 
	, 	ins_generate	:: !Bool			//AA
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	,	ins_partial		:: !Bool			//AA
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	,	ins_generic		:: !Global Index	//AA
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	}

::	Import from_symbol =
	{	import_module		:: !Ident
	,	import_symbols		:: ![from_symbol]
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	,	import_file_position:: !Position	// for error messages
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	}

::	ParsedImport		:== Import ImportDeclaration

::	ImportedIdent =
	{	ii_ident	:: !Ident
	,	ii_extended	:: !Bool
	}

::	ImportDeclaration	= ID_Function !ImportedIdent
						| ID_Class !ImportedIdent !(Optional [ImportedIdent])
						| ID_Type !ImportedIdent !(Optional [ImportedIdent])
						| ID_Record !ImportedIdent !(Optional [ImportedIdent])
						| ID_Instance !ImportedIdent !Ident !(![Type],![TypeContext])
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						| ID_OldSyntax ![Ident]
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cIsImportedLibrary :== True
cIsImportedObject :== False
:: ImportedObject =
	{	io_is_library :: !Bool
	,	io_name    :: !{#Char}
	}

::	RecordType =
	{	rt_constructor	:: !DefinedSymbol
	,	rt_fields		:: !{# FieldSymbol}
	}
	
::	FieldSymbol =
	{	fs_name			:: !Ident
	,	fs_var			:: !Ident
	,	fs_index		:: !Index
	}


::	TypeRhs	= AlgType ![DefinedSymbol]
			| SynType !AType
			| RecordType !RecordType
			| AbstractType !BITVECT
			| UnknownType

::	ParsedTypeDef :== TypeDef RhsDefsOfType
::	CheckedTypeDef :== TypeDef TypeRhs

cAllBitsClear			:== 0
cIsHyperStrict			:== 1
cIsNonCoercible			:== 2
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cIsAnalysed				:== 4
cIsAbstractType			:== 8

::	GlobalIndex =
	{	gi_module	::!Int
	,	gi_index	::!Int
	}
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instance == GlobalIndex
where
	(==) gi1 gi2 = gi1.gi_module == gi2.gi_module && gi1.gi_index == gi2.gi_index
	
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::	TypeDef type_rhs =
 	{	td_name			:: !Ident
	,	td_index		:: !Int
	,	td_arity		:: !Int
	,	td_args			:: ![ATypeVar]
	,	td_attrs		:: ![AttributeVar]
	,	td_context		:: ![TypeContext]
	,	td_rhs			:: !type_rhs
	,	td_attribute	:: !TypeAttribute
	,	td_pos			:: !Position
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	,	td_used_types	:: ![GlobalIndex]
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	}

::	FunType =
	{	ft_symb			:: !Ident
	,	ft_arity		:: !Int
	,	ft_priority		:: !Priority
	,	ft_type			:: !SymbolType
	,	ft_pos			:: !Position
	,	ft_specials		:: !Specials
	,	ft_type_ptr		:: !VarInfoPtr
	}

::	FreeVar =
	{	fv_def_level	:: !Level
	,	fv_name			:: !Ident
	,	fv_info_ptr		:: !VarInfoPtr
	,	fv_count		:: !Int
	}
	
::	FunCall =
	{	fc_level		:: !Level
	,	fc_index		:: !Index
	}

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/* Sjaak 19-3-2001 ... */

FI_IsMacroFun	:== 1			// whether the function is a local function of a macro
FI_HasTypeSpec	:== 2			// whether the function has u user defined type

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::	FunInfo =
	{	fi_calls			:: ![FunCall]
	,	fi_group_index		:: !Index
	,	fi_def_level		:: !Level
	,	fi_free_vars		:: ![FreeVar]
	,	fi_local_vars		:: ![FreeVar]
	,	fi_dynamics			:: ![ExprInfoPtr]
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	,	fi_properties		:: !BITVECT
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	}
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/* ... Sjaak 19-3-2001 */
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::	ParsedBody =
	{	pb_args	:: ![ParsedExpr]
	,	pb_rhs	:: !Rhs
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	,	pb_position	:: !Position
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	}

::	CheckedBody =
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	{	cb_args		:: ![FreeVar]
	,	cb_rhs		:: ![CheckedAlternative]
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	}

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::	CheckedAlternative =
	{	ca_rhs		:: !Expression
	,	ca_position	:: !Position	// the position is NoPos iff the position information for this
	}								// alternative is already stored in a case alternative
									// (in ap_position, bp_position or dp_position)

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::	TransformedBody =
	{	tb_args			:: ![FreeVar]
	,	tb_rhs			:: !Expression
	}

::	FunctionBody	= ParsedBody ![ParsedBody]
					| CheckedBody !CheckedBody
	/* The next three constructors are used during macro expansion (module transform) */
					| PartioningMacro
					| PartioningFunction !CheckedBody !Int
					| RhsMacroBody !CheckedBody
	/* macro expansion the transforms a CheckedBody into a TransformedBody */
					| TransformedBody !TransformedBody
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					| Expanding ![FreeVar] // the parameters of the newly generated function
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					| BackendBody ![BackendBody]
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					| NoBody
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::	BackendBody =
	{	bb_args	:: ![FunctionPattern]
	,	bb_rhs	:: !Expression
	}

::	FunDef =
	{	fun_symb		:: !Ident
	,	fun_arity		:: !Int
	,	fun_priority	:: !Priority
	,	fun_body		:: !FunctionBody
	,	fun_type		:: !Optional SymbolType
	,	fun_pos			:: !Position
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	,	fun_kind		:: !DefOrImpFunKind
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	,	fun_lifted		:: !Int
//	,	fun_type_ptr	:: !TypeVarInfoPtr
	,	fun_info		:: !FunInfo
	}

cIsAGlobalVar	:== True
cIsALocalVar	:== False

::	ConsClasses =
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	{	cc_size			::!Int
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	,	cc_args			::![ConsClass]
	,	cc_linear_bits	::![Bool]
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	,	cc_producer		::!ProdClass
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	}
					
::	ConsClass	:== Int

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::	ProdClass	:== Bool

pIsSafe			:== True

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::	OptionalVariable :== Optional (Bind Ident VarInfoPtr)

:: 	AuxiliaryPattern
		= AP_Algebraic !(Global DefinedSymbol) !Index [AuxiliaryPattern] OptionalVariable
		| AP_Variable !Ident !VarInfoPtr OptionalVariable
		| AP_Basic !BasicValue OptionalVariable
		| AP_Dynamic !AuxiliaryPattern !DynamicType !OptionalVariable
		| AP_Constant !AP_Kind !(Global DefinedSymbol) !Priority
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		| AP_WildCard !OptionalVariable
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		| AP_Empty !Ident

:: AP_Kind = APK_Constructor !Index | APK_Macro

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::	VarInfo  =	VI_Empty | VI_Type !AType !(Optional CoercionPosition) | VI_FAType ![ATypeVar] !AType !(Optional CoercionPosition) |
				VI_Occurrence !Occurrence | VI_UsedVar !Ident |
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				VI_Expression !Expression | VI_Variable !Ident !VarInfoPtr | VI_LiftedVariable !VarInfoPtr |
				VI_Count !Int /* the reference count of a variable */ !Bool /* true if the variable is global, false otherwise */ |
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				VI_AccVar !ConsClass !ArgumentPosition /* used during fusion to determine accumulating parameters of functions */ |
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				VI_Alias !BoundVar /* used for resolving aliases just before type checking (in transform) */ |
				 /* used during elimination and lifting of cases */
				VI_FreeVar !Ident !VarInfoPtr !Int !AType | VI_BoundVar !AType | VI_LocalVar |
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				VI_ClassVar !Ident !VarInfoPtr !Int | /* to hold dictionary variables during overloading */
				VI_ForwardClassVar !VarInfoPtr | /* to hold the dictionary variable generated during overloading */
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				VI_Forward !BoundVar | VI_LetVar !LetVarInfo | VI_LetExpression !LetExpressionInfo | VI_CaseVar !VarInfoPtr |
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				VI_CorrespondenceNumber !Int | /* it is assumed that this alternative is _only_ used in module comparedefimp */
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				VI_SequenceNumber !Int | VI_AliasSequenceNumber !BoundVar |
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				VI_Used | /* for indicating that an imported function has been used */
				VI_PropagationType !SymbolType | /* for storing the type with propagation environment of an imported function */
				VI_ExpandedType !SymbolType | /* for storing the (expanded) type of an imported function */
				VI_Record ![AuxiliaryPattern] |
				VI_Pattern !AuxiliaryPattern |
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				VI_Default !Int | VI_Indirection !Int | /* used during conversion of dynamics; the Int indiacted the refenrence count */
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				VI_Body !SymbIdent !TransformedBody ![FreeVar] | /* used during fusion */
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				VI_Dictionary !SymbIdent ![Expression] !Type | /* used during fusion */
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				VI_Extended !ExtendedVarInfo !VarInfo |
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				VI_Defined /* for marking type code variables during overloading */ | VI_LocallyDefined |
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// MdM
				VI_CPSLocalExprVar !Int /* MdM - the index of the variable as generated by the theorem prover */
// ... MdM
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				| VI_Labelled_Empty {#Char} // RWS debugging
				| VI_LocalLetVar // RWS, mark Let vars during case transformation
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::	ExtendedVarInfo = EVI_VarType !AType
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::	ArgumentPosition :== Int

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::	VarInfoPtr	:== Ptr VarInfo

::	LetVarInfo =
	{	lvi_count		:: !Int
	,	lvi_depth		:: !Int
	,	lvi_new			:: !Bool
	,	lvi_var			:: !Ident
	,	lvi_expression	:: !Expression	
	,   lvi_previous	:: ![PreviousLetVarInfo]
	}

::	PreviousLetVarInfo =
	{	plvi_count		:: !Int
	,	plvi_depth		:: !Int
	,	plvi_new		:: !Bool
	}

::	LetExpressionStatus	= LES_Untouched | LES_Moved | LES_Updated !Expression

::	LetExpressionInfo =
	{	lei_count			:: !Int
	,	lei_depth			:: !Int 
	,	lei_var				:: !FreeVar 
	,   lei_expression		:: !Expression
	,   lei_status			:: !LetExpressionStatus
	,   lei_type			:: !AType
	}

cNotVarNumber :== -1

::	BoundVar = 
	{	var_name		:: !Ident
	,	var_info_ptr	:: !VarInfoPtr
	,	var_expr_ptr	:: !ExprInfoPtr
	}

::	TypeSymbIdent =
	{	type_name		:: !Ident
	,	type_arity		:: !Int
	,	type_index		:: !Global Index
	,	type_prop		:: !TypeSymbProperties
	}

::	TypeSymbProperties =
	{	tsp_sign		:: !SignClassification
	,	tsp_propagation	:: !PropClassification
	,	tsp_coercible	:: !Bool
	}

::	SymbKind	= SK_Unknown
				| SK_Function !(Global Index)
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				| SK_LocalMacroFunction !Index
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				| SK_OverloadedFunction !(Global Index)
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				| SK_Generic !(Global Index) !TypeKind		// AA
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				| SK_Constructor !(Global Index)
				| SK_Macro !(Global Index)
//				| SK_RecordSelector !(Global Index)
				| SK_GeneratedFunction !FunctionInfoPtr !Index
				| SK_TypeCode

// MW2 moved some type definitions

/*	Some auxiliary type definitions used during fusion. Actually, these definitions
	should have beengiven in seperate module. Unfortunately, Clean's module system
	forbids cyclic dependencies between def modules.
	
*/

::	FunctionHeap 	:== Heap FunctionInfo

::	FunctionInfoPtr	:== Ptr FunctionInfo

::	FunctionInfo	= FI_Empty | FI_Function !GeneratedFunction

::	Producer	= PR_Empty
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				| PR_Function !SymbIdent !Index
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				| PR_Class !App ![(BoundVar, Type)] !Type
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				| PR_Constructor !SymbIdent ![Expression]
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				| PR_GeneratedFunction !SymbIdent !Index
				| PR_Curried !SymbIdent
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::	InstanceInfo = II_Empty | II_Node !{! Producer} !FunctionInfoPtr !InstanceInfo !InstanceInfo

::	GeneratedFunction = 
	{	gf_fun_def			:: !FunDef
	,	gf_instance_info	:: !InstanceInfo
	,	gf_cons_args		:: !ConsClasses
	,	gf_fun_index		:: !Index
	}
	
/*	... main type definitions continued .... */

::	ExpressionHeap 	:== Heap ExprInfo

::	ExprInfoPtr		:== Ptr ExprInfo

::	TempLocalVar	:== Int

::	DynamicPtr		:== ExprInfoPtr

::	ExprInfo		= EI_Empty

		/* For handling overloading */

					| EI_Overloaded !OverloadedCall 						/* initial, set by the type checker */
					| EI_Instance 	!(Global DefinedSymbol) ![Expression]	/* intermedediate, used during resolving of overloading */ 
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					| EI_Selection 	![Selection] !VarInfoPtr ![Expression]	/* intermedediate, used during resolving of overloading */
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					| EI_Context 	![Expression]							/* intermedediate, used during resolving of overloading */

		/* For handling dynamics */

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					| EI_Dynamic 				!(Optional DynamicType) !Int
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					| EI_DynamicType			!DynamicType ![DynamicPtr]

		/* Auxiliary, was EI_DynamicType before checking */

					| EI_DynamicTypeWithVars	![TypeVar] !DynamicType ![DynamicPtr]				

		/* Auxiliary, used during type checking */

					| EI_TempDynamicType 		!(Optional DynamicType) !AType ![TypeContext] !ExprInfoPtr !SymbIdent
					| EI_TempDynamicPattern 	![TypeVar] !DynamicType ![DynamicPtr] ![TempLocalVar] !AType ![TypeContext] !ExprInfoPtr !SymbIdent
					
					| EI_TypeOfDynamic 			![VarInfoPtr] !TypeCodeExpression				/* Final */
					| EI_TypeOfDynamicPattern 	![VarInfoPtr] !TypeCodeExpression				/* Final */

					| EI_TypeCode 		!TypeCodeExpression
					| EI_TypeCodes 		![TypeCodeExpression]

					| EI_Attribute !Int


		/*	EI_FreeVariables is uded to store the (free) variables occurring in the case expression */

//					| EI_FreeVariables ![UnboundVariable] !ExprInfo

		/* EI_ClassTypes is used to store the instance types of a class These type are used during fusion to generate proper types for 
		   the fusion result (i.e. the resulting function after elimination of dictionaries) */

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					| EI_DictionaryType !Type
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					| EI_CaseType !CaseType
					| EI_LetType ![AType]
					| EI_CaseTypeAndRefCounts !CaseType !RefCountsInCase
					| EI_LetTypeAndRefCounts ![AType] ![Int]

		/* for converting case into function patterns the following auxiliary constuctors are used */

					| EI_Default !Expression !AType !ExprInfoPtr
					| EI_DefaultFunction !SymbIdent ![Expression]
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					| EI_Extended !ExtendedExprInfo !ExprInfo
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::	ExtendedExprInfo
					= EEI_ActiveCase !ActiveCaseInfo

::	ActiveCaseInfo =
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	{	aci_params					:: ![FreeVar]
	,	aci_opt_unfolder			:: !(Optional SymbIdent)
	,	aci_free_vars				:: !Optional [BoundVar]
	,	aci_linearity_of_patterns	:: ![[Bool]]
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	}
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::	RefCountsInCase = 
	{	rcc_all_variables		:: ![CountedVariable]
	,	rcc_default_variables	:: ![CountedVariable]
	,	rcc_pattern_variables	:: ![[CountedVariable]]
	}

::	CountedVariable =
	{	cv_variable	:: !VarInfoPtr
	,	cv_count	:: !Int
	}


/*
	OverloadedCall contains (type) information about functions that are overloaded. This structure is built during type checking
	and used after (standard) unification to insert the proper instances of the corresponding functions.

*/

::	OverloadedCall = 
	{	oc_symbol	:: !SymbIdent
	,	oc_context	:: ![TypeContext]
	,	oc_specials	:: ![Special]
	}

/*
	CaseType contains the type information needed to type the corresponding case construct:
		ct_pattern_type : the type of the pattern
		ct_result_type  : the type of the result (of each pattern)
		ct_cons_types   : the types of the arguments of each pattern constructor
*/
		
::	CaseType =
	{	ct_pattern_type	:: !AType
	,	ct_result_type	:: !AType
	,	ct_cons_types 	:: ![[AType]]
	}
		

::	SymbIdent =
	{	symb_name		:: !Ident
	,	symb_kind		:: !SymbKind
	,	symb_arity		:: !Int
	}

::	ConsDef =
	{	cons_symb			:: !Ident
	,	cons_type			:: !SymbolType
	,	cons_arg_vars		:: ![[ATypeVar]]
	,	cons_priority		:: !Priority
	,	cons_index			:: !Index
	,	cons_type_index		:: !Index
	,	cons_exi_vars		:: ![ATypeVar]
//	,	cons_exi_attrs		:: ![AttributeVar]
	,	cons_type_ptr		:: !VarInfoPtr
	,	cons_pos			:: !Position
	}

::	SelectorDef =
	{	sd_symb			:: !Ident
	,	sd_field		:: !Ident
	,	sd_type			:: !SymbolType
	,	sd_exi_vars		:: ![ATypeVar]
//	,	sd_exi_attrs	:: ![AttributeVar]
	,	sd_field_nr		:: !Int
	,	sd_type_index	:: !Int
	,	sd_type_ptr		:: !VarInfoPtr
	,	sd_pos			:: !Position
	}

::	SymbolType =
	{	st_vars			:: ![TypeVar]
	,	st_args			:: ![AType]
	,	st_arity		:: !Int
	,	st_result		:: !AType
	,	st_context		:: ![TypeContext]
	,	st_attr_vars	:: ![AttributeVar]
	,	st_attr_env		:: ![AttrInequality]
	}

::	TypeContext =
	{	tc_class	:: !Global DefinedSymbol
	,	tc_types	:: ![Type]
	,	tc_var		:: !VarInfoPtr
	}

::	AType =
	{	at_attribute	:: !TypeAttribute
	,	at_annotation	:: !Annotation
	,	at_type			:: !Type
	}
	
::	TempAttrId		:== Int
::	TempVarId		:== Int

::	Type	=	TA !TypeSymbIdent ![AType]
			|	(-->) infixr 9 !AType !AType
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			| 	TArrow							/* (->) */
			| 	TArrow1	!AType					/* ((->) a) */
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			|	(:@:) infixl 9 !ConsVariable ![AType]
			|	TB !BasicType

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			|	TFA [ATypeVar] Type
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			| 	GTV !TypeVar
			| 	TV !TypeVar
			|	TempV !TempVarId				/* Auxiliary, used during type checking */

			
			|	TQV	TypeVar
			|	TempQV !TempVarId				/* Auxiliary, used during type checking */

			|	TLifted !TypeVar				/* Auxiliary, used during type checking of lifted arguments */
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			|	TE

::	ConsVariable = CV 		!TypeVar
				 | TempCV 	!TempVarId
				 | TempQCV 	!TempVarId


::	DynamicType =
	{	dt_uni_vars 	:: ![ATypeVar]
	,	dt_global_vars	:: ![TypeVar]
	,	dt_type			:: !AType
	}

::	KindHeap	:== Heap KindInfo
::	KindInfoPtr	:== Ptr KindInfo

::	KindInfo	= KI_Var !KindInfoPtr
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				| KI_Arrow !KindInfo !KindInfo
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				| KI_Const
				
				| KI_ConsVar
				
				| KI_VarBind !KindInfoPtr
				| KI_NormVar !Int


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::	TypeVarInfo  	= TVI_Empty
					| TVI_Type !Type
					| TVI_TypeVar !TypeVarInfoPtr // Sjaak: to collect universally quantified type variables
					| TVI_Forward !TempVarId | TVI_TypeKind !KindInfoPtr
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					| TVI_SignClass !Index !SignClassification !TypeVarInfo | TVI_PropClass !Index !PropClassification !TypeVarInfo
					| TVI_Attribute TypeAttribute
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					| TVI_CorrespondenceNumber !Int /* auxiliary used in module comparedefimp */
					| TVI_AType !AType /* auxiliary used in module comparedefimp */
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					| TVI_Used /* to administer that this variable is encountered (in checkOpenTypes) */
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					| TVI_TypeCode !TypeCodeExpression
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					| TVI_CPSLocalTypeVar !Int /* MdM - the index of the variable as generated by the theorem prover */
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					| TVI_Kinds ![TypeKind] // AA: used to collect kinds during checking 
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					| TVI_Kind !TypeKind
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					| TVI_ConsInstance !DefinedSymbol //AA: generic cons instance function 
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					| TVI_Normalized !Int /* MV - position of type variable in its definition */
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::	TypeVarInfoPtr	:== Ptr TypeVarInfo
::	TypeVarHeap 	:== Heap TypeVarInfo

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::	AttrVarInfo  	= AVI_Empty
					| AVI_Attr !TypeAttribute
					| AVI_AttrVar !AttrVarInfoPtr // Sjaak: to collect universally quantified attribute variables
					| AVI_Forward !TempAttrId 
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					| AVI_CorrespondenceNumber !Int /* auxiliary used in module comparedefimp */
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					| AVI_Used
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					| AVI_Count !Int /* auxiliary used in module typesupport */
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					| AVI_SequenceNumber !Int // RWS
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::	AttrVarInfoPtr	:== Ptr AttrVarInfo
::	AttrVarHeap 	:== Heap AttrVarInfo

::	TypeHeaps =
	{	th_vars		:: ! .TypeVarHeap
	,	th_attrs	:: ! .AttrVarHeap
	}

::	TypeVar =
	{	tv_name				:: !Ident
	,	tv_info_ptr			:: !TypeVarInfoPtr
	}


::	ATypeVar =
	{	atv_attribute		:: !TypeAttribute
	,	atv_annotation		:: !Annotation
	,	atv_variable		:: !TypeVar
	}

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::	TypeAttribute = TA_Unique | TA_Multi | TA_Var !AttributeVar | TA_RootVar AttributeVar | TA_TempVar !Int // | TA_TempExVar !Int
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					| TA_Anonymous | TA_None
					| TA_List !Int !TypeAttribute | TA_Locked !TypeAttribute
					| TA_MultiOfPropagatingConsVar
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					| TA_PA_BUG
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::	AttributeVar =
	{	av_name			:: !Ident
	,	av_info_ptr		:: !AttrVarInfoPtr
	}

::	Annotation	=  AN_Strict | AN_None 

::	BasicType	= BT_Int | BT_Char | BT_Real | BT_Bool | BT_Dynamic
				| BT_File | BT_World
				| BT_String !Type /* the internal string type synonym only used to type string denotations */


::	BasicValue	= BVI !String | BVC !String | BVB !Bool | BVR !String | BVS !String


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::	TypeKind = KindVar !KindInfoPtr | KindConst | KindArrow ![TypeKind] | KindCycle
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::	PatternVar =
	{	pv_var		:: !FreeVar
	,	pv_arg_nr	:: !Int
	}

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::	Occurrence =
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	{	occ_ref_count		:: !ReferenceCount
	,	occ_bind			:: !OccurrenceBinding
	,	occ_pattern_vars	:: ![[PatternVar]]
	,	occ_observing		:: !Bool
	,	occ_previous 		:: ![ReferenceCount]
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	}

::	ReferenceCount = RC_Used !RC_Used | RC_Unused 

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::	SelectiveUse =
	{	su_field	:: !Int
	,	su_multiply :: ![ExprInfoPtr]
	,	su_uniquely :: ![ExprInfoPtr]
	}

::	RC_Used =
	{ 	rcu_multiply	:: ![ExprInfoPtr]
	,	rcu_selectively :: ![SelectiveUse]
	,	rcu_uniquely	:: ![ExprInfoPtr]
	}
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::	CountedFreeVar =
	{	cfv_var		:: !FreeVar
	,	cfv_count	:: !ReferenceCount
	}
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::	OccurrenceBinding	= OB_Empty 
						| OB_OpenLet	(Choice Expression [CountedFreeVar])
						| OB_LockedLet	(Choice Expression [CountedFreeVar])
//						| OB_OpenLet !Expression | OB_LockedLet !Expression
//						| OB_Pattern ![PatternVar] !OccurrenceBinding
//						| OB_Closed !LetOccurrences | OB_Marked !LetOccurrences
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::	TypeDefInfo =
	{	tdi_kinds			:: ![TypeKind]
	,	tdi_properties		:: !BITVECT
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	,	tdi_group			:: ![GlobalIndex]
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	,	tdi_group_nr		:: !Int
	,	tdi_group_vars		:: ![Int]
	,	tdi_cons_vars		:: ![Int]
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	,	tdi_index_in_group	:: !Index
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	,	tdi_classification	:: !TypeClassification
	}

::	TypeDefInfos :== {# .{# TypeDefInfo}}

::	OptGuardedAlts	= GuardedAlts ![GuardedExpr] !(Optional ExprWithLocalDefs)
				 	| UnGuardedExpr !ExprWithLocalDefs

::	GuardedExpr =
	{	alt_nodes	:: ![NodeDefWithLocals]
	,	alt_guard	:: !ParsedExpr
	,	alt_expr	:: !OptGuardedAlts
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	,	alt_ident	:: !Ident
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	,	alt_position:: !Position
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	}

::	ExprWithLocalDefs = 
	{	ewl_nodes	:: ![NodeDefWithLocals]
	,	ewl_expr	:: !ParsedExpr
	,	ewl_locals	:: !LocalDefs
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	,	ewl_position:: !Position
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	}

::	NodeDefWithLocals =
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