replaced VI_Alias with VI_AliasSequenceNumber to avoid potential clashes

with VI_Aliases from previous phases

backend/backendconvert.icl

@@ -1878,7 +1878,7 @@ getVariableSequenceNumber varInfoPtr be
 	= case vi of
 		VI_SequenceNumber sequenceNumber
 			-> (sequenceNumber,be)
-		VI_Alias {var_info_ptr}
+		VI_AliasSequenceNumber {var_info_ptr}
 			-> getVariableSequenceNumber var_info_ptr be
 		vi
 			-> abort "getVariableSequenceNumber" <<- vi

backend/backendpreprocess.icl

@@ -159,8 +159,8 @@ instance sequence LetBind where
 						# (vi, ss_varHeap) = readPtr var_info_ptr sequenceState.ss_varHeap
 						  non_alias_bound_var = case vi of
 													VI_SequenceNumber _		-> bound_var
-													VI_Alias alias_bound_var-> alias_bound_var
-						  ss_varHeap = writePtr lb_dst.fv_info_ptr (VI_Alias non_alias_bound_var) ss_varHeap
+													VI_AliasSequenceNumber alias_bound_var-> alias_bound_var
+						  ss_varHeap = writePtr lb_dst.fv_info_ptr (VI_AliasSequenceNumber non_alias_bound_var) ss_varHeap
 						-> { sequenceState & ss_varHeap = ss_varHeap }
 					_
 						-> sequence lb_dst sequenceState

frontend/syntax.dcl

@@ -524,7 +524,7 @@ cIsALocalVar	:== False
 				VI_ForwardClassVar !VarInfoPtr | /* to hold the dictionary variable generated during overloading */
 				VI_Forward !BoundVar | VI_LetVar !LetVarInfo | VI_LetExpression !LetExpressionInfo | VI_CaseVar !VarInfoPtr |
 				VI_CorrespondenceNumber !Int | /* it is assumed that this alternative is _only_ used in module comparedefimp */
-				VI_SequenceNumber !Int |
+				VI_SequenceNumber !Int | VI_AliasSequenceNumber !BoundVar |
 				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 */

frontend/syntax.icl

@@ -509,7 +509,7 @@ cIsALocalVar	:== False
 				VI_ForwardClassVar !VarInfoPtr | /* to hold the dictionary variable generated during overloading */
 				VI_Forward !BoundVar | VI_LetVar !LetVarInfo | VI_LetExpression !LetExpressionInfo | VI_CaseVar !VarInfoPtr |
 				VI_CorrespondenceNumber !Int | /* it is assumed that this alternative is _only_ used in module comparedefimp */
-				VI_SequenceNumber !Int |
+				VI_SequenceNumber !Int | VI_AliasSequenceNumber !BoundVar |
 				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 */