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+function txt=%while_string(W)
+//overloading function for "while" type tlist string function
+//this is a node of the AST
+//fields:
+// expression : "expression" type tlist (the loop expression)
+// statements : list of "equal" type tlist and list('EOL') (the
+// while instructions list)
+ txt=['While'
+ ' WhileExpression:'
+ ' '+string(W.expression)
+ ' WhileStatements:'
+ ' '+objectlist2string(W.statements)
+ 'EndWhile']
+endfunction