renameing to match expressions

test/cases/while_statement/big_while.tst

@@ -0,0 +1,35 @@
+while( n > 1)
+  tmp = a
+  a = b
+  b = tmp + b
+  puts(b)
+  n = n - 1
+end
+-- -- --
+s(:expressions, 
+  s(:while, 
+    s(:condition, 
+      s(:operator,  ">", 
+        s(:name,  :n), 
+        s(:int,  1))), 
+    s(:expressions, 
+      s(:assign, 
+        s(:name,  :tmp), 
+        s(:name,  :a)), 
+      s(:assign, 
+        s(:name,  :a), 
+        s(:name,  :b)), 
+      s(:assign, 
+        s(:name,  :b), 
+        s(:operator,  "+", 
+          s(:name,  :tmp), 
+          s(:name,  :b))), 
+      s(:call, 
+        s(:name,  :puts), 
+        s(:arguments, 
+          s(:name,  :b))), 
+      s(:assign, 
+        s(:name,  :n), 
+        s(:operator,  "-", 
+          s(:name,  :n), 
+          s(:int,  1))))))

test/cases/while_statement/while.tst

@@ -0,0 +1,17 @@
+while(1)
+  tmp = a
+  puts(b)
+end
+-- -- --
+s(:expressions, 
+  s(:while, 
+    s(:condition, 
+      s(:int,  1)), 
+    s(:expressions, 
+      s(:assign, 
+        s(:name,  :tmp), 
+        s(:name,  :a)), 
+      s(:call, 
+        s(:name,  :puts), 
+        s(:arguments, 
+          s(:name,  :b))))))

test/cases/while_statement/while_method.tst

@@ -0,0 +1,23 @@
+while(1)
+  tmp = String.new()
+  tmp.puts(i)
+end
+-- -- --
+s(:expressions, 
+  s(:while, 
+    s(:condition, 
+      s(:int,  1)), 
+    s(:expressions, 
+      s(:assign, 
+        s(:name,  :tmp), 
+        s(:call, 
+          s(:name,  :new), 
+          s(:arguments), 
+          s(:receiver, 
+            s(:module,  "String")))), 
+      s(:call, 
+        s(:name,  :puts), 
+        s(:arguments, 
+          s(:name,  :i)), 
+        s(:receiver, 
+          s(:name,  :tmp))))))