renameing to match expressions

test/cases/hash_constant/hash.tst

@@ -0,0 +1,7 @@
+{ foo => 33 }
+-- -- --
+s(:expressions, 
+  s(:hash, 
+    s(:assoc, 
+      s(:name,  :foo), 
+      s(:int,  33))))

test/cases/hash_constant/hash2.tst

@@ -0,0 +1,7 @@
+{ foo => true }
+-- -- --
+s(:expressions, 
+  s(:hash, 
+    s(:assoc, 
+      s(:name,  :foo), 
+      s(:true))))

test/cases/hash_constant/hash_list.tst

@@ -0,0 +1,10 @@
+{foo => 33 , bar => 42}
+-- -- --
+s(:expressions, 
+  s(:hash, 
+    s(:assoc, 
+      s(:name,  :foo), 
+      s(:int,  33)), 
+    s(:assoc, 
+      s(:name,  :bar), 
+      s(:int,  42))))