adding in yielding

hy/compiler.py

@@ -204,6 +204,18 @@ class HyASTCompiler(object):
                 kw_defaults=[]),
             body=self.compile(body))
 
+    @builds("pass")
+    def compile_pass_expression(self, expr):
+        return ast.Pass(lineno=expr.start_line, col_offset=expr.start_column)
+
+    @builds("yield")
+    def compile_yield_expression(self, expr):
+        expr.pop(0)
+        return ast.Yield(
+            value=self.compile(expr.pop(0)),
+            lineno=expr.start_line,
+            col_offset=expr.start_column)
+
     @builds("import")
     def compile_import_expression(self, expr):
         expr.pop(0)  # index

tests/native_tests/language.hy

@@ -151,3 +151,17 @@
   (def vals {"one" "two"})
   (assoc vals "two" "three")
   (assert (= (get vals "two") "three")))
+
+
+(defn test-pass []
+  "NATIVE: Test pass worksish"
+  (if true (pass) (pass))
+  (assert (= 1 1)))
+
+
+(defn test-yield []
+  "NATIVE: test yielding"
+  (defn gen [] (for [x [1 2 3 4]] (yield x)))
+  (def ret 0)
+  (for [y (gen)] (def ret (+ ret y)))
+  (assert (= ret 10)))