Add yield issues when outside function.

parso/python/normalizer.py

@@ -125,9 +125,9 @@ class ErrorFinder(Normalizer):
                     in_loop = True
             if not in_loop:
                 self._add_syntax_error("'break' outside loop", leaf)
-        elif leaf.value == 'return':
+        elif leaf.value in ('yield', 'return'):
             if self._context.node.type != 'funcdef':
-                self._add_syntax_error("'return' outside function", leaf)
+                self._add_syntax_error("'%s' outside function" % leaf.value, leaf)
         elif leaf.value == 'await':
             if self._context.node.type != 'funcdef' \
                     or self._context.node.parent.type != 'async_funcdef':

test/test_python_errors.py

@@ -71,6 +71,7 @@ def test_indentation_errors(code, positions):
         'continue',
         'break',
         'return',
+        'yield',
         'try: pass\nexcept: pass\nexcept X: pass',
 
         # IndentationError
@@ -95,6 +96,7 @@ def test_python_exception_matches(code):
     ('code', 'version'), [
         # SyntaxError
         ('async def bla():\n def x():  await bla()', '3.5'),
+        ('yield from', '3.5'),
 
     ]
 )