Tests: fix race condition in output

These tests (`testForIterable`, `testYieldNested`) consistently fail on my
machine. I suspect this is because some output is printed stdout and some to
stderr. Since the streams are not synchronized this is inherently racy.

Author: robsdedude

mypyc/test-data/run-generators.test

@@ -257,7 +257,7 @@ def generator() -> Generator[int, None, Union[int, None]]:
         yield 2
         yield 3
     except Exception as e:
-        print_tb(wrapsys.exc_info()[2])
+        print_tb(wrapsys.exc_info()[2], file=wrapsys.stdout)
         s = str(e)
         if s:
             print('caught exception with value ' + s)
@@ -294,6 +294,7 @@ from typing import Any
 import sys
 def exc_info() -> Any:
     return sys.exc_info()  # type: ignore
+stdout: Any = sys.stdout  # type: ignore
 
 [file driver.py]
 import sys
@@ -348,24 +349,24 @@ with ctx_manager() as c:
 [out]
   File "native.py", line 10, in generator
     yield 3
+caught exception without value
   File "native.py", line 9, in generator
     yield 2
+caught exception with value some string
   File "native.py", line 8, in generator
     yield 1
   File "driver.py", line 31, in <module>
     raise Exception
+caught exception with value some other string
   File "native.py", line 10, in generator
     yield 3
   File "native.py", line 31, in wrapper
     return (yield from x)
+caught exception without value
   File "native.py", line 9, in generator
     yield 2
   File "native.py", line 31, in wrapper
     return (yield from x)
-caught exception without value
-caught exception with value some string
-caught exception with value some other string
-caught exception without value
 caught exception with value some string
 exception
 goodbye

mypyc/test-data/run-loops.test

@@ -322,7 +322,7 @@ def iterate_over_tuple(iterable: Tuple[int, int, int]) -> None:
 
 [file driver.py]
 from native import iterate_over_any, iterate_over_iterable, iterate_and_delete, sum_over_values, sum_over_even_values, sum_over_two_values, iterate_over_tuple
-import traceback
+import sys, traceback
 def broken_generator(n):
     num = 0
     while num < n:
@@ -338,61 +338,35 @@ print(sum_over_two_values(d))
 try:
     iterate_over_any(5)
 except TypeError:
-    traceback.print_exc()
+    traceback.print_exc(file=sys.stdout)
 try:
     iterate_over_iterable(broken_generator(5))
 except Exception:
-    traceback.print_exc()
+    traceback.print_exc(file=sys.stdout)
 try:
     iterate_and_delete(d)
 except RuntimeError:
-    traceback.print_exc()
+    traceback.print_exc(file=sys.stdout)
 
 iterate_over_tuple((1, 2, 3))
 [out]
+15
+6
+3
 Traceback (most recent call last):
   File "driver.py", line 16, in <module>
     iterate_over_any(5)
   File "native.py", line 6, in iterate_over_any
     for element in a:
 TypeError: 'int' object is not iterable
-Traceback (most recent call last):
-  File "driver.py", line 20, in <module>
-    iterate_over_iterable(broken_generator(5))
-  File "native.py", line 10, in iterate_over_iterable
-    for element in iterable:
-  File "driver.py", line 8, in broken_generator
-    raise Exception('Exception Manually Raised')
-Exception: Exception Manually Raised
-Traceback (most recent call last):
-  File "driver.py", line 24, in <module>
-    iterate_and_delete(d)
-  File "native.py", line 14, in iterate_and_delete
-    for key in d:
-RuntimeError: dictionary changed size during iteration
-15
-6
-3
 0
 1
 2
 3
 4
-1
-2
-3
-[out version>=3.13]
-Traceback (most recent call last):
-  File "driver.py", line 16, in <module>
-    iterate_over_any(5)
-    ~~~~~~~~~~~~~~~~^^^
-  File "native.py", line 6, in iterate_over_any
-    for element in a:
-TypeError: 'int' object is not iterable
 Traceback (most recent call last):
   File "driver.py", line 20, in <module>
     iterate_over_iterable(broken_generator(5))
-    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
   File "native.py", line 10, in iterate_over_iterable
     for element in iterable:
   File "driver.py", line 8, in broken_generator
@@ -401,18 +375,9 @@ Exception: Exception Manually Raised
 Traceback (most recent call last):
   File "driver.py", line 24, in <module>
     iterate_and_delete(d)
-    ~~~~~~~~~~~~~~~~~~^^^
   File "native.py", line 14, in iterate_and_delete
     for key in d:
 RuntimeError: dictionary changed size during iteration
-15
-6
-3
-0
-1
-2
-3
-4
 1
 2
 3