bpo-40585: Normalize errors messages in codeop when comparing them

Lib/test/test_codeop.py

@@ -288,6 +288,15 @@ def test_invalid(self):
 
  ai("[i for i in range(10)] = (1, 2, 3)")
 
+ def test_invalid_exec(self):
+ ai = self.assertInvalid
+ ai("raise = 4", symbol="exec")
+ ai('def a-b', symbol='exec')
+ ai('await?', symbol='exec')
+ ai('=!=', symbol='exec')
+ ai('a await raise b', symbol='exec')
+ ai('a await raise b?+1', symbol='exec')
+
  def test_filename(self):
  self.assertEqual(compile_command("a = 1\n", "abc").co_filename,
  compile("a = 1\n", "abc", 'single').co_filename)

Misc/NEWS.d/next/Core and Builtins/2020-05-11-00-19-42.bpo-40585.yusknY.rst

@@ -0,0 +1,2 @@
+Fixed a bug when using :func:`codeop.compile_command` that was causing
+exceptions to be swallowed with the new parser. Patch by Pablo Galindo

Parser/pegen/pegen.c

@@ -310,6 +310,12 @@ get_error_line(char *buffer, int is_file)
  newline = strchr(buffer, '\n');
  }
 
+ if (is_file) {
+ while (newline > buffer && newline[-1] == '\n') {
+ --newline;
+ }
+ }
+
  if (newline) {
  return PyUnicode_DecodeUTF8(buffer, newline - buffer, "replace");
  }