[3.10] bpo-45727: Make the syntax error for missing comma more consistent (GH-29427) (GH-29647)

(cherry picked from commit 546cefcda75d7150b55c8bc1724bea35a1e12890)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 04c883c..4c18a59 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -226,13 +226,14 @@ def testSyntaxErrorOffset(self):
         check(b'Python = "\xcf\xb3\xf2\xee\xed" +', 1, 18)
         check('x = "a', 1, 5)
         check('lambda x: x = 2', 1, 1)
-        check('f{a + b + c}', 1, 2)
+        check('f{a + b + c}', 1, 1)
         check('[file for str(file) in []\n])', 1, 11)
         check('a = « hello » « world »', 1, 5)
         check('[\nfile\nfor str(file)\nin\n[]\n]', 3, 5)
         check('[file for\n str(file) in []]', 2, 2)
         check("ages = {'Alice'=22, 'Bob'=23}", 1, 16)
         check('match ...:\n    case {**rest, "key": value}:\n        ...', 2, 19)
+        check("a b c d e f", 1, 1)
 
         # Errors thrown by compile.c
         check('class foo:return 1', 1, 11)