[3.10] gh-92858: Improve error message for some suites with syntax error before ':' (GH-92894). (#94183)

(cherry picked from commit 2fc83ac3af)

Co-authored-by: wookie184 <wookie1840@gmail.com>

Co-authored-by: wookie184 <wookie1840@gmail.com>

Lib/test/test_syntax.py

@@ -403,7 +403,7 @@
 >>> class C(x for x in L):
 ...     pass
 Traceback (most recent call last):
-SyntaxError: expected ':'
+SyntaxError: invalid syntax
 
 >>> def g(*args, **kwargs):
 ...     print(args, sorted(kwargs.items()))
@@ -759,17 +759,22 @@
      ...
    SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?
 
-    Missing ':' before suites:
+Missing ':' before suites:
 
-    >>> def f()
-    ...     pass
-    Traceback (most recent call last):
-    SyntaxError: expected ':'
+   >>> def f()
+   ...     pass
+   Traceback (most recent call last):
+   SyntaxError: expected ':'
 
-    >>> class A
-    ...     pass
-    Traceback (most recent call last):
-    SyntaxError: expected ':'
+   >>> class A
+   ...     pass
+   Traceback (most recent call last):
+   SyntaxError: expected ':'
+
+   >>> class R&D:
+   ...     pass
+   Traceback (most recent call last):
+   SyntaxError: invalid syntax
 
    >>> if 1
    ...   pass
@@ -803,6 +808,11 @@
    Traceback (most recent call last):
    SyntaxError: expected ':'
 
+   >>> for x in range 10:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: invalid syntax
+
    >>> while True
    ...   pass
    Traceback (most recent call last):
@@ -848,6 +858,11 @@
    Traceback (most recent call last):
    SyntaxError: expected ':'
 
+   >>> with block ad something:
+   ...   pass
+   Traceback (most recent call last):
+   SyntaxError: invalid syntax
+
    >>> try
    ...   pass
    Traceback (most recent call last):
@@ -866,6 +881,12 @@
    Traceback (most recent call last):
    SyntaxError: expected ':'
 
+   >>> match x x:
+   ...   case list():
+   ...       pass
+   Traceback (most recent call last):
+   SyntaxError: invalid syntax
+
    >>> match x:
    ...   case list()
    ...       pass