Address review comments

Author: brianschubert

Grammar/python.gram

@@ -1503,7 +1503,7 @@ invalid_case_block:
     | "case" patterns guard? NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
     | a="case" patterns guard? ':' NEWLINE !INDENT {
         RAISE_INDENTATION_ERROR("expected an indented block after 'case' statement on line %d", a->lineno) }
-    | !"case" { RAISE_SYNTAX_ERROR_ON_NEXT_TOKEN("expected 'case' statement inside 'match' statement") }
+    | !("case" | DEDENT) { RAISE_SYNTAX_ERROR_ON_NEXT_TOKEN("expected 'case' statement inside 'match' statement") }
 invalid_as_pattern:
     | or_pattern 'as' a="_" { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot use '_' as a target") }
     | or_pattern 'as' a=expression {

Lib/test/test_syntax.py

@@ -419,6 +419,16 @@
 Traceback (most recent call last):
 SyntaxError: invalid syntax. Perhaps you forgot a comma?
 
+# Make sure syntax error after match block doesn't raise a specialized
+# 'expected case statement' error.
+
+>>> match 1:
+...     case 1:
+...         pass
+... 1 2
+Traceback (most recent call last):
+SyntaxError: invalid syntax
+
 From compiler_complex_args():
 
 >>> def f(None=1):
@@ -3472,7 +3482,7 @@ def test_match_stmt_contains_invalid_stmt(self):
             "a = 1",
             "if a:",
             "else:",
-            "match 1:"
+            "match 1:",
             "pass",
             "return",
             "return 2",