[3.9] bpo-41659: Disallow curly brace directly after primary (GH-22996) (#23006)
(cherry picked from commit 15acc4eaba8519d7d5f2acaffde65446b44dcf79)
diff --git a/Grammar/python.gram b/Grammar/python.gram
index 8f4d250..6c36b6a 100644
--- a/Grammar/python.gram
+++ b/Grammar/python.gram
@@ -460,6 +460,7 @@
| AWAIT a=primary { CHECK_VERSION(5, "Await expressions are", _Py_Await(a, EXTRA)) }
| primary
primary[expr_ty]:
+ | invalid_primary # must be before 'primay genexp' because of invalid_genexp
| a=primary '.' b=NAME { _Py_Attribute(a, b->v.Name.id, Load, EXTRA) }
| a=primary b=genexp { _Py_Call(a, CHECK(_PyPegen_singleton_seq(p, b)), NULL, EXTRA) }
| a=primary '(' b=[arguments] ')' {
@@ -664,6 +665,8 @@
RAISE_SYNTAX_ERROR_INVALID_TARGET(DEL_TARGETS, a) }
invalid_block:
| NEWLINE !INDENT { RAISE_INDENTATION_ERROR("expected an indented block") }
+invalid_primary:
+ | primary a='{' { RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "invalid syntax") }
invalid_comprehension:
| ('[' | '(' | '{') a=starred_expression for_if_clauses {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "iterable unpacking cannot be used in comprehension") }