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bpo-40334: produce specialised errors for del #19911

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13 changes: 10 additions & 3 deletions Grammar/python.gram
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Expand Up @@ -583,15 +583,19 @@ ann_assign_subscript_attribute_target[expr_ty]:
| a=t_primary '[' b=slices ']' !t_lookahead { _Py_Subscript(a, b, Store, EXTRA) }

del_targets[asdl_seq*]: a=','.del_target+ [','] { a }
del_target[expr_ty] (memo):
| a=t_primary '.' b=NAME !t_lookahead { _Py_Attribute(a, b->v.Name.id, Del, EXTRA) }
| a=t_primary '[' b=slices ']' !t_lookahead { _Py_Subscript(a, b, Del, EXTRA) }
| del_t_atom
del_t_atom[expr_ty]:
| a=NAME { _PyPegen_set_expr_context(p, a, Del) }
| '(' a=del_target ')' { _PyPegen_set_expr_context(p, a, Del) }
| '(' a=[del_targets] ')' { _Py_Tuple(a, Del, EXTRA) }
| '[' a=[del_targets] ']' { _Py_List(a, Del, EXTRA) }

targets[asdl_seq*]: a=','.target+ [','] { a }
target[expr_ty] (memo):
Expand Down Expand Up @@ -649,3 +653,6 @@ invalid_lambda_star_etc:
invalid_double_type_comments:
| TYPE_COMMENT NEWLINE TYPE_COMMENT NEWLINE INDENT {
RAISE_SYNTAX_ERROR("Cannot have two type comments on def") }
17 changes: 17 additions & 0 deletions Lib/test/test_grammar.py
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Expand Up @@ -801,6 +801,23 @@ def test_del_stmt(self):
del abc
del x, y, (z, xyz)

def test_pass_stmt(self):
# 'pass'
pass
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