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[3.14] gh-138944: Fix SyntaxError message for invalid syntax following valid import-as statement (GH-138945) (#140646)

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(cherry picked from commit 3dab11f888)
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Brian Schubert 2025-10-31 06:26:40 -04:00 • committed by GitHub
parent 6c025a040d
commit d0c78a458b
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4 changed files with 60 additions and 19 deletions
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4
Grammar/python.gram
View file

@ -1387,11 +1387,11 @@ invalid_import:
| 'import' token=NEWLINE {
RAISE_SYNTAX_ERROR_STARTING_FROM(token, "Expected one or more names after 'import'") }
invalid_dotted_as_name:
| dotted_name 'as' !(NAME (',' | ')' | NEWLINE)) a=expression {
| dotted_name 'as' !(NAME (',' | ')' | ';' | NEWLINE)) a=expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a,
"cannot use %s as import target", _PyPegen_get_expr_name(a)) }
invalid_import_from_as_name:
| NAME 'as' !(NAME (',' | ')' | NEWLINE)) a=expression {
| NAME 'as' !(NAME (',' | ')' | ';' | NEWLINE)) a=expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a,
"cannot use %s as import target", _PyPegen_get_expr_name(a)) }

19
Lib/test/test_syntax.py
View file

@ -2111,6 +2111,25 @@ SyntaxError: cannot use subscript as import target
Traceback (most recent call last):
SyntaxError: cannot use subscript as import target
# Check that we don't raise a "cannot use name as import target" error
# if there is an error in an unrelated statement after ';'
>>> import a as b; None = 1
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> import a, b as c; d = 1; None = 1
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> from a import b as c; None = 1
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> from a import b, c as d; e = 1; None = 1
Traceback (most recent call last):
SyntaxError: cannot assign to None
# Check that we dont raise the "trailing comma" error if there is more
# input to the left of the valid part that we parsed.

3
Misc/NEWS.d/next/Core_and_Builtins/2025-09-15-13-06-11.gh-issue-138944.PeCgLb.rst Normal file
View file

@ -0,0 +1,3 @@
Fix :exc:`SyntaxError` message when invalid syntax appears on the same line
as a valid ``import ... as ...`` or ``from ... import ... as ...``
statement. Patch by Brian Schubert.

53
Parser/parser.c generated
View file

@ -23692,7 +23692,7 @@ invalid_import_rule(Parser *p)
return _res;
}
// invalid_dotted_as_name: dotted_name 'as' !(NAME (',' | ')' | NEWLINE)) expression
// invalid_dotted_as_name: dotted_name 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression
static void *
invalid_dotted_as_name_rule(Parser *p)
{
@ -23705,12 +23705,12 @@ invalid_dotted_as_name_rule(Parser *p)
}
void * _res = NULL;
int _mark = p->mark;
{ // dotted_name 'as' !(NAME (',' | ')' | NEWLINE)) expression
{ // dotted_name 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression
if (p->error_indicator) {
p->level--;
return NULL;
}
D(fprintf(stderr, "%*c> invalid_dotted_as_name[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "dotted_name 'as' !(NAME (',' | ')' | NEWLINE)) expression"));
D(fprintf(stderr, "%*c> invalid_dotted_as_name[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "dotted_name 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression"));
Token * _keyword;
expr_ty a;
expr_ty dotted_name_var;
@ -23724,7 +23724,7 @@ invalid_dotted_as_name_rule(Parser *p)
(a = expression_rule(p)) // expression
)
{
D(fprintf(stderr, "%*c+ invalid_dotted_as_name[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "dotted_name 'as' !(NAME (',' | ')' | NEWLINE)) expression"));
D(fprintf(stderr, "%*c+ invalid_dotted_as_name[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "dotted_name 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression"));
_res = RAISE_SYNTAX_ERROR_KNOWN_LOCATION ( a , "cannot use %s as import target" , _PyPegen_get_expr_name ( a ) );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
@ -23735,7 +23735,7 @@ invalid_dotted_as_name_rule(Parser *p)
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s invalid_dotted_as_name[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "dotted_name 'as' !(NAME (',' | ')' | NEWLINE)) expression"));
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "dotted_name 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression"));
}
_res = NULL;
done:
@ -23743,7 +23743,7 @@ invalid_dotted_as_name_rule(Parser *p)
return _res;
}
// invalid_import_from_as_name: NAME 'as' !(NAME (',' | ')' | NEWLINE)) expression
// invalid_import_from_as_name: NAME 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression
static void *
invalid_import_from_as_name_rule(Parser *p)
{
@ -23756,12 +23756,12 @@ invalid_import_from_as_name_rule(Parser *p)
}
void * _res = NULL;
int _mark = p->mark;
{ // NAME 'as' !(NAME (',' | ')' | NEWLINE)) expression
{ // NAME 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression
if (p->error_indicator) {
p->level--;
return NULL;
}
D(fprintf(stderr, "%*c> invalid_import_from_as_name[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "NAME 'as' !(NAME (',' | ')' | NEWLINE)) expression"));
D(fprintf(stderr, "%*c> invalid_import_from_as_name[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "NAME 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression"));
Token * _keyword;
expr_ty a;
expr_ty name_var;
@ -23775,7 +23775,7 @@ invalid_import_from_as_name_rule(Parser *p)
(a = expression_rule(p)) // expression
)
{
D(fprintf(stderr, "%*c+ invalid_import_from_as_name[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "NAME 'as' !(NAME (',' | ')' | NEWLINE)) expression"));
D(fprintf(stderr, "%*c+ invalid_import_from_as_name[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "NAME 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression"));
_res = RAISE_SYNTAX_ERROR_KNOWN_LOCATION ( a , "cannot use %s as import target" , _PyPegen_get_expr_name ( a ) );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
@ -23786,7 +23786,7 @@ invalid_import_from_as_name_rule(Parser *p)
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s invalid_import_from_as_name[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "NAME 'as' !(NAME (',' | ')' | NEWLINE)) expression"));
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "NAME 'as' !(NAME (',' | ')' | ';' | NEWLINE)) expression"));
}
_res = NULL;
done:
@ -35834,7 +35834,7 @@ _gather_138_rule(Parser *p)
return _res;
}
// _tmp_139: NAME (',' | ')' | NEWLINE)
// _tmp_139: NAME (',' | ')' | ';' | NEWLINE)
static void *
_tmp_139_rule(Parser *p)
{
@ -35847,27 +35847,27 @@ _tmp_139_rule(Parser *p)
}
void * _res = NULL;
int _mark = p->mark;
{ // NAME (',' | ')' | NEWLINE)
{ // NAME (',' | ')' | ';' | NEWLINE)
if (p->error_indicator) {
p->level--;
return NULL;
}
D(fprintf(stderr, "%*c> _tmp_139[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "NAME (',' | ')' | NEWLINE)"));
D(fprintf(stderr, "%*c> _tmp_139[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "NAME (',' | ')' | ';' | NEWLINE)"));
void *_tmp_173_var;
expr_ty name_var;
if (
(name_var = _PyPegen_name_token(p)) // NAME
&&
(_tmp_173_var = _tmp_173_rule(p)) // ',' | ')' | NEWLINE
(_tmp_173_var = _tmp_173_rule(p)) // ',' | ')' | ';' | NEWLINE
)
{
D(fprintf(stderr, "%*c+ _tmp_139[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "NAME (',' | ')' | NEWLINE)"));
D(fprintf(stderr, "%*c+ _tmp_139[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "NAME (',' | ')' | ';' | NEWLINE)"));
_res = _PyPegen_dummy_name(p, name_var, _tmp_173_var);
goto done;
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s _tmp_139[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "NAME (',' | ')' | NEWLINE)"));
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "NAME (',' | ')' | ';' | NEWLINE)"));
}
_res = NULL;
done:
@ -37788,7 +37788,7 @@ _loop0_172_rule(Parser *p)
return _seq;
}
// _tmp_173: ',' | ')' | NEWLINE
// _tmp_173: ',' | ')' | ';' | NEWLINE
static void *
_tmp_173_rule(Parser *p)
{
@ -37839,6 +37839,25 @@ _tmp_173_rule(Parser *p)
D(fprintf(stderr, "%*c%s _tmp_173[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "')'"));
}
{ // ';'
if (p->error_indicator) {
p->level--;
return NULL;
}
D(fprintf(stderr, "%*c> _tmp_173[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "';'"));
Token * _literal;
if (
(_literal = _PyPegen_expect_token(p, 13)) // token=';'
)
{
D(fprintf(stderr, "%*c+ _tmp_173[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "';'"));
_res = _literal;
goto done;
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s _tmp_173[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "';'"));
}
{ // NEWLINE
if (p->error_indicator) {
p->level--;