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gh-104572: Improve error messages for invalid constructs in PEP 695 contexts by JelleZijlstra · Pull Request #104573 · python/cpython · GitHub

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gh-104572: Improve error messages for invalid constructs in PEP 695 contexts #104573

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Merged
JelleZijlstra merged 2 commits into from
May 17, 2023
Conversation 4 Commits 2 Checks 0 Files changed
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gh-104572: Improve error messages for invalid constructs in PEP 695 contexts #104573

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gh-104572: Improve error messages for invalid constructs in PEP 695 c…
JelleZijlstra May 17, 2023
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JelleZijlstra May 17, 2023
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62 changes: 62 additions & 0 deletions Lib/test/test_syntax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1877,6 +1877,68 @@ def f(x: *b)
^^^^^^^^^^^
SyntaxError: bytes can only contain ASCII literal characters

Invalid expressions in type scopes:

>>> type A[T: (x:=3)] = int
Traceback (most recent call last):
...
SyntaxError: named expression cannot be used within a TypeVar bound

>>> type A[T: (yield 3)] = int
Traceback (most recent call last):
...
SyntaxError: yield expression cannot be used within a TypeVar bound

>>> type A[T: (await 3)] = int
Traceback (most recent call last):
...
SyntaxError: await expression cannot be used within a TypeVar bound

>>> type A[T: (yield from [])] = int
Traceback (most recent call last):
...
SyntaxError: yield expression cannot be used within a TypeVar bound

>>> type A = (x := 3)
Traceback (most recent call last):
...
SyntaxError: named expression cannot be used within a type alias

>>> type A = (yield 3)
Traceback (most recent call last):
...
SyntaxError: yield expression cannot be used within a type alias

>>> type A = (await 3)
Traceback (most recent call last):
...
SyntaxError: await expression cannot be used within a type alias

>>> type A = (yield from [])
Traceback (most recent call last):
...
SyntaxError: yield expression cannot be used within a type alias

>>> class A[T]((x := 3)): ...
Traceback (most recent call last):
...
SyntaxError: named expression cannot be used within the definition of a generic

>>> class A[T]((yield 3)): ...
Traceback (most recent call last):
...
SyntaxError: yield expression cannot be used within the definition of a generic

>>> class A[T]((await 3)): ...
Traceback (most recent call last):
...
SyntaxError: await expression cannot be used within the definition of a generic

>>> class A[T]((yield from [])): ...
Traceback (most recent call last):
...
SyntaxError: yield expression cannot be used within the definition of a generic

"""

import re
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-05-16-19-17-48.gh-issue-104572.eBZQYS.rst
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@@ -0,0 +1,2 @@
Improve syntax error message for invalid constructs in :pep:`695` contexts
and in annotations when ``from __future__ import annotations`` is active.
8 changes: 4 additions & 4 deletions Python/symtable.c
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Expand Up @@ -45,16 +45,16 @@
"assignment expression cannot be used in a comprehension iterable expression"

#define ANNOTATION_NOT_ALLOWED \
"'%s' can not be used within an annotation"
"%s cannot be used within an annotation"

#define TYPEVAR_BOUND_NOT_ALLOWED \
"'%s' can not be used within a TypeVar bound"
"%s cannot be used within a TypeVar bound"

#define TYPEALIAS_NOT_ALLOWED \
"'%s' can not be used within a type alias"
"%s cannot be used within a type alias"

#define TYPEPARAM_NOT_ALLOWED \
"'%s' can not be used within the definition of a generic"
"%s cannot be used within the definition of a generic"

#define DUPLICATE_TYPE_PARAM \
"duplicate type parameter '%U'"
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