Annotated assignment in a match block does not generate SETUP_ANNOTATIONS

Bug report

Compiling the following code:

match 0:
    case 0:
        x: int = 1

generates

  1           0 LOAD_CONST               0 (0)

  2           2 LOAD_CONST               0 (0)
              4 COMPARE_OP               2 (==)
              6 POP_JUMP_IF_FALSE       12 (to 24)

  3           8 LOAD_CONST               1 (1)
             10 STORE_NAME               0 (x)
             12 LOAD_NAME                1 (int)
             14 LOAD_NAME                2 (__annotations__)
             16 LOAD_CONST               2 ('x')
             18 STORE_SUBSCR
             20 LOAD_CONST               3 (None)
             22 RETURN_VALUE

  2     >>   24 LOAD_CONST               3 (None)
             26 RETURN_VALUE

There is no SETUP_ANNOTATIONS opcode generated despite the __annotations__ access later on. (Found via google/pytype#1435 - for some reason this does not generate a runtime error, but it does cause issues for tools like pytype.)

Your environment

cpython 3.10

Linked PRs

FWIW, it's a runtime error when the module is imported, not run as main:

$ cat lib.py
match 0:
    case 0:
        x: int = 1

$ cat main.py
import lib

$ python main.py
Traceback (most recent call last):
  File "main.py", line 1, in <module>
    import lib
  File "lib.py", line 3, in <module>
    x: int = 1
NameError: name '__annotations__' is not defined

@JelleZijlstra

I think find_ann in compile.c needs to be taught about Match_kind.

Looks like @JelleZijlstra picked this up already. Feel free to ping me for review!

pythongh-105164: Detect annotations inside match blocks

gh-105164: Detect annotations inside match blocks (#105177)

pythongh-105164: Detect annotations inside match blocks (pythonGH-105177

[3.11] pythongh-105164: Detect annotations inside match blocks (pytho…

[3.12] gh-105164: Detect annotations inside match blocks (GH-105177) (#…

[3.11] gh-105164: Detect annotations inside match blocks (GH-105177). (…

Thanks, looks like this is fixed

Navigation Menu

Repository navigation

Annotated assignment in a `match` block does not generate `SETUP_ANNOTATIONS` #105164

Bug report

Your environment

Linked PRs

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Annotated assignment in a match block does not generate SETUP_ANNOTATIONS #105164

Description

Bug report

Your environment

Linked PRs

Activity

yilei commented on May 31, 2023

brandtbucher commented on May 31, 2023

hauntsaninja commented on Sep 7, 2023

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions

Annotated assignment in a `match` block does not generate `SETUP_ANNOTATIONS` #105164