#19751 `# pants: no-infer-dep` not always respected by the 2.17 Rust parser Issue created by lowvoltage Describe the bug The new Rust inference parser disrespects a

# pants: no-infer-dep

on a conditional import:

if TYPE_CHECKING:
    from a import ClassA  # pants: no-infer-dep

Dependencies' diff below:

❯ pants --python-infer-no-use-rust-parser peek main.py
[
  {
    "address": "//main.py",
    "target_type": "python_source",
    "dependencies": [],
    "dependencies_raw": null,

❯ pants --python-infer-use-rust-parser peek main.py
[
  {
    "address": "//main.py",
    "target_type": "python_source",
    "dependencies": [
      "//a.py"
    ],
    "dependencies_raw": null,
    "description": null,

Note and workarounds This seems to break only when

# pants: no-infer-dep

is on the last line inside the

if

block: • With mulitple import statements, only the last one is handled incorrectly • A multiline import seems to work fine

from a import (
        ClassA,  # pants: no-infer-dep
    )

• A placeholder

pass

statement at the end of the

if TYPE_CHECKING

block also results in a correct behavior Pants version 2.17.0 OS Both: MacOS and Linux Additional info Minimalist setup to reproduce

main.py

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from a import ClassA  # pants: no-infer-dep

print('Hello, world!')

a.py

class ClassA:
    pass

pants.toml

[GLOBAL]
pants_version = "2.17.0"
backend_packages = ["pants.backend.python"]

[python]
interpreter_constraints = ["==3.9.*"]

BUILD

python_sources()

pantsbuild/pants