Platform markers are ignored when syncing optional self-dependencies

[befelix]

In the following minimal pyproject.toml file, we are creating a package where the self optional dependency that depends on the base extra (the tomli package) through a self-dependency together with a platform marker that is not satisfied on my Linux machine. When running uv sync --extra self the packages from the base extra get installed, even though the platform marker should exclude them.

$ uv sync --extra self

Using CPython 3.13.0
Creating virtual environment at: .venv
Resolved 2 packages in 5ms
Installed 1 package in 2ms
 + tomli==2.2.1

[project]
name = "testing"
version = "0.1.0"
requires-python = ">=3.11"
dependencies = []

[project.optional-dependencies]
base = [
    "tomli>=2.2.1",
]
self = [
    "testing[base]; platform_system == 'Windows'",
]

[tool.uv.sources]
testing = { workspace = true }

• platform: Linux
• uv version: 0.5.5

[BhupalPrajapati]

[project.optional-dependencies]
base = [
"tomli>=2.2.1; platform_system == 'Windows'",
]
self = [
"testing[base]",
]

[charliermarsh]

I got it.

[charliermarsh]

(Good bug!)