Regression in 1.42.2: Code from start of macro becomes part of the snapshot

[konstin]

What happened?

#720 introduced a regression: While previously --accept worked correctly, it now adds some Rust code in the prefix and indents incorrectly:

@@ -68,18 +68,18 @@ fn compatible_python_incompatible_override() -> Result<()> {
     let output = uv_snapshot!(filters, command(&context, python_versions)
         .arg("--python-version=3.9")
         , @r"
-                 success: false
-                 exit_code: 1
-                 ----- stdout -----
-
-                 ----- stderr -----
-                 warning: The requested Python version 3.9 is not available; 3.11.[X] will be used to build dependencies instead.
-                   × No solution found when resolving dependencies:
-                   ╰─▶ Because the requested Python version (>=3.9) does not satisfy Python>=3.10 and package-a==1.0.0 depends on Python>=3.10, we can conclude that package-a==1.0.0 cannot be used.
-                       And because you require package-a==1.0.0, we can conclude that your requirements are unsatisfiable.
-
-                       hint: The `--python-version` value (>=3.9) includes Python versions that are not supported by your dependencies (e.g., package-a==1.0.0 only supports >=3.10). Consider using a higher `--python-version` value.
-                 "
+    let output = success: false
+    let output = exit_code: 1
+    let output = ----- stdout -----
+
+    let output = ----- stderr -----
+    let output = warning: The requested Python version 3.9 is not available; 3.11.[X] will be used to build dependencies instead.
+    let output =   × No solution found when resolving dependencies:
+    let output =   ╰─▶ Because the requested Python version (>=3.9) does not satisfy Python>=3.10 and package-a==1.0.0 depends on Python>=3.10, we can conclude that package-a==1.0.0 cannot be used.
+    let output =       And because you require package-a==1.0.0, we can conclude that your requirements are unsatisfiable.
+
+    let output =       hint: The `--python-version` value (>=3.9) includes Python versions that are not supported by your dependencies (e.g., package-a==1.0.0 only supports >=3.10). Consider using a higher `--python-version` value.
+    let output = "
     );
 
     output.assert().failure();

CC @nicholassm

Reproduction steps

git clone https://github.com/astral-sh/uv
git checkout eaa4651df074fcc1f55b1e81735e4a9199e8b430
cargo binstall -y cargo-insta@1.42.1
bash scripts/sync_scenarios.sh # GOOD
cargo binstall -y cargo-insta@1.42.2
bash scripts/sync_scenarios.sh # BAD

Bisecting with the insta (cargo install --path cargo-insta/ --bin cargo-insta) narrowed this down to #720.

rustc Version

rustc 1.91.1 (ed61e7d7e 2025-11-07)

insta Version

1.43.2, doesn't change the regression

cargo insta --version output

1.42.1, 1.42.2, latest main (6cb41af)

What did you expect?

The snapshot doesn't pull in Rust code.

[max-sixty]

apologies, will look now

[max-sixty]

fixed & released a patch version. this has been broken for a while!