feat(natu): ignore imported let bindings

src/natu/natu_test.rs

@@ -199,6 +199,24 @@ in
     Ok(())
 }
 
+#[gtest]
+fn natu_accepts_single_use_import_binding() -> googletest::Result<()> {
+    let report = natu::future_sight(vec![SourceFile {
+        path: PathBuf::from("testdata/import_binding.nix"),
+        source: r#"
+let
+  imported = import ./module.nix { };
+in
+imported
+"#
+        .into(),
+    }])
+    .or_fail()?;
+
+    expect_that!(report.is_clean(), is_true());
+    Ok(())
+}
+
 #[gtest]
 fn natu_reports_single_use_binding() -> googletest::Result<()> {
     let report = natu::future_sight(vec![SourceFile {