Regression test for doc annotations parsing failure

Cargo.toml

@@ -54,6 +54,7 @@ members = [
   "fixtures/regressions/unary-result-alias",
   "fixtures/regressions/nested-module-import",
   "fixtures/regressions/wrong-lower-check",
+  "fixtures/regressions/doc-annotation-fails",
   "fixtures/trait-methods",
   "fixtures/uitests",
   "fixtures/uniffi-fixture-time",

fixtures/regressions/doc-annotation-fails/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "uniffi-fixture-regression-doc-annotation-fails"
+version = "0.22.0"
+authors = ["Firefox Sync Team <[email protected]>"]
+edition = "2018"
+license = "MPL-2.0"
+publish = false
+
+[lib]
+name = "uniffi_regression_test_doc_annotation_fails"
+crate-type = ["lib", "cdylib"]
+
+[dependencies]
+uniffi = { workspace = true }
+
+[build-dependencies]
+uniffi = { workspace = true, features = ["build"] }
+
+[dev-dependencies]
+uniffi = { workspace = true, features = ["bindgen-tests"] }

fixtures/regressions/doc-annotation-fails/README.md

@@ -0,0 +1,13 @@
+# Doc annotation in proc-macro fails
+
+Reported in [#2134](https://github.com/mozilla/uniffi-rs/issues/2134):
+
+In v0.27 parsing of `#[doc]` annotations fail to parse if they contain anything but plain strings.
+
+```
+error: Cannot parse doc attribute
+ --> fixtures/regressions/doc-annotation-fails/src/lib.rs:5:1
+  |
+5 | #[doc = std::concat!("A", "has a", "B")]
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+```

fixtures/regressions/doc-annotation-fails/build.rs

@@ -0,0 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+fn main() {
+    uniffi::generate_scaffolding("src/test.udl").unwrap();
+}

fixtures/regressions/doc-annotation-fails/src/lib.rs

@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#[doc = std::concat!("A", "has a", "B")]
+#[derive(uniffi::Enum)]
+pub enum ConcattedDocEnum {
+    B,
+}
+
+#[doc = "A has a B"]
+#[derive(uniffi::Enum)]
+pub enum PlainDocAnnotation {
+    B,
+}
+
+uniffi::include_scaffolding!("test");

fixtures/regressions/doc-annotation-fails/src/test.udl

@@ -0,0 +1 @@
+namespace doc_annotation_fails { };