autocargo: fix ambiguous type

Summary:
the thrift library target `fbcode//thrift/annotation:all` defines `thrift_srcs = []`. in this case, a 'thrift_build.rs' will be generated that contains the line `let srcs = &[];`. this is of ambiguous type. fix this by ascription: `let srcs: &[&str]`.

before:
```counterexample
$ buck2 run fbcode//common/rust/cargo_from_buck/autocargo:autocargo && (cd fbcode/thrift/lib/rust/annotation/all && THRIFT1=$(buck2 build fbcode//thrift/compiler:thrift --show-full-simple-output) CARGO_TARGET_DIR=~/tmp cargo build)

error[E0282]: type annotations needed for `&[_; 0]`
  --> thrift_build.rs:41:9
   |
41 |     let srcs = &[];
   |         ^^^^   --- type must be known at this point
```

the `autocargo-verification` job should be expected to fail here. this is because it's `autocargo` itself that is being updated by this diff.

Reviewed By: Imxset21

Differential Revision: D57521067

fbshipit-source-id: 02f697a63898d5a27a611938d185ff4642edab2f

third-party/thrift/src/thrift/lib/rust/annotation/all/clients/thrift_build.rs

@@ -38,6 +38,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("all__types");
     conf.clients_crate("all__clients");
-    let srcs = &[];
+    let srcs: &[&str] = &[];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/all/mocks/thrift_build.rs

@@ -38,6 +38,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("all__types");
     conf.clients_crate("all__clients");
-    let srcs = &[];
+    let srcs: &[&str] = &[];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/all/services/thrift_build.rs

@@ -38,6 +38,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("all__types");
     conf.clients_crate("all__clients");
-    let srcs = &[];
+    let srcs: &[&str] = &[];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/all/thrift_build.rs

@@ -38,6 +38,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("all__types");
     conf.clients_crate("all__clients");
-    let srcs = &[];
+    let srcs: &[&str] = &[];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/compat/clients/thrift_build.rs

@@ -30,6 +30,6 @@ fn main() {
     conf.types_crate("compat__types");
     conf.clients_crate("compat__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../../annotation/compat.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/compat.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/compat/mocks/thrift_build.rs

@@ -30,6 +30,6 @@ fn main() {
     conf.types_crate("compat__types");
     conf.clients_crate("compat__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../../annotation/compat.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/compat.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/compat/services/thrift_build.rs

@@ -30,6 +30,6 @@ fn main() {
     conf.types_crate("compat__types");
     conf.clients_crate("compat__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../../annotation/compat.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/compat.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/compat/thrift_build.rs

@@ -30,6 +30,6 @@ fn main() {
     conf.types_crate("compat__types");
     conf.clients_crate("compat__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../annotation/compat.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/compat.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/cpp/clients/thrift_build.rs

@@ -31,6 +31,6 @@ fn main() {
     conf.types_crate("cpp__types");
     conf.clients_crate("cpp__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../../annotation/cpp.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/cpp.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/cpp/mocks/thrift_build.rs

@@ -31,6 +31,6 @@ fn main() {
     conf.types_crate("cpp__types");
     conf.clients_crate("cpp__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../../annotation/cpp.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/cpp.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/cpp/services/thrift_build.rs

@@ -31,6 +31,6 @@ fn main() {
     conf.types_crate("cpp__types");
     conf.clients_crate("cpp__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../../annotation/cpp.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/cpp.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/cpp/thrift_build.rs

@@ -31,6 +31,6 @@ fn main() {
     conf.types_crate("cpp__types");
     conf.clients_crate("cpp__clients");
     conf.options("deprecated_default_enum_min_i32");
-    let srcs = &["../../../../annotation/cpp.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/cpp.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/go/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("go__types");
     conf.clients_crate("go__clients");
-    let srcs = &["../../../../../annotation/go.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/go.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/go/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("go__types");
     conf.clients_crate("go__clients");
-    let srcs = &["../../../../../annotation/go.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/go.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/go/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("go__types");
     conf.clients_crate("go__clients");
-    let srcs = &["../../../../../annotation/go.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/go.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/go/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("go__types");
     conf.clients_crate("go__clients");
-    let srcs = &["../../../../annotation/go.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/go.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/hack/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("hack__types");
     conf.clients_crate("hack__clients");
-    let srcs = &["../../../../../annotation/hack.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/hack.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/hack/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("hack__types");
     conf.clients_crate("hack__clients");
-    let srcs = &["../../../../../annotation/hack.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/hack.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/hack/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("hack__types");
     conf.clients_crate("hack__clients");
-    let srcs = &["../../../../../annotation/hack.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/hack.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/hack/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("hack__types");
     conf.clients_crate("hack__clients");
-    let srcs = &["../../../../annotation/hack.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/hack.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/java/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("java__types");
     conf.clients_crate("java__clients");
-    let srcs = &["../../../../../annotation/java.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/java.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/java/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("java__types");
     conf.clients_crate("java__clients");
-    let srcs = &["../../../../../annotation/java.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/java.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/java/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("java__types");
     conf.clients_crate("java__clients");
-    let srcs = &["../../../../../annotation/java.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/java.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/java/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("java__types");
     conf.clients_crate("java__clients");
-    let srcs = &["../../../../annotation/java.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/java.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/python/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("python__types");
     conf.clients_crate("python__clients");
-    let srcs = &["../../../../../annotation/python.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/python.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/python/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("python__types");
     conf.clients_crate("python__clients");
-    let srcs = &["../../../../../annotation/python.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/python.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/python/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("python__types");
     conf.clients_crate("python__clients");
-    let srcs = &["../../../../../annotation/python.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/python.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/python/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("python__types");
     conf.clients_crate("python__clients");
-    let srcs = &["../../../../annotation/python.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/python.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/rust/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("rust__types");
     conf.clients_crate("rust__clients");
-    let srcs = &["../../../../../annotation/rust.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/rust.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/rust/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("rust__types");
     conf.clients_crate("rust__clients");
-    let srcs = &["../../../../../annotation/rust.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/rust.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/rust/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("rust__types");
     conf.clients_crate("rust__clients");
-    let srcs = &["../../../../../annotation/rust.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/rust.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/rust/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("rust__types");
     conf.clients_crate("rust__clients");
-    let srcs = &["../../../../annotation/rust.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/rust.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/scope/clients/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("scope__types");
     conf.clients_crate("scope__clients");
-    let srcs = &["../../../../../annotation/scope.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/scope.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/scope/mocks/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("scope__types");
     conf.clients_crate("scope__clients");
-    let srcs = &["../../../../../annotation/scope.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/scope.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/scope/services/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("scope__types");
     conf.clients_crate("scope__clients");
-    let srcs = &["../../../../../annotation/scope.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/scope.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/scope/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("scope__types");
     conf.clients_crate("scope__clients");
-    let srcs = &["../../../../annotation/scope.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/scope.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/thrift/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("thrift__types");
     conf.clients_crate("thrift__clients");
-    let srcs = &["../../../../../annotation/thrift.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/thrift/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("thrift__types");
     conf.clients_crate("thrift__clients");
-    let srcs = &["../../../../../annotation/thrift.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/thrift/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("thrift__types");
     conf.clients_crate("thrift__clients");
-    let srcs = &["../../../../../annotation/thrift.thrift"];
+    let srcs: &[&str] = &["../../../../../annotation/thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/annotation/thrift/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("thrift__types");
     conf.clients_crate("thrift__clients");
-    let srcs = &["../../../../annotation/thrift.thrift"];
+    let srcs: &[&str] = &["../../../../annotation/thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/deterministic_hash/src/tests/clients/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("teststructs__types");
     conf.clients_crate("teststructs__clients");
-    let srcs = &["../test_structs.thrift"];
+    let srcs: &[&str] = &["../test_structs.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/deterministic_hash/src/tests/mocks/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("teststructs__types");
     conf.clients_crate("teststructs__clients");
-    let srcs = &["../test_structs.thrift"];
+    let srcs: &[&str] = &["../test_structs.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/deterministic_hash/src/tests/services/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("teststructs__types");
     conf.clients_crate("teststructs__clients");
-    let srcs = &["../test_structs.thrift"];
+    let srcs: &[&str] = &["../test_structs.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/deterministic_hash/src/tests/thrift_build.rs

@@ -28,6 +28,6 @@ fn main() {
     conf.base_path(base_path);
     conf.types_crate("teststructs__types");
     conf.clients_crate("teststructs__clients");
-    let srcs = &["test_structs.thrift"];
+    let srcs: &[&str] = &["test_structs.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/src/dep_tests/cargo_thrift/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.types_crate("test_if__types");
     conf.clients_crate("test_if__clients");
     conf.options("deprecated_default_enum_min_i32,serde");
-    let srcs = &["../../test_thrift.thrift"];
+    let srcs: &[&str] = &["../../test_thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/src/dep_tests/cargo_thrift/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.types_crate("test_if__types");
     conf.clients_crate("test_if__clients");
     conf.options("deprecated_default_enum_min_i32,serde");
-    let srcs = &["../../test_thrift.thrift"];
+    let srcs: &[&str] = &["../../test_thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/src/dep_tests/cargo_thrift/services/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.types_crate("test_if__types");
     conf.clients_crate("test_if__clients");
     conf.options("deprecated_default_enum_min_i32,serde");
-    let srcs = &["../../test_thrift.thrift"];
+    let srcs: &[&str] = &["../../test_thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/src/dep_tests/cargo_thrift/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.types_crate("test_if__types");
     conf.clients_crate("test_if__clients");
     conf.options("deprecated_default_enum_min_i32,serde");
-    let srcs = &["../test_thrift.thrift"];
+    let srcs: &[&str] = &["../test_thrift.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/src/dep_tests/clients/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.types_crate("test_deprecated_optional_with_default_is_some_if__types");
     conf.clients_crate("test_deprecated_optional_with_default_is_some_if__clients");
     conf.options("deprecated_optional_with_default_is_some");
-    let srcs = &["../test_deprecated_optional_with_default_is_some.thrift"];
+    let srcs: &[&str] = &["../test_deprecated_optional_with_default_is_some.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }

third-party/thrift/src/thrift/lib/rust/src/dep_tests/mocks/thrift_build.rs

@@ -29,6 +29,6 @@ fn main() {
     conf.types_crate("test_deprecated_optional_with_default_is_some_if__types");
     conf.clients_crate("test_deprecated_optional_with_default_is_some_if__clients");
     conf.options("deprecated_optional_with_default_is_some");
-    let srcs = &["../test_deprecated_optional_with_default_is_some.thrift"];
+    let srcs: &[&str] = &["../test_deprecated_optional_with_default_is_some.thrift"];
     conf.run(srcs).expect("Failed while running thrift compilation");
 }