various: translation resources from cg backend

Extend `CodegenBackend` trait with a function returning the translation
resources from the codegen backend, which can be added to the complete
list of resources provided to the emitter.

Signed-off-by: David Wood <david.wood@huawei.com>

23 files changed, 86 insertions, 48 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs
index c7fe382bac4..5ba568bfd6e 100644
--- a/compiler/rustc_codegen_cranelift/src/lib.rs
+++ b/compiler/rustc_codegen_cranelift/src/lib.rs
@@ -172,6 +172,11 @@ pub struct CraneliftCodegenBackend {
 }
 
 impl CodegenBackend for CraneliftCodegenBackend {
+    fn locale_resource(&self) -> &'static str {
+        // FIXME(rust-lang/rust#100717) - cranelift codegen backend is not yet translated
+        ""
+    }
+
     fn init(&self, sess: &Session) {
         use rustc_session::config::Lto;
         match sess.lto() {
diff --git a/compiler/rustc_codegen_gcc/src/lib.rs b/compiler/rustc_codegen_gcc/src/lib.rs
index 546c892aae5..44538b41528 100644
--- a/compiler/rustc_codegen_gcc/src/lib.rs
+++ b/compiler/rustc_codegen_gcc/src/lib.rs
@@ -103,6 +103,10 @@ pub struct GccCodegenBackend {
 }
 
 impl CodegenBackend for GccCodegenBackend {
+    fn locale_resource(&self) -> &'static str {
+        crate::DEFAULT_LOCALE_RESOURCE
+    }
+
     fn init(&self, sess: &Session) {
         if sess.lto() != Lto::No {
             sess.emit_warning(LTONotSupported {});
diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
index de886c881a5..c41e74c51a0 100644
--- a/compiler/rustc_codegen_llvm/src/lib.rs
+++ b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -249,6 +249,10 @@ impl LlvmCodegenBackend {
 }
 
 impl CodegenBackend for LlvmCodegenBackend {
+    fn locale_resource(&self) -> &'static str {
+        crate::DEFAULT_LOCALE_RESOURCE
+    }
+
     fn init(&self, sess: &Session) {
         llvm_util::init(sess); // Make sure llvm is inited
     }
diff --git a/compiler/rustc_codegen_ssa/src/traits/backend.rs b/compiler/rustc_codegen_ssa/src/traits/backend.rs
index 5c35070ea66..64bebe50ddb 100644
--- a/compiler/rustc_codegen_ssa/src/traits/backend.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/backend.rs
@@ -57,6 +57,10 @@ impl<'tcx, T> Backend<'tcx> for T where
 }
 
 pub trait CodegenBackend {
+    /// Locale resources for diagnostic messages - a string the content of the Fluent resource.
+    /// Called before `init` so that all other functions are able to emit translatable diagnostics.
+    fn locale_resource(&self) -> &'static str;
+
     fn init(&self, _sess: &Session) {}
     fn print(&self, _req: PrintRequest, _sess: &Session) {}
     fn target_features(&self, _sess: &Session, _allow_unstable: bool) -> Vec<Symbol> {
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index f696cc20e23..54bcb154da2 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -362,7 +362,7 @@ fn run_compiler(
             }
 
             // Make sure name resolution and macro expansion is run.
-            queries.global_ctxt()?;
+            queries.global_ctxt()?.enter(|tcx| tcx.resolver_for_lowering(()));
 
             if callbacks.after_expansion(compiler, queries) == Compilation::Stop {
                 return early_exit();
@@ -1204,7 +1204,7 @@ static DEFAULT_HOOK: LazyLock<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send +
 /// hook.
 pub fn report_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES, false);
+        rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES.to_vec(), false);
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 13952f8456e..40ed10e7165 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -223,7 +223,7 @@ pub type LazyFallbackBundle = Lrc<Lazy<FluentBundle, impl FnOnce() -> FluentBund
 /// Return the default `FluentBundle` with standard "en-US" diagnostic messages.
 #[instrument(level = "trace")]
 pub fn fallback_fluent_bundle(
-    resources: &'static [&'static str],
+    resources: Vec<&'static str>,
     with_directionality_markers: bool,
 ) -> LazyFallbackBundle {
     Lrc::new(Lazy::new(move || {
diff --git a/compiler/rustc_errors/src/json/tests.rs b/compiler/rustc_errors/src/json/tests.rs
index bbfad26c6f0..671dc449eaa 100644
--- a/compiler/rustc_errors/src/json/tests.rs
+++ b/compiler/rustc_errors/src/json/tests.rs
@@ -42,11 +42,11 @@ impl<T: Write> Write for Shared<T> {
 
 /// Test the span yields correct positions in JSON.
 fn test_positions(code: &str, span: (u32, u32), expected_output: SpanTestData) {
-    static TEST_LOCALE_RESOURCES: &[&str] = &[crate::DEFAULT_LOCALE_RESOURCE];
     rustc_span::create_default_session_globals_then(|| {
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         sm.new_source_file(Path::new("test.rs").to_owned().into(), code.to_owned());
-        let fallback_bundle = crate::fallback_fluent_bundle(TEST_LOCALE_RESOURCES, false);
+        let fallback_bundle =
+            crate::fallback_fluent_bundle(vec![crate::DEFAULT_LOCALE_RESOURCE], false);
 
         let output = Arc::new(Mutex::new(Vec::new()));
         let je = JsonEmitter::new(
diff --git a/compiler/rustc_expand/src/parse/tests.rs b/compiler/rustc_expand/src/parse/tests.rs
index a416300ba7e..8b37728b60f 100644
--- a/compiler/rustc_expand/src/parse/tests.rs
+++ b/compiler/rustc_expand/src/parse/tests.rs
@@ -17,11 +17,11 @@ use rustc_span::{BytePos, FileName, Pos, Span};
 
 use std::path::PathBuf;
 
-static TEST_LOCALE_RESOURCES: &[&str] =
-    &[crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn sess() -> ParseSess {
-    ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty())
+    ParseSess::new(
+        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty(),
+    )
 }
 
 /// Parses an item.
diff --git a/compiler/rustc_expand/src/tests.rs b/compiler/rustc_expand/src/tests.rs
index bd1b3ff28b7..14918d3c190 100644
--- a/compiler/rustc_expand/src/tests.rs
+++ b/compiler/rustc_expand/src/tests.rs
@@ -34,7 +34,10 @@ where
 
 /// Maps a string to tts, using a made-up filename.
 pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
-    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let ps = ParseSess::new(
+        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty(),
+    );
     source_file_to_stream(
         &ps,
         ps.source_map().new_source_file(PathBuf::from("bogofile").into(), source_str),
@@ -45,7 +48,10 @@ pub(crate) fn string_to_stream(source_str: String) -> TokenStream {
 
 /// Parses a string, returns a crate.
 pub(crate) fn string_to_crate(source_str: String) -> ast::Crate {
-    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let ps = ParseSess::new(
+        vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty(),
+    );
     with_error_checking_parse(source_str, &ps, |p| p.parse_crate_mod())
 }
 
@@ -123,14 +129,14 @@ impl<T: Write> Write for Shared<T> {
     }
 }
 
-static TEST_LOCALE_RESOURCES: &[&str] =
-    &[crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn test_harness(file_text: &str, span_labels: Vec<SpanLabel>, expected_output: &str) {
     create_default_session_if_not_set_then(|_| {
         let output = Arc::new(Mutex::new(Vec::new()));
 
-        let fallback_bundle = rustc_errors::fallback_fluent_bundle(TEST_LOCALE_RESOURCES, false);
+        let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+            vec![crate::DEFAULT_LOCALE_RESOURCE, rustc_parse::DEFAULT_LOCALE_RESOURCE],
+            false,
+        );
         let source_map = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         source_map.new_source_file(Path::new("test.rs").to_owned().into(), file_text.to_owned());
 
diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index 8ef1df39933..71a72036994 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -50,7 +50,7 @@ fn mk_session(matches: getopts::Matches) -> (Session, CfgSpecs) {
         output_file: None,
         temps_dir,
     };
-    let sess = build_session(sessopts, io, None, registry, &[], Default::default(), None, None);
+    let sess = build_session(sessopts, io, None, registry, vec![], Default::default(), None, None);
     (sess, cfg)
 }
 
diff --git a/compiler/rustc_interface/src/util.rs b/compiler/rustc_interface/src/util.rs
index 20ba5c6eb2d..e5d2fb2ea28 100644
--- a/compiler/rustc_interface/src/util.rs
+++ b/compiler/rustc_interface/src/util.rs
@@ -90,6 +90,9 @@ pub fn create_session(
         }
     };
 
+    let mut locale_resources = Vec::from(locale_resources);
+    locale_resources.push(codegen_backend.locale_resource());
+
     let mut sess = session::build_session(
         sopts,
         io,
diff --git a/compiler/rustc_session/src/parse.rs b/compiler/rustc_session/src/parse.rs
index 9d0ef9f2f12..4e8c3f73e29 100644
--- a/compiler/rustc_session/src/parse.rs
+++ b/compiler/rustc_session/src/parse.rs
@@ -226,10 +226,7 @@ pub struct ParseSess {
 
 impl ParseSess {
     /// Used for testing.
-    pub fn new(
-        locale_resources: &'static [&'static str],
-        file_path_mapping: FilePathMapping,
-    ) -> Self {
+    pub fn new(locale_resources: Vec<&'static str>, file_path_mapping: FilePathMapping) -> Self {
         let fallback_bundle = fallback_fluent_bundle(locale_resources, false);
         let sm = Lrc::new(SourceMap::new(file_path_mapping));
         let handler = Handler::with_tty_emitter(
@@ -268,7 +265,7 @@ impl ParseSess {
     }
 
     pub fn with_silent_emitter(fatal_note: Option<String>) -> Self {
-        let fallback_bundle = fallback_fluent_bundle(&[], false);
+        let fallback_bundle = fallback_fluent_bundle(Vec::new(), false);
         let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
         let fatal_handler =
             Handler::with_tty_emitter(ColorConfig::Auto, false, None, None, None, fallback_bundle);
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 0be057de6d7..446ba63ed1c 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -1341,7 +1341,7 @@ pub fn build_session(
     io: CompilerIO,
     bundle: Option<Lrc<rustc_errors::FluentBundle>>,
     registry: rustc_errors::registry::Registry,
-    fluent_resources: &'static [&'static str],
+    fluent_resources: Vec<&'static str>,
     driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
     file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
     target_override: Option<Target>,
@@ -1630,13 +1630,11 @@ pub enum IncrCompSession {
     InvalidBecauseOfErrors { session_directory: PathBuf },
 }
 
-// FIXME(#100717): early errors aren't translated at the moment, so this is fine, but it will need
-// to reference every crate that might emit an early error for translation to work.
-static EARLY_ERROR_LOCALE_RESOURCE: &'static [&'static str] =
-    &[rustc_errors::DEFAULT_LOCALE_RESOURCE];
-
 fn early_error_handler(output: config::ErrorOutputType) -> rustc_errors::Handler {
-    let fallback_bundle = fallback_fluent_bundle(EARLY_ERROR_LOCALE_RESOURCE, false);
+    // FIXME(#100717): early errors aren't translated at the moment, so this is fine, but it will
+    // need to reference every crate that might emit an early error for translation to work.
+    let fallback_bundle =
+        fallback_fluent_bundle(vec![rustc_errors::DEFAULT_LOCALE_RESOURCE], false);
     let emitter: Box<dyn Emitter + sync::Send> = match output {
         config::ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
diff --git a/src/librustdoc/clean/render_macro_matchers.rs b/src/librustdoc/clean/render_macro_matchers.rs
index 068d596f52f..ef38ca3c16c 100644
--- a/src/librustdoc/clean/render_macro_matchers.rs
+++ b/src/librustdoc/clean/render_macro_matchers.rs
@@ -63,7 +63,8 @@ fn snippet_equal_to_token(tcx: TyCtxt<'_>, matcher: &TokenTree) -> Option<String
     let snippet = source_map.span_to_snippet(span).ok()?;
 
     // Create a Parser.
-    let sess = ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES, FilePathMapping::empty());
+    let sess =
+        ParseSess::new(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(), FilePathMapping::empty());
     let file_name = source_map.span_to_filename(span);
     let mut parser =
         match rustc_parse::maybe_new_parser_from_source_str(&sess, file_name, snippet.clone()) {
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index cb0feed08a0..fbfc58a436b 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -115,8 +115,10 @@ pub(crate) fn new_handler(
     diagnostic_width: Option<usize>,
     unstable_opts: &UnstableOptions,
 ) -> rustc_errors::Handler {
-    let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+        rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+        false,
+    );
     let emitter: Box<dyn Emitter + sync::Send> = match error_format {
         ErrorOutputType::HumanReadable(kind) => {
             let (short, color_config) = kind.unzip();
diff --git a/src/librustdoc/doctest.rs b/src/librustdoc/doctest.rs
index 509240a5194..8a73d25d3f0 100644
--- a/src/librustdoc/doctest.rs
+++ b/src/librustdoc/doctest.rs
@@ -546,8 +546,10 @@ pub(crate) fn make_test(
             // Any errors in parsing should also appear when the doctest is compiled for real, so just
             // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
             let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-            let fallback_bundle =
-                rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+            let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+                rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+                false,
+            );
             supports_color = EmitterWriter::stderr(
                 ColorConfig::Auto,
                 None,
@@ -742,8 +744,10 @@ fn check_if_attr_is_complete(source: &str, edition: Edition) -> bool {
             // Any errors in parsing should also appear when the doctest is compiled for real, so just
             // send all the errors that librustc_ast emits directly into a `Sink` instead of stderr.
             let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-            let fallback_bundle =
-                rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+            let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+                rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+                false,
+            );
 
             let emitter = EmitterWriter::new(
                 Box::new(io::sink()),
diff --git a/src/librustdoc/passes/lint/check_code_block_syntax.rs b/src/librustdoc/passes/lint/check_code_block_syntax.rs
index 71f922662da..26fbb03a43e 100644
--- a/src/librustdoc/passes/lint/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/lint/check_code_block_syntax.rs
@@ -33,8 +33,10 @@ fn check_rust_syntax(
     code_block: RustCodeBlock,
 ) {
     let buffer = Lrc::new(Lock::new(Buffer::default()));
-    let fallback_bundle =
-        rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+        rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+        false,
+    );
     let emitter = BufferEmitter { buffer: Lrc::clone(&buffer), fallback_bundle };
 
     let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
diff --git a/src/tools/clippy/clippy_lints/src/doc.rs b/src/tools/clippy/clippy_lints/src/doc.rs
index 660dd8391a3..6fdb7de25cc 100644
--- a/src/tools/clippy/clippy_lints/src/doc.rs
+++ b/src/tools/clippy/clippy_lints/src/doc.rs
@@ -704,8 +704,10 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
                 let filename = FileName::anon_source_code(&code);
 
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-                let fallback_bundle =
-                    rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+                let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+                    rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+                    false
+                );
                 let emitter = EmitterWriter::new(
                     Box::new(io::sink()),
                     None,
diff --git a/src/tools/clippy/src/driver.rs b/src/tools/clippy/src/driver.rs
index 45209fb8519..9ac849aecf1 100644
--- a/src/tools/clippy/src/driver.rs
+++ b/src/tools/clippy/src/driver.rs
@@ -209,7 +209,10 @@ fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     // Separate the output with an empty line
     eprintln!();
 
-    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+        rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+        false
+    );
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,
diff --git a/src/tools/rustfmt/src/parse/session.rs b/src/tools/rustfmt/src/parse/session.rs
index a7a363d47ba..a64963db6a7 100644
--- a/src/tools/rustfmt/src/parse/session.rs
+++ b/src/tools/rustfmt/src/parse/session.rs
@@ -123,8 +123,10 @@ fn default_handler(
     let emitter = if hide_parse_errors {
         silent_emitter()
     } else {
-        let fallback_bundle =
-            rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
+        let fallback_bundle = rustc_errors::fallback_fluent_bundle(
+            rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(),
+            false,
+        );
         Box::new(EmitterWriter::stderr(
             color_cfg,
             Some(source_map.clone()),
diff --git a/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs b/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs
index 3aa57d58908..8dac53c2a62 100644
--- a/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs
+++ b/tests/run-make-fulldeps/hotplug_codegen_backend/the_backend.rs
@@ -27,6 +27,8 @@ use std::any::Any;
 struct TheBackend;
 
 impl CodegenBackend for TheBackend {
+    fn locale_resource(&self) -> &'static str { "" }
+
     fn codegen_crate<'a, 'tcx>(
         &self,
         tcx: TyCtxt<'tcx>,
diff --git a/tests/ui-fulldeps/mod_dir_path_canonicalized.rs b/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
index f9d6fc8bae1..ddc86c1dc31 100644
--- a/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
+++ b/tests/ui-fulldeps/mod_dir_path_canonicalized.rs
@@ -30,10 +30,11 @@ pub fn main() {
     assert_eq!(gravy::foo(), 10);
 }
 
-static TEST_LOCALE_RESOURCES: &[&str] = &[rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn parse() {
-    let parse_session = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let parse_session = ParseSess::new(
+        vec![rustc_parse::DEFAULT_LOCALE_RESOURCE],
+        FilePathMapping::empty()
+    );
 
     let path = Path::new(file!());
     let path = path.canonicalize().unwrap();
diff --git a/tests/ui-fulldeps/pprust-expr-roundtrip.rs b/tests/ui-fulldeps/pprust-expr-roundtrip.rs
index 5c8aa865163..e417a6a833b 100644
--- a/tests/ui-fulldeps/pprust-expr-roundtrip.rs
+++ b/tests/ui-fulldeps/pprust-expr-roundtrip.rs
@@ -219,10 +219,8 @@ fn main() {
     rustc_span::create_default_session_globals_then(|| run());
 }
 
-static TEST_LOCALE_RESOURCES: &[&str] = &[rustc_parse::DEFAULT_LOCALE_RESOURCE];
-
 fn run() {
-    let ps = ParseSess::new(TEST_LOCALE_RESOURCES, FilePathMapping::empty());
+    let ps = ParseSess::new(vec![rustc_parse::DEFAULT_LOCALE_RESOURCE], FilePathMapping::empty());
 
     iter_exprs(2, &mut |mut e| {
         // If the pretty printer is correct, then `parse(print(e))` should be identical to `e`,