Auto merge of #108682 - est31:simplify_dirs, r=davidtwco

Simplify message paths

This makes it easier to open the messages file. Right now I have to first click on the `locales` dir to open it, and then on the `en-US.ftl` file. `Cargo.toml` and `build.rs` files are also in the top level, and I think there should not be more than one file, so a directory isn't really needed. The [chosen strategy for pontoon adoption](https://rust-lang.zulipchat.com/#narrow/stream/336883-i18n/topic/pontoon.20and.20next.20steps) is out of tree. Even if this descision is changed in the future, the `messages.ftl` approach is also compatible with non-english translations living in-tree, as long as the non-english translations don't live in the `compiler/rustc_foo/` directories but in different ones. That would also be helpful for grepability purposes.

The commit was the result of automated changes:

```
for p in compiler/rustc_*; do mv $p/locales/en-US.ftl $p/messages.ftl; rmdir $p/locales; done

for p in compiler/rustc_*; do sed -i "s#\.\./locales/en-US.ftl#../messages.ftl#" $p/src/lib.rs; done
```

r? `@davidtwco`

compiler/rustc_ast_lowering/src/lib.rs

@@ -92,7 +92,7 @@ mod lifetime_collector;
 mod pat;
 mod path;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 struct LoweringContext<'a, 'hir> {
     tcx: TyCtxt<'hir>,

compiler/rustc_ast_passes/src/lib.rs

@@ -21,4 +21,4 @@ pub mod feature_gate;
 pub mod node_count;
 pub mod show_span;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_attr/src/lib.rs

@@ -26,4 +26,4 @@ pub use rustc_ast::attr::*;
 
 pub(crate) use rustc_ast::HashStableContext;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_borrowck/src/lib.rs

@@ -100,7 +100,7 @@ use places_conflict::{places_conflict, PlaceConflictBias};
 use region_infer::RegionInferenceContext;
 use renumber::RegionCtxt;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 // FIXME(eddyb) perhaps move this somewhere more centrally.
 #[derive(Debug)]

compiler/rustc_builtin_macros/src/lib.rs

@@ -56,7 +56,7 @@ pub mod proc_macro_harness;
 pub mod standard_library_imports;
 pub mod test_harness;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub fn register_builtin_macros(resolver: &mut dyn ResolverExpand) {
     let mut register = |name, kind| resolver.register_builtin_macro(name, kind);

compiler/rustc_codegen_gcc/src/lib.rs

@@ -87,7 +87,7 @@ use rustc_span::Symbol;
 use rustc_span::fatal_error::FatalError;
 use tempfile::TempDir;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub struct PrintOnPanic<F: Fn() -> String>(pub F);
 

compiler/rustc_codegen_llvm/src/lib.rs

@@ -84,7 +84,7 @@ mod type_of;
 mod va_arg;
 mod value;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 #[derive(Clone)]
 pub struct LlvmCodegenBackend(());

compiler/rustc_codegen_ssa/src/lib.rs

@@ -56,7 +56,7 @@ pub mod mono_item;
 pub mod target_features;
 pub mod traits;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub struct ModuleCodegen<M> {
     /// The name of the module. When the crate may be saved between

compiler/rustc_const_eval/src/lib.rs

@@ -39,7 +39,7 @@ use rustc_macros::fluent_messages;
 use rustc_middle::ty;
 use rustc_middle::ty::query::Providers;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub fn provide(providers: &mut Providers) {
     const_eval::provide(providers);

compiler/rustc_driver_impl/src/lib.rs

@@ -64,7 +64,7 @@ use crate::session_diagnostics::{
     RLinkWrongFileType, RlinkNotAFile, RlinkUnableToRead,
 };
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub static DEFAULT_LOCALE_RESOURCES: &[&str] = &[
     // tidy-alphabetical-start

compiler/rustc_error_messages/src/lib.rs

@@ -34,7 +34,7 @@ use intl_memoizer::IntlLangMemoizer;
 pub use fluent_bundle::{self, types::FluentType, FluentArgs, FluentError, FluentValue};
 pub use unic_langid::{langid, LanguageIdentifier};
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub type FluentBundle = fluent_bundle::bundle::FluentBundle<FluentResource, IntlLangMemoizer>;
 

compiler/rustc_errors/src/lib.rs

@@ -76,7 +76,7 @@ pub use snippet::Style;
 pub type PErr<'a> = DiagnosticBuilder<'a, ErrorGuaranteed>;
 pub type PResult<'a, T> = Result<T, PErr<'a>>;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 // `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
 // (See also the comment on `DiagnosticBuilderInner`'s `diagnostic` field.)

compiler/rustc_expand/src/lib.rs

@@ -64,4 +64,4 @@ mod mut_visit {
     mod tests;
 }
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_hir_analysis/src/lib.rs

@@ -120,7 +120,7 @@ use std::ops::Not;
 use astconv::AstConv;
 use bounds::Bounds;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi, span: Span) {
     const CONVENTIONS_UNSTABLE: &str = "`C`, `cdecl`, `win64`, `sysv64` or `efiapi`";

compiler/rustc_hir_typeck/src/lib.rs

@@ -75,7 +75,7 @@ use rustc_session::Session;
 use rustc_span::def_id::{DefId, LocalDefId};
 use rustc_span::{sym, Span};
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 #[macro_export]
 macro_rules! type_error_struct {

compiler/rustc_incremental/src/lib.rs

@@ -35,4 +35,4 @@ pub use persist::{build_dep_graph, load_dep_graph, DepGraphFuture};
 use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_macros::fluent_messages;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_infer/src/lib.rs

@@ -41,4 +41,4 @@ mod errors;
 pub mod infer;
 pub mod traits;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_interface/src/lib.rs

@@ -31,4 +31,4 @@ pub use queries::Queries;
 #[cfg(test)]
 mod tests;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_lint/src/lib.rs

@@ -126,7 +126,7 @@ pub use rustc_session::lint::Level::{self, *};
 pub use rustc_session::lint::{BufferedEarlyLint, FutureIncompatibleInfo, Lint, LintId};
 pub use rustc_session::lint::{LintArray, LintPass};
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub fn provide(providers: &mut Providers) {
     levels::provide(providers);

compiler/rustc_metadata/src/lib.rs

@@ -47,4 +47,4 @@ pub use fs::{emit_wrapper_file, METADATA_FILENAME};
 pub use native_libs::find_native_static_library;
 pub use rmeta::{encode_metadata, EncodedMetadata, METADATA_HEADER};
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_middle/src/lib.rs

@@ -109,4 +109,4 @@ pub mod util {
 // Allows macros to refer to this crate as `::rustc_middle`
 extern crate self as rustc_middle;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_mir_build/src/lib.rs

@@ -28,7 +28,7 @@ use rustc_middle::ty::query::Providers;
 use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_macros::fluent_messages;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub fn provide(providers: &mut Providers) {
     providers.check_match = thir::pattern::check_match;

compiler/rustc_mir_dataflow/src/lib.rs

@@ -46,7 +46,7 @@ pub mod storage;
 pub mod un_derefer;
 pub mod value_analysis;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub(crate) mod indexes {
     pub(crate) use super::move_paths::MovePathIndex;

compiler/rustc_monomorphize/src/lib.rs

@@ -23,7 +23,7 @@ mod partitioning;
 mod polymorphize;
 mod util;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 fn custom_coerce_unsize_info<'tcx>(
     tcx: TyCtxtAt<'tcx>,

compiler/rustc_parse/src/lib.rs

@@ -36,7 +36,7 @@ pub mod validate_attr;
 
 mod errors;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 // A bunch of utility functions of the form `parse_<thing>_from_<source>`
 // where <thing> includes crate, expr, item, stmt, tts, and one that

compiler/rustc_passes/src/lib.rs

@@ -42,7 +42,7 @@ pub mod stability;
 mod upvars;
 mod weak_lang_items;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub fn provide(providers: &mut Providers) {
     check_attr::provide(providers);

compiler/rustc_plugin_impl/src/lib.rs

@@ -18,7 +18,7 @@ use rustc_macros::fluent_messages;
 mod errors;
 pub mod load;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 /// Structure used to register plugins.
 ///

compiler/rustc_privacy/src/lib.rs

@@ -46,7 +46,7 @@ use errors::{
     UnnamedItemIsPrivate,
 };
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 ////////////////////////////////////////////////////////////////////////////////
 /// Generic infrastructure used to implement specific visitors below.

compiler/rustc_query_system/src/lib.rs

@@ -30,4 +30,4 @@ pub use error::LayoutOfDepth;
 pub use error::QueryOverflow;
 pub use values::Value;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_resolve/src/lib.rs

@@ -81,7 +81,7 @@ mod late;
 mod macros;
 pub mod rustdoc;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 enum Weak {
     Yes,

compiler/rustc_session/src/lib.rs

@@ -42,7 +42,7 @@ pub mod output;
 
 pub use getopts;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 /// Requirements for a `StableHashingContext` to be used in this crate.
 /// This is a hack to allow using the `HashStable_Generic` derive macro

compiler/rustc_symbol_mangling/src/lib.rs

@@ -119,7 +119,7 @@ pub mod errors;
 pub mod test;
 pub mod typeid;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 /// This function computes the symbol name for the given `instance` and the
 /// given instantiating crate. That is, if you know that instance X is

compiler/rustc_trait_selection/src/lib.rs

@@ -44,4 +44,4 @@ pub mod infer;
 pub mod solve;
 pub mod traits;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }

compiler/rustc_ty_utils/src/lib.rs

@@ -33,7 +33,7 @@ pub mod representability;
 mod structural_match;
 mod ty;
 
-fluent_messages! { "../locales/en-US.ftl" }
+fluent_messages! { "../messages.ftl" }
 
 pub fn provide(providers: &mut Providers) {
     abi::provide(providers);