Avoid need for {D,Subd}iagnosticMessage imports.

The `fluent_messages!` macro produces uses of
`crate::{D,Subd}iagnosticMessage`, which means that every crate using
the macro must have this import:
```
use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
```

This commit changes the macro to instead use
`rustc_errors::{D,Subd}iagnosticMessage`, which avoids the need for the
imports.

Author: nnethercote

compiler/rustc_ast_lowering/src/lib.rs

@@ -55,9 +55,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::sorted_map::SortedMap;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::sync::Lrc;
-use rustc_errors::{
-    DiagnosticArgFromDisplay, DiagnosticMessage, Handler, StashKey, SubdiagnosticMessage,
-};
+use rustc_errors::{DiagnosticArgFromDisplay, Handler, StashKey};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, LifetimeRes, Namespace, PartialRes, PerNS, Res};

compiler/rustc_ast_passes/src/lib.rs

@@ -15,7 +15,6 @@
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 pub mod ast_validation;

compiler/rustc_attr/src/lib.rs

@@ -14,7 +14,6 @@
 #[macro_use]
 extern crate rustc_macros;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 mod builtin;

compiler/rustc_borrowck/src/lib.rs

@@ -22,7 +22,7 @@ extern crate tracing;
 
 use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
 use rustc_data_structures::graph::dominators::Dominators;
-use rustc_errors::{Diagnostic, DiagnosticBuilder, DiagnosticMessage, SubdiagnosticMessage};
+use rustc_errors::{Diagnostic, DiagnosticBuilder};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;

compiler/rustc_builtin_macros/src/lib.rs

@@ -23,7 +23,6 @@ extern crate tracing;
 
 use crate::deriving::*;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_expand::base::{MacroExpanderFn, ResolverExpand, SyntaxExtensionKind};
 use rustc_expand::proc_macro::BangProcMacro;
 use rustc_fluent_macro::fluent_messages;

compiler/rustc_codegen_gcc/src/lib.rs

@@ -101,7 +101,7 @@ use rustc_codegen_ssa::target_features::supported_target_features;
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::IntoDynSyncSend;
 use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, ThinBufferMethods, WriteBackendMethods};
-use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, Handler, SubdiagnosticMessage};
+use rustc_errors::{ErrorGuaranteed, Handler};
 use rustc_fluent_macro::fluent_messages;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};

compiler/rustc_codegen_llvm/src/lib.rs

@@ -40,7 +40,7 @@ use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::ModuleCodegen;
 use rustc_codegen_ssa::{CodegenResults, CompiledModule};
 use rustc_data_structures::fx::FxIndexMap;
-use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, FatalError, Handler, SubdiagnosticMessage};
+use rustc_errors::{ErrorGuaranteed, FatalError, Handler};
 use rustc_fluent_macro::fluent_messages;
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};

compiler/rustc_codegen_ssa/src/lib.rs

@@ -27,7 +27,6 @@ extern crate rustc_middle;
 use rustc_ast as ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync::Lrc;
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir::def_id::CrateNum;
 use rustc_middle::dep_graph::WorkProduct;

compiler/rustc_const_eval/src/lib.rs

@@ -39,7 +39,6 @@ pub mod util;
 
 pub use errors::ReportErrorExt;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_middle::{ty, util::Providers};
 

compiler/rustc_driver_impl/src/lib.rs

@@ -28,7 +28,7 @@ use rustc_data_structures::profiling::{
 use rustc_data_structures::sync::SeqCst;
 use rustc_errors::registry::{InvalidErrorCode, Registry};
 use rustc_errors::{markdown, ColorConfig};
-use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, Handler, PResult, SubdiagnosticMessage};
+use rustc_errors::{ErrorGuaranteed, Handler, PResult};
 use rustc_feature::find_gated_cfg;
 use rustc_fluent_macro::fluent_messages;
 use rustc_interface::util::{self, collect_crate_types, get_codegen_backend};

compiler/rustc_expand/src/lib.rs

@@ -23,7 +23,6 @@ extern crate tracing;
 
 extern crate proc_macro as pm;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 mod placeholders;

compiler/rustc_fluent_macro/src/fluent.rs

@@ -57,20 +57,20 @@ fn finish(body: TokenStream, resource: TokenStream) -> proc_macro::TokenStream {
             /// identifiers for different subdiagnostic kinds.
             pub mod _subdiag {
                 /// Default for `#[help]`
-                pub const help: crate::SubdiagnosticMessage =
-                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("help"));
+                pub const help: rustc_errors::SubdiagnosticMessage =
+                    rustc_errors::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("help"));
                 /// Default for `#[note]`
-                pub const note: crate::SubdiagnosticMessage =
-                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("note"));
+                pub const note: rustc_errors::SubdiagnosticMessage =
+                    rustc_errors::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("note"));
                 /// Default for `#[warn]`
-                pub const warn: crate::SubdiagnosticMessage =
-                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("warn"));
+                pub const warn: rustc_errors::SubdiagnosticMessage =
+                    rustc_errors::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("warn"));
                 /// Default for `#[label]`
-                pub const label: crate::SubdiagnosticMessage =
-                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("label"));
+                pub const label: rustc_errors::SubdiagnosticMessage =
+                    rustc_errors::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("label"));
                 /// Default for `#[suggestion]`
-                pub const suggestion: crate::SubdiagnosticMessage =
-                    crate::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("suggestion"));
+                pub const suggestion: rustc_errors::SubdiagnosticMessage =
+                    rustc_errors::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed("suggestion"));
             }
         }
     }
@@ -248,11 +248,8 @@ pub(crate) fn fluent_messages(input: proc_macro::TokenStream) -> proc_macro::Tok
                 format!("Constant referring to Fluent message `{name}` from `{crate_name}`");
             constants.extend(quote! {
                 #[doc = #docstr]
-                pub const #snake_name: crate::DiagnosticMessage =
-                    crate::DiagnosticMessage::FluentIdentifier(
-                        std::borrow::Cow::Borrowed(#name),
-                        None
-                    );
+                pub const #snake_name: rustc_errors::DiagnosticMessage =
+                    rustc_errors::DiagnosticMessage::FluentIdentifier(std::borrow::Cow::Borrowed(#name), None);
             });
 
             for Attribute { id: Identifier { name: attr_name }, .. } in attributes {
@@ -279,10 +276,8 @@ pub(crate) fn fluent_messages(input: proc_macro::TokenStream) -> proc_macro::Tok
                 );
                 constants.extend(quote! {
                     #[doc = #msg]
-                    pub const #snake_name: crate::SubdiagnosticMessage =
-                        crate::SubdiagnosticMessage::FluentAttr(
-                            std::borrow::Cow::Borrowed(#attr_name)
-                        );
+                    pub const #snake_name: rustc_errors::SubdiagnosticMessage =
+                        rustc_errors::SubdiagnosticMessage::FluentAttr(std::borrow::Cow::Borrowed(#attr_name));
                 });
             }
 

compiler/rustc_hir_analysis/src/lib.rs

@@ -99,7 +99,6 @@ pub mod structured_errors;
 mod variance;
 
 use rustc_errors::ErrorGuaranteed;
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir as hir;
 use rustc_middle::middle;

compiler/rustc_hir_typeck/src/lib.rs

@@ -52,10 +52,7 @@ use crate::expectation::Expectation;
 use crate::fn_ctxt::RawTy;
 use crate::gather_locals::GatherLocalsVisitor;
 use rustc_data_structures::unord::UnordSet;
-use rustc_errors::{
-    struct_span_err, DiagnosticId, DiagnosticMessage, ErrorGuaranteed, MultiSpan,
-    SubdiagnosticMessage,
-};
+use rustc_errors::{struct_span_err, DiagnosticId, ErrorGuaranteed, MultiSpan};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};

compiler/rustc_incremental/src/lib.rs

@@ -28,7 +28,6 @@ pub use persist::save_work_product_index;
 pub use persist::setup_dep_graph;
 pub use persist::LoadResult;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 fluent_messages! { "../messages.ftl" }

compiler/rustc_infer/src/lib.rs

@@ -37,7 +37,6 @@ extern crate tracing;
 #[macro_use]
 extern crate rustc_middle;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 mod errors;

compiler/rustc_interface/src/lib.rs

@@ -13,7 +13,6 @@
 #[macro_use]
 extern crate tracing;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 mod callbacks;

compiler/rustc_lint/src/lib.rs

@@ -90,7 +90,6 @@ mod unused;
 
 pub use array_into_iter::ARRAY_INTO_ITER;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir::def_id::LocalModDefId;
 use rustc_middle::query::Providers;

compiler/rustc_metadata/src/lib.rs

@@ -31,7 +31,6 @@ extern crate rustc_middle;
 extern crate tracing;
 
 pub use rmeta::provide;
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 mod dependency_format;

compiler/rustc_middle/src/lib.rs

@@ -77,7 +77,6 @@ extern crate tracing;
 #[macro_use]
 extern crate smallvec;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 #[cfg(test)]

compiler/rustc_mir_build/src/lib.rs

@@ -24,7 +24,6 @@ mod thir;
 
 use rustc_middle::query::Providers;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 fluent_messages! { "../messages.ftl" }

compiler/rustc_mir_dataflow/src/lib.rs

@@ -13,7 +13,6 @@ extern crate tracing;
 #[macro_use]
 extern crate rustc_middle;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_middle::ty;
 

compiler/rustc_mir_transform/src/lib.rs

@@ -118,7 +118,6 @@ use rustc_const_eval::transform::promote_consts;
 use rustc_const_eval::transform::validate;
 use rustc_mir_dataflow::rustc_peek;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 fluent_messages! { "../messages.ftl" }

compiler/rustc_monomorphize/src/lib.rs

@@ -10,7 +10,6 @@ extern crate tracing;
 #[macro_use]
 extern crate rustc_middle;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::query::{Providers, TyCtxtAt};

compiler/rustc_parse/src/lib.rs

@@ -20,7 +20,6 @@ use rustc_ast::{AttrItem, Attribute, MetaItem};
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{Diagnostic, FatalError, Level, PResult};
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_session::parse::ParseSess;
 use rustc_span::{FileName, SourceFile, Span};

compiler/rustc_passes/src/lib.rs

@@ -23,7 +23,6 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate tracing;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_middle::query::Providers;
 

compiler/rustc_privacy/src/lib.rs

@@ -19,7 +19,6 @@ use rustc_ast::MacroDef;
 use rustc_attr as attr;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::intern::Interned;
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};

compiler/rustc_query_system/src/lib.rs

@@ -14,7 +14,6 @@ extern crate rustc_data_structures;
 #[macro_use]
 extern crate rustc_macros;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 pub mod cache;

compiler/rustc_resolve/src/lib.rs

@@ -37,9 +37,7 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet};
 use rustc_data_structures::intern::Interned;
 use rustc_data_structures::steal::Steal;
 use rustc_data_structures::sync::{FreezeReadGuard, Lrc};
-use rustc_errors::{
-    Applicability, DiagnosticBuilder, DiagnosticMessage, ErrorGuaranteed, SubdiagnosticMessage,
-};
+use rustc_errors::{Applicability, DiagnosticBuilder, ErrorGuaranteed};
 use rustc_expand::base::{DeriveResolutions, SyntaxExtension, SyntaxExtensionKind};
 use rustc_feature::BUILTIN_ATTRIBUTES;
 use rustc_fluent_macro::fluent_messages;

compiler/rustc_session/src/lib.rs

@@ -20,7 +20,6 @@ pub mod errors;
 #[macro_use]
 extern crate tracing;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 pub mod utils;

compiler/rustc_trait_selection/src/lib.rs

@@ -37,7 +37,6 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate smallvec;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 
 pub mod errors;

compiler/rustc_ty_utils/src/lib.rs

@@ -24,7 +24,6 @@ extern crate rustc_middle;
 #[macro_use]
 extern crate tracing;
 
-use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_fluent_macro::fluent_messages;
 use rustc_middle::query::Providers;
 

tests/ui-fulldeps/fluent-messages/test.rs

@@ -2,7 +2,7 @@
 
 #![feature(rustc_private)]
 #![crate_type = "lib"]
-
+extern crate rustc_errors;
 extern crate rustc_fluent_macro;
 use rustc_fluent_macro::fluent_messages;