Auto merge of #107679 - est31:less_import_overhead, r=compiler-errors

Less import overhead for errors

This removes huge (3+ lines) import lists found in files that had their error reporting migrated. These lists are bad for developer workflows as adding, removing, or editing a single error's name might cause a chain reaction that bloats the git diff. As the error struct names are long, the likelihood of such chain reactions is high.

Follows the suggestion by `@Nilstrieb` in the [zulip thread](https://rust-lang.zulipchat.com/#narrow/stream/147480-t-compiler.2Fwg-diagnostics/topic/massive.20use.20statements) to replace the `use errors::{FooErr, BarErr};` with `use errors;` and then changing to `errors::FooErr` on the usage sites.

I have used sed to do most of the changes, i.e. something like:

```
sed -i -E 's/(create_err|create_feature_err|emit_err|create_note|emit_fatal|emit_warning)\(([[:alnum:]]+|[A-Z][[:alnum:]:]*)( \{|\))/\1(errors::\2\3/' path/to/file.rs
```

& then I manually fixed the errors that occured. Most manual changes were required in `compiler/rustc_parse/src/parser/expr.rs`.

r? `@compiler-errors`

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -22,13 +22,7 @@ use rustc_span::{BytePos, Pos, Span, Symbol};
 use rustc_trait_selection::traits::SelectionContext;
 
 use super::ConstCx;
-use crate::errors::{
-    InteriorMutabilityBorrow, InteriorMutableDataRefer, MutDerefErr, NonConstFmtMacroCall,
-    NonConstFnCall, NonConstOpErr, PanicNonStrErr, RawPtrToIntErr, StaticAccessErr,
-    TransientMutBorrowErr, TransientMutBorrowErrRaw, UnallowedFnPointerCall,
-    UnallowedHeapAllocations, UnallowedInlineAsm, UnallowedMutableRefs, UnallowedMutableRefsRaw,
-    UnallowedOpInConstContext, UnstableConstFn,
-};
+use crate::errors;
 use crate::util::{call_kind, CallDesugaringKind, CallKind};
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -99,7 +93,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallIndirect {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(UnallowedFnPointerCall { span, kind: ccx.const_kind() })
+        ccx.tcx.sess.create_err(errors::UnallowedFnPointerCall { span, kind: ccx.const_kind() })
     }
 }
 
@@ -303,10 +297,11 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                 diag_trait(&mut err, self_ty, tcx.require_lang_item(LangItem::Deref, Some(span)));
                 err
             }
-            _ if tcx.opt_parent(callee) == tcx.get_diagnostic_item(sym::ArgumentV1Methods) => {
-                ccx.tcx.sess.create_err(NonConstFmtMacroCall { span, kind: ccx.const_kind() })
-            }
-            _ => ccx.tcx.sess.create_err(NonConstFnCall {
+            _ if tcx.opt_parent(callee) == tcx.get_diagnostic_item(sym::ArgumentV1Methods) => ccx
+                .tcx
+                .sess
+                .create_err(errors::NonConstFmtMacroCall { span, kind: ccx.const_kind() }),
+            _ => ccx.tcx.sess.create_err(errors::NonConstFnCall {
                 span,
                 def_path_str: ccx.tcx.def_path_str_with_substs(callee, substs),
                 kind: ccx.const_kind(),
@@ -351,7 +346,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallUnstable {
         let mut err = ccx
             .tcx
             .sess
-            .create_err(UnstableConstFn { span, def_path: ccx.tcx.def_path_str(def_id) });
+            .create_err(errors::UnstableConstFn { span, def_path: ccx.tcx.def_path_str(def_id) });
 
         if ccx.is_const_stable_const_fn() {
             err.help("const-stable functions can only call other const-stable functions");
@@ -387,11 +382,11 @@ impl<'tcx> NonConstOp<'tcx> for Generator {
         let msg = format!("{}s are not allowed in {}s", self.0.descr(), ccx.const_kind());
         if let hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Block) = self.0 {
             ccx.tcx.sess.create_feature_err(
-                UnallowedOpInConstContext { span, msg },
+                errors::UnallowedOpInConstContext { span, msg },
                 sym::const_async_blocks,
             )
         } else {
-            ccx.tcx.sess.create_err(UnallowedOpInConstContext { span, msg })
+            ccx.tcx.sess.create_err(errors::UnallowedOpInConstContext { span, msg })
         }
     }
 }
@@ -404,7 +399,7 @@ impl<'tcx> NonConstOp<'tcx> for HeapAllocation {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(UnallowedHeapAllocations {
+        ccx.tcx.sess.create_err(errors::UnallowedHeapAllocations {
             span,
             kind: ccx.const_kind(),
             teach: ccx.tcx.sess.teach(&error_code!(E0010)).then_some(()),
@@ -420,7 +415,7 @@ impl<'tcx> NonConstOp<'tcx> for InlineAsm {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(UnallowedInlineAsm { span, kind: ccx.const_kind() })
+        ccx.tcx.sess.create_err(errors::UnallowedInlineAsm { span, kind: ccx.const_kind() })
     }
 }
 
@@ -471,7 +466,9 @@ impl<'tcx> NonConstOp<'tcx> for TransientCellBorrow {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_feature_err(InteriorMutabilityBorrow { span }, sym::const_refs_to_cell)
+        ccx.tcx
+            .sess
+            .create_feature_err(errors::InteriorMutabilityBorrow { span }, sym::const_refs_to_cell)
     }
 }
 
@@ -488,14 +485,14 @@ impl<'tcx> NonConstOp<'tcx> for CellBorrow {
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
         // FIXME: Maybe a more elegant solution to this if else case
         if let hir::ConstContext::Static(_) = ccx.const_kind() {
-            ccx.tcx.sess.create_err(InteriorMutableDataRefer {
+            ccx.tcx.sess.create_err(errors::InteriorMutableDataRefer {
                 span,
                 opt_help: Some(()),
                 kind: ccx.const_kind(),
                 teach: ccx.tcx.sess.teach(&error_code!(E0492)).then_some(()),
             })
         } else {
-            ccx.tcx.sess.create_err(InteriorMutableDataRefer {
+            ccx.tcx.sess.create_err(errors::InteriorMutableDataRefer {
                 span,
                 opt_help: None,
                 kind: ccx.const_kind(),
@@ -528,12 +525,12 @@ impl<'tcx> NonConstOp<'tcx> for MutBorrow {
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
         match self.0 {
-            hir::BorrowKind::Raw => ccx.tcx.sess.create_err(UnallowedMutableRefsRaw {
+            hir::BorrowKind::Raw => ccx.tcx.sess.create_err(errors::UnallowedMutableRefsRaw {
                 span,
                 kind: ccx.const_kind(),
                 teach: ccx.tcx.sess.teach(&error_code!(E0764)).then_some(()),
             }),
-            hir::BorrowKind::Ref => ccx.tcx.sess.create_err(UnallowedMutableRefs {
+            hir::BorrowKind::Ref => ccx.tcx.sess.create_err(errors::UnallowedMutableRefs {
                 span,
                 kind: ccx.const_kind(),
                 teach: ccx.tcx.sess.teach(&error_code!(E0764)).then_some(()),
@@ -557,14 +554,14 @@ impl<'tcx> NonConstOp<'tcx> for TransientMutBorrow {
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
         let kind = ccx.const_kind();
         match self.0 {
-            hir::BorrowKind::Raw => ccx
-                .tcx
-                .sess
-                .create_feature_err(TransientMutBorrowErrRaw { span, kind }, sym::const_mut_refs),
-            hir::BorrowKind::Ref => ccx
-                .tcx
-                .sess
-                .create_feature_err(TransientMutBorrowErr { span, kind }, sym::const_mut_refs),
+            hir::BorrowKind::Raw => ccx.tcx.sess.create_feature_err(
+                errors::TransientMutBorrowErrRaw { span, kind },
+                sym::const_mut_refs,
+            ),
+            hir::BorrowKind::Ref => ccx.tcx.sess.create_feature_err(
+                errors::TransientMutBorrowErr { span, kind },
+                sym::const_mut_refs,
+            ),
         }
     }
 }
@@ -586,9 +583,10 @@ impl<'tcx> NonConstOp<'tcx> for MutDeref {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx
-            .sess
-            .create_feature_err(MutDerefErr { span, kind: ccx.const_kind() }, sym::const_mut_refs)
+        ccx.tcx.sess.create_feature_err(
+            errors::MutDerefErr { span, kind: ccx.const_kind() },
+            sym::const_mut_refs,
+        )
     }
 }
 
@@ -601,7 +599,7 @@ impl<'tcx> NonConstOp<'tcx> for PanicNonStr {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(PanicNonStrErr { span })
+        ccx.tcx.sess.create_err(errors::PanicNonStrErr { span })
     }
 }
 
@@ -652,7 +650,7 @@ impl<'tcx> NonConstOp<'tcx> for RawPtrToIntCast {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(RawPtrToIntErr { span })
+        ccx.tcx.sess.create_err(errors::RawPtrToIntErr { span })
     }
 }
 
@@ -673,7 +671,7 @@ impl<'tcx> NonConstOp<'tcx> for StaticAccess {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(StaticAccessErr {
+        ccx.tcx.sess.create_err(errors::StaticAccessErr {
             span,
             kind: ccx.const_kind(),
             teach: ccx.tcx.sess.teach(&error_code!(E0013)).then_some(()),
@@ -690,7 +688,7 @@ impl<'tcx> NonConstOp<'tcx> for ThreadLocalAccess {
         ccx: &ConstCx<'_, 'tcx>,
         span: Span,
     ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
-        ccx.tcx.sess.create_err(NonConstOpErr { span })
+        ccx.tcx.sess.create_err(errors::NonConstOpErr { span })
     }
 }
 

compiler/rustc_expand/src/base.rs

@@ -1,11 +1,6 @@
 #![deny(rustc::untranslatable_diagnostic)]
 
-use crate::errors::{
-    ArgumentNotAttributes, AttrNoArguments, AttributeMetaItem, AttributeSingleWord,
-    AttributesWrongForm, CannotBeNameOfMacro, ExpectedCommaInList, HelperAttributeNameInvalid,
-    MacroBodyStability, MacroConstStability, NotAMetaItem, OnlyOneArgument, OnlyOneWord,
-    ResolveRelativePath, TakesNoArguments, TraceMacro,
-};
+use crate::errors;
 use crate::expand::{self, AstFragment, Invocation};
 use crate::module::DirOwnership;
 
@@ -796,13 +791,13 @@ impl SyntaxExtension {
             .unwrap_or_else(|| (None, helper_attrs));
         let (stability, const_stability, body_stability) = attr::find_stability(&sess, attrs, span);
         if let Some((_, sp)) = const_stability {
-            sess.emit_err(MacroConstStability {
+            sess.emit_err(errors::MacroConstStability {
                 span: sp,
                 head_span: sess.source_map().guess_head_span(span),
             });
         }
         if let Some((_, sp)) = body_stability {
-            sess.emit_err(MacroBodyStability {
+            sess.emit_err(errors::MacroBodyStability {
                 span: sp,
                 head_span: sess.source_map().guess_head_span(span),
             });
@@ -1143,7 +1138,7 @@ impl<'a> ExtCtxt<'a> {
     }
     pub fn trace_macros_diag(&mut self) {
         for (span, notes) in self.expansions.iter() {
-            let mut db = self.sess.parse_sess.create_note(TraceMacro { span: *span });
+            let mut db = self.sess.parse_sess.create_note(errors::TraceMacro { span: *span });
             for note in notes {
                 db.note(note);
             }
@@ -1197,7 +1192,7 @@ pub fn resolve_path(
                 .expect("attempting to resolve a file path in an external file"),
             FileName::DocTest(path, _) => path,
             other => {
-                return Err(ResolveRelativePath {
+                return Err(errors::ResolveRelativePath {
                     span,
                     path: parse_sess.source_map().filename_for_diagnostics(&other).to_string(),
                 }
@@ -1279,7 +1274,7 @@ pub fn expr_to_string(
 /// done as rarely as possible).
 pub fn check_zero_tts(cx: &ExtCtxt<'_>, span: Span, tts: TokenStream, name: &str) {
     if !tts.is_empty() {
-        cx.emit_err(TakesNoArguments { span, name });
+        cx.emit_err(errors::TakesNoArguments { span, name });
     }
 }
 
@@ -1307,14 +1302,14 @@ pub fn get_single_str_from_tts(
 ) -> Option<Symbol> {
     let mut p = cx.new_parser_from_tts(tts);
     if p.token == token::Eof {
-        cx.emit_err(OnlyOneArgument { span, name });
+        cx.emit_err(errors::OnlyOneArgument { span, name });
         return None;
     }
     let ret = parse_expr(&mut p)?;
     let _ = p.eat(&token::Comma);
 
     if p.token != token::Eof {
-        cx.emit_err(OnlyOneArgument { span, name });
+        cx.emit_err(errors::OnlyOneArgument { span, name });
     }
     expr_to_string(cx, ret, "argument must be a string literal").map(|(s, _)| s)
 }
@@ -1336,7 +1331,7 @@ pub fn get_exprs_from_tts(cx: &mut ExtCtxt<'_>, tts: TokenStream) -> Option<Vec<
             continue;
         }
         if p.token != token::Eof {
-            cx.emit_err(ExpectedCommaInList { span: p.token.span });
+            cx.emit_err(errors::ExpectedCommaInList { span: p.token.span });
             return None;
         }
     }
@@ -1353,51 +1348,58 @@ pub fn parse_macro_name_and_helper_attrs(
     // `#[proc_macro_derive(Foo, attributes(A, ..))]`
     let list = attr.meta_item_list()?;
     if list.len() != 1 && list.len() != 2 {
-        diag.emit_err(AttrNoArguments { span: attr.span });
+        diag.emit_err(errors::AttrNoArguments { span: attr.span });
         return None;
     }
     let Some(trait_attr) = list[0].meta_item() else {
-        diag.emit_err(NotAMetaItem {span: list[0].span()});
+        diag.emit_err(errors::NotAMetaItem {span: list[0].span()});
         return None;
     };
     let trait_ident = match trait_attr.ident() {
         Some(trait_ident) if trait_attr.is_word() => trait_ident,
         _ => {
-            diag.emit_err(OnlyOneWord { span: trait_attr.span });
+            diag.emit_err(errors::OnlyOneWord { span: trait_attr.span });
             return None;
         }
     };
 
     if !trait_ident.name.can_be_raw() {
-        diag.emit_err(CannotBeNameOfMacro { span: trait_attr.span, trait_ident, macro_type });
+        diag.emit_err(errors::CannotBeNameOfMacro {
+            span: trait_attr.span,
+            trait_ident,
+            macro_type,
+        });
     }
 
     let attributes_attr = list.get(1);
     let proc_attrs: Vec<_> = if let Some(attr) = attributes_attr {
         if !attr.has_name(sym::attributes) {
-            diag.emit_err(ArgumentNotAttributes { span: attr.span() });
+            diag.emit_err(errors::ArgumentNotAttributes { span: attr.span() });
         }
         attr.meta_item_list()
             .unwrap_or_else(|| {
-                diag.emit_err(AttributesWrongForm { span: attr.span() });
+                diag.emit_err(errors::AttributesWrongForm { span: attr.span() });
                 &[]
             })
             .iter()
             .filter_map(|attr| {
                 let Some(attr) = attr.meta_item() else {
-                    diag.emit_err(AttributeMetaItem { span: attr.span() });
+                    diag.emit_err(errors::AttributeMetaItem { span: attr.span() });
                     return None;
                 };
 
                 let ident = match attr.ident() {
                     Some(ident) if attr.is_word() => ident,
                     _ => {
-                        diag.emit_err(AttributeSingleWord { span: attr.span });
+                        diag.emit_err(errors::AttributeSingleWord { span: attr.span });
                         return None;
                     }
                 };
                 if !ident.name.can_be_raw() {
-                    diag.emit_err(HelperAttributeNameInvalid { span: attr.span, name: ident });
+                    diag.emit_err(errors::HelperAttributeNameInvalid {
+                        span: attr.span,
+                        name: ident,
+                    });
                 }
 
                 Some(ident.name)