Rollup merge of #100351 - compiler-errors:diagnostic-convention, r=fee1-dead

Use `&mut Diagnostic` instead of `&mut DiagnosticBuilder` unless needed

This seems to be the established convention (02ff9e0) when `DiagnosticBuilder` was first added. I am guilty of introducing some of these.

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -13,9 +13,7 @@ use rustc_ast::walk_list;
 use rustc_ast::*;
 use rustc_ast_pretty::pprust::{self, State};
 use rustc_data_structures::fx::FxHashMap;
-use rustc_errors::{
-    error_code, pluralize, struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed,
-};
+use rustc_errors::{error_code, pluralize, struct_span_err, Applicability, Diagnostic};
 use rustc_parse::validate_attr;
 use rustc_session::lint::builtin::{
     DEPRECATED_WHERE_CLAUSE_LOCATION, MISSING_ABI, PATTERNS_IN_FNS_WITHOUT_BODY,
@@ -477,7 +475,7 @@ impl<'a> AstValidator<'a> {
         ctx: &str,
         msg: &str,
         sugg: &str,
-        help: impl FnOnce(&mut DiagnosticBuilder<'_, ErrorGuaranteed>),
+        help: impl FnOnce(&mut Diagnostic),
     ) {
         let source_map = self.session.source_map();
         let end = source_map.end_point(sp);
@@ -1196,7 +1194,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                     let msg = "free function without a body";
                     let ext = sig.header.ext;
 
-                    let f = |e: &mut DiagnosticBuilder<'_, _>| {
+                    let f = |e: &mut Diagnostic| {
                         if let Extern::Implicit(start_span) | Extern::Explicit(_, start_span) = &ext
                         {
                             let start_suggestion = if let Extern::Explicit(abi, _) = ext {

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -451,7 +451,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
     fn suggest_borrow_fn_like(
         &self,
-        err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+        err: &mut Diagnostic,
         ty: Ty<'tcx>,
         move_sites: &[MoveSite],
         value_name: &str,
@@ -526,12 +526,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         true
     }
 
-    fn suggest_adding_copy_bounds(
-        &self,
-        err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
-        ty: Ty<'tcx>,
-        span: Span,
-    ) {
+    fn suggest_adding_copy_bounds(&self, err: &mut Diagnostic, ty: Ty<'tcx>, span: Span) {
         let tcx = self.infcx.tcx;
         let generics = tcx.generics_of(self.mir_def_id());
 

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -783,7 +783,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
 
     fn maybe_suggest_constrain_dyn_trait_impl(
         &self,
-        diag: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+        diag: &mut Diagnostic,
         f: Region<'tcx>,
         o: Region<'tcx>,
         category: &ConstraintCategory<'tcx>,

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -14,7 +14,7 @@ use rustc_ast::{NodeId, DUMMY_NODE_ID};
 use rustc_ast_pretty::pprust;
 use rustc_attr::{self as attr, TransparencyError};
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
-use rustc_errors::{Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{Applicability, Diagnostic, DiagnosticBuilder};
 use rustc_feature::Features;
 use rustc_lint_defs::builtin::{
     RUST_2021_INCOMPATIBLE_OR_PATTERNS, SEMICOLON_IN_EXPRESSIONS_FROM_MACROS,
@@ -608,11 +608,7 @@ enum ExplainDocComment {
     },
 }
 
-fn annotate_doc_comment(
-    err: &mut DiagnosticBuilder<'_, ErrorGuaranteed>,
-    sm: &SourceMap,
-    span: Span,
-) {
+fn annotate_doc_comment(err: &mut Diagnostic, sm: &SourceMap, span: Span) {
     if let Ok(src) = sm.span_to_snippet(span) {
         if src.starts_with("///") || src.starts_with("/**") {
             err.subdiagnostic(ExplainDocComment::Outer { span });

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -19,7 +19,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{
     fluent, Applicability, DiagnosticBuilder, DiagnosticMessage, Handler, MultiSpan, PResult,
 };
-use rustc_errors::{pluralize, struct_span_err, Diagnostic, EmissionGuarantee, ErrorGuaranteed};
+use rustc_errors::{pluralize, struct_span_err, Diagnostic, ErrorGuaranteed};
 use rustc_macros::{SessionDiagnostic, SessionSubdiagnostic};
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, Ident};
@@ -228,13 +228,13 @@ struct MultiSugg {
 }
 
 impl MultiSugg {
-    fn emit<G: EmissionGuarantee>(self, err: &mut DiagnosticBuilder<'_, G>) {
+    fn emit(self, err: &mut Diagnostic) {
         err.multipart_suggestion(&self.msg, self.patches, self.applicability);
     }
 
     /// Overrides individual messages and applicabilities.
-    fn emit_many<G: EmissionGuarantee>(
-        err: &mut DiagnosticBuilder<'_, G>,
+    fn emit_many(
+        err: &mut Diagnostic,
         msg: &str,
         applicability: Applicability,
         suggestions: impl Iterator<Item = Self>,

compiler/rustc_parse/src/parser/expr.rs

@@ -859,7 +859,7 @@ impl<'a> Parser<'a> {
             );
             let mut err = self.struct_span_err(span, &msg);
 
-            let suggest_parens = |err: &mut DiagnosticBuilder<'_, _>| {
+            let suggest_parens = |err: &mut Diagnostic| {
                 let suggestions = vec![
                     (span.shrink_to_lo(), "(".to_string()),
                     (span.shrink_to_hi(), ")".to_string()),

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -2021,9 +2021,9 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
 
     fn suggest_introducing_lifetime(
         &self,
-        err: &mut DiagnosticBuilder<'_, ErrorGuaranteed>,
+        err: &mut Diagnostic,
         name: Option<&str>,
-        suggest: impl Fn(&mut DiagnosticBuilder<'_, ErrorGuaranteed>, bool, Span, &str, String) -> bool,
+        suggest: impl Fn(&mut Diagnostic, bool, Span, &str, String) -> bool,
     ) {
         let mut suggest_note = true;
         for rib in self.lifetime_ribs.iter().rev() {
@@ -2149,7 +2149,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
 
     pub(crate) fn add_missing_lifetime_specifiers_label(
         &mut self,
-        err: &mut DiagnosticBuilder<'_, ErrorGuaranteed>,
+        err: &mut Diagnostic,
         lifetime_refs: Vec<MissingLifetime>,
         function_param_lifetimes: Option<(Vec<MissingLifetime>, Vec<ElisionFnParameter>)>,
     ) {

compiler/rustc_typeck/src/astconv/mod.rs

@@ -16,7 +16,8 @@ use crate::require_c_abi_if_c_variadic;
 use rustc_ast::TraitObjectSyntax;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{
-    struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed, FatalError, MultiSpan,
+    struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed, FatalError,
+    MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Namespace, Res};
@@ -2106,7 +2107,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
     pub fn prohibit_generics<'a>(
         &self,
         segments: impl Iterator<Item = &'a hir::PathSegment<'a>> + Clone,
-        extend: impl Fn(&mut DiagnosticBuilder<'tcx, ErrorGuaranteed>),
+        extend: impl Fn(&mut Diagnostic),
     ) -> bool {
         let args = segments.clone().flat_map(|segment| segment.args().args);
 
@@ -2984,11 +2985,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
     }
 
     /// Make sure that we are in the condition to suggest the blanket implementation.
-    fn maybe_lint_blanket_trait_impl<T: rustc_errors::EmissionGuarantee>(
-        &self,
-        self_ty: &hir::Ty<'_>,
-        diag: &mut DiagnosticBuilder<'_, T>,
-    ) {
+    fn maybe_lint_blanket_trait_impl(&self, self_ty: &hir::Ty<'_>, diag: &mut Diagnostic) {
         let tcx = self.tcx();
         let parent_id = tcx.hir().get_parent_item(self_ty.hir_id);
         if let hir::Node::Item(hir::Item {
@@ -3081,7 +3078,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                             sugg,
                             Applicability::MachineApplicable,
                         );
-                        self.maybe_lint_blanket_trait_impl::<()>(&self_ty, &mut diag);
+                        self.maybe_lint_blanket_trait_impl(&self_ty, &mut diag);
                         diag.emit();
                     },
                 );

compiler/rustc_typeck/src/check/check.rs

@@ -1525,9 +1525,7 @@ fn detect_discriminant_duplicate<'tcx>(
 ) {
     // Helper closure to reduce duplicate code. This gets called everytime we detect a duplicate.
     // Here `idx` refers to the order of which the discriminant appears, and its index in `vs`
-    let report = |dis: Discr<'tcx>,
-                  idx: usize,
-                  err: &mut DiagnosticBuilder<'_, ErrorGuaranteed>| {
+    let report = |dis: Discr<'tcx>, idx: usize, err: &mut Diagnostic| {
         let var = &vs[idx]; // HIR for the duplicate discriminant
         let (span, display_discr) = match var.disr_expr {
             Some(ref expr) => {

compiler/rustc_typeck/src/check/coercion.rs

@@ -1585,9 +1585,9 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
             }
         }
     }
-    fn note_unreachable_loop_return<'a>(
+    fn note_unreachable_loop_return(
         &self,
-        err: &mut DiagnosticBuilder<'a, ErrorGuaranteed>,
+        err: &mut Diagnostic,
         expr: &hir::Expr<'tcx>,
         ret_exprs: &Vec<&'tcx hir::Expr<'tcx>>,
     ) {

compiler/rustc_typeck/src/check/expr.rs

@@ -28,7 +28,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_errors::{
     pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, DiagnosticId,
-    EmissionGuarantee, ErrorGuaranteed,
+    ErrorGuaranteed,
 };
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, DefKind, Res};
@@ -879,7 +879,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         lhs: &'tcx hir::Expr<'tcx>,
         err_code: &'static str,
         op_span: Span,
-        adjust_err: impl FnOnce(&mut DiagnosticBuilder<'tcx, ErrorGuaranteed>),
+        adjust_err: impl FnOnce(&mut Diagnostic),
     ) {
         if lhs.is_syntactic_place_expr() {
             return;
@@ -1089,8 +1089,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         let lhs_ty = self.check_expr_with_needs(&lhs, Needs::MutPlace);
 
-        let suggest_deref_binop = |err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
-                                   rhs_ty: Ty<'tcx>| {
+        let suggest_deref_binop = |err: &mut Diagnostic, rhs_ty: Ty<'tcx>| {
             if let Some(lhs_deref_ty) = self.deref_once_mutably_for_diagnostic(lhs_ty) {
                 // Can only assign if the type is sized, so if `DerefMut` yields a type that is
                 // unsized, do not suggest dereferencing it.
@@ -2205,9 +2204,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.tcx().ty_error()
     }
 
-    fn check_call_constructor<G: EmissionGuarantee>(
+    fn check_call_constructor(
         &self,
-        err: &mut DiagnosticBuilder<'_, G>,
+        err: &mut Diagnostic,
         base: &'tcx hir::Expr<'tcx>,
         def_id: DefId,
     ) {

compiler/rustc_typeck/src/check/fn_ctxt/checks.rs

@@ -1778,7 +1778,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     fn label_fn_like(
         &self,
-        err: &mut rustc_errors::DiagnosticBuilder<'tcx, rustc_errors::ErrorGuaranteed>,
+        err: &mut Diagnostic,
         callable_def_id: Option<DefId>,
         callee_ty: Option<Ty<'tcx>>,
     ) {

compiler/rustc_typeck/src/check/method/suggest.rs

@@ -904,7 +904,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     }
                 }
 
-                let label_span_not_found = |err: &mut DiagnosticBuilder<'_, _>| {
+                let label_span_not_found = |err: &mut Diagnostic| {
                     if unsatisfied_predicates.is_empty() {
                         err.span_label(span, format!("{item_kind} not found in `{ty_str}`"));
                         let is_string_or_ref_str = match actual.kind() {
@@ -1154,7 +1154,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         rcvr_ty: Ty<'tcx>,
         expr: &hir::Expr<'_>,
         item_name: Ident,
-        err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+        err: &mut Diagnostic,
     ) -> bool {
         let tcx = self.tcx;
         let field_receiver = self.autoderef(span, rcvr_ty).find_map(|(ty, _)| match ty.kind() {
@@ -1331,7 +1331,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     fn check_for_field_method(
         &self,
-        err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+        err: &mut Diagnostic,
         source: SelfSource<'tcx>,
         span: Span,
         actual: Ty<'tcx>,
@@ -1380,7 +1380,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     fn check_for_unwrap_self(
         &self,
-        err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
+        err: &mut Diagnostic,
         source: SelfSource<'tcx>,
         span: Span,
         actual: Ty<'tcx>,

compiler/rustc_typeck/src/check/mod.rs

@@ -104,7 +104,7 @@ use crate::astconv::AstConv;
 use crate::check::gather_locals::GatherLocalsVisitor;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{
-    pluralize, struct_span_err, Applicability, DiagnosticBuilder, EmissionGuarantee, MultiSpan,
+    pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::def::Res;
@@ -973,12 +973,7 @@ fn has_expected_num_generic_args<'tcx>(
 /// * `span` - The span of the snippet
 /// * `params` - The number of parameters the constructor accepts
 /// * `err` - A mutable diagnostic builder to add the suggestion to
-fn suggest_call_constructor<G: EmissionGuarantee>(
-    span: Span,
-    kind: CtorOf,
-    params: usize,
-    err: &mut DiagnosticBuilder<'_, G>,
-) {
+fn suggest_call_constructor(span: Span, kind: CtorOf, params: usize, err: &mut Diagnostic) {
     // Note: tuple-structs don't have named fields, so just use placeholders
     let args = vec!["_"; params].join(", ");
     let applicable = if params > 0 {

compiler/rustc_typeck/src/check/op.rs

@@ -59,7 +59,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 {
                     // Suppress this error, since we already emitted
                     // a deref suggestion in check_overloaded_binop
-                    err.delay_as_bug();
+                    err.downgrade_to_delayed_bug();
                 }
             }
         });