Rollup merge of #129344 - compiler-errors:less-option-unit-diagnostics, r=jieyouxu

Use `bool` in favor of `Option<()>` for diagnostics

We originally only supported `Option<()>` for optional notes/labels, but we now support `bool`. Let's use that, since it usually leads to more readable code.

I'm not removing the support from the derive macro, though I guess we could error on it... 🤔

Author: matthiaskrgr

compiler/rustc_ast_lowering/src/asm.rs

@@ -86,9 +86,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                                 // Multiple different abi names may actually be the same ABI
                                 // If the specified ABIs are not the same name, alert the user that they resolve to the same ABI
                                 let source_map = self.tcx.sess.source_map();
-                                let equivalent = (source_map.span_to_snippet(*prev_sp)
-                                    != source_map.span_to_snippet(*abi_span))
-                                .then_some(());
+                                let equivalent = source_map.span_to_snippet(*prev_sp)
+                                    != source_map.span_to_snippet(*abi_span);
 
                                 self.dcx().emit_err(AbiSpecifiedMultipleTimes {
                                     abi_span: *abi_span,

compiler/rustc_ast_lowering/src/errors.rs

@@ -184,7 +184,7 @@ pub struct AbiSpecifiedMultipleTimes {
     #[label]
     pub prev_span: Span,
     #[note]
-    pub equivalent: Option<()>,
+    pub equivalent: bool,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -963,14 +963,13 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 self_ty,
                 items,
             }) => {
-                let error =
-                    |annotation_span, annotation, only_trait: bool| errors::InherentImplCannot {
-                        span: self_ty.span,
-                        annotation_span,
-                        annotation,
-                        self_ty: self_ty.span,
-                        only_trait: only_trait.then_some(()),
-                    };
+                let error = |annotation_span, annotation, only_trait| errors::InherentImplCannot {
+                    span: self_ty.span,
+                    annotation_span,
+                    annotation,
+                    self_ty: self_ty.span,
+                    only_trait,
+                };
 
                 self.with_in_trait_impl(None, |this| {
                     this.visibility_not_permitted(
@@ -1195,7 +1194,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
                 } else if where_clauses.after.has_where_token {
                     self.dcx().emit_err(errors::WhereClauseAfterTypeAlias {
                         span: where_clauses.after.span,
-                        help: self.session.is_nightly_build().then_some(()),
+                        help: self.session.is_nightly_build(),
                     });
                 }
             }

compiler/rustc_ast_passes/src/errors.rs

@@ -484,7 +484,7 @@ pub struct InherentImplCannot<'a> {
     #[label(ast_passes_type)]
     pub self_ty: Span,
     #[note(ast_passes_only_trait)]
-    pub only_trait: Option<()>,
+    pub only_trait: bool,
 }
 
 #[derive(Diagnostic)]
@@ -528,7 +528,7 @@ pub struct WhereClauseAfterTypeAlias {
     #[primary_span]
     pub span: Span,
     #[help]
-    pub help: Option<()>,
+    pub help: bool,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_attr/src/builtin.rs

@@ -846,7 +846,7 @@ pub fn find_deprecation(
                                     sess.dcx().emit_err(
                                         session_diagnostics::DeprecatedItemSuggestion {
                                             span: mi.span,
-                                            is_nightly: sess.is_nightly_build().then_some(()),
+                                            is_nightly: sess.is_nightly_build(),
                                             details: (),
                                         },
                                     );

compiler/rustc_attr/src/session_diagnostics.rs

@@ -342,7 +342,7 @@ pub(crate) struct DeprecatedItemSuggestion {
     pub span: Span,
 
     #[help]
-    pub is_nightly: Option<()>,
+    pub is_nightly: bool,
 
     #[note]
     pub details: (),

compiler/rustc_const_eval/src/check_consts/ops.rs

@@ -384,7 +384,7 @@ impl<'tcx> NonConstOp<'tcx> for HeapAllocation {
         ccx.dcx().create_err(errors::UnallowedHeapAllocations {
             span,
             kind: ccx.const_kind(),
-            teach: ccx.tcx.sess.teach(E0010).then_some(()),
+            teach: ccx.tcx.sess.teach(E0010),
         })
     }
 }
@@ -444,16 +444,16 @@ impl<'tcx> NonConstOp<'tcx> for CellBorrow {
         if let hir::ConstContext::Static(_) = ccx.const_kind() {
             ccx.dcx().create_err(errors::InteriorMutableDataRefer {
                 span,
-                opt_help: Some(()),
+                opt_help: true,
                 kind: ccx.const_kind(),
-                teach: ccx.tcx.sess.teach(E0492).then_some(()),
+                teach: ccx.tcx.sess.teach(E0492),
             })
         } else {
             ccx.dcx().create_err(errors::InteriorMutableDataRefer {
                 span,
-                opt_help: None,
+                opt_help: false,
                 kind: ccx.const_kind(),
-                teach: ccx.tcx.sess.teach(E0492).then_some(()),
+                teach: ccx.tcx.sess.teach(E0492),
             })
         }
     }
@@ -481,12 +481,12 @@ impl<'tcx> NonConstOp<'tcx> for MutBorrow {
             hir::BorrowKind::Raw => ccx.tcx.dcx().create_err(errors::UnallowedMutableRaw {
                 span,
                 kind: ccx.const_kind(),
-                teach: ccx.tcx.sess.teach(E0764).then_some(()),
+                teach: ccx.tcx.sess.teach(E0764),
             }),
             hir::BorrowKind::Ref => ccx.dcx().create_err(errors::UnallowedMutableRefs {
                 span,
                 kind: ccx.const_kind(),
-                teach: ccx.tcx.sess.teach(E0764).then_some(()),
+                teach: ccx.tcx.sess.teach(E0764),
             }),
         }
     }

compiler/rustc_const_eval/src/errors.rs

@@ -151,7 +151,7 @@ pub(crate) struct UnallowedMutableRefs {
     pub span: Span,
     pub kind: ConstContext,
     #[note(const_eval_teach_note)]
-    pub teach: Option<()>,
+    pub teach: bool,
 }
 
 #[derive(Diagnostic)]
@@ -161,7 +161,7 @@ pub(crate) struct UnallowedMutableRaw {
     pub span: Span,
     pub kind: ConstContext,
     #[note(const_eval_teach_note)]
-    pub teach: Option<()>,
+    pub teach: bool,
 }
 #[derive(Diagnostic)]
 #[diag(const_eval_non_const_fmt_macro_call, code = E0015)]
@@ -196,7 +196,7 @@ pub(crate) struct UnallowedHeapAllocations {
     pub span: Span,
     pub kind: ConstContext,
     #[note(const_eval_teach_note)]
-    pub teach: Option<()>,
+    pub teach: bool,
 }
 
 #[derive(Diagnostic)]
@@ -214,10 +214,10 @@ pub(crate) struct InteriorMutableDataRefer {
     #[label]
     pub span: Span,
     #[help]
-    pub opt_help: Option<()>,
+    pub opt_help: bool,
     pub kind: ConstContext,
     #[note(const_eval_teach_note)]
-    pub teach: Option<()>,
+    pub teach: bool,
 }
 
 #[derive(Diagnostic)]

compiler/rustc_expand/src/errors.rs

@@ -281,7 +281,7 @@ pub(crate) struct IncompleteParse<'a> {
     pub macro_path: &'a ast::Path,
     pub kind_name: &'a str,
     #[note(expand_macro_expands_to_match_arm)]
-    pub expands_to_match_arm: Option<()>,
+    pub expands_to_match_arm: bool,
 
     #[suggestion(
         expand_suggestion_add_semi,

compiler/rustc_expand/src/expand.rs

@@ -1031,7 +1031,7 @@ pub(crate) fn ensure_complete_parse<'a>(
             label_span: span,
             macro_path,
             kind_name,
-            expands_to_match_arm: expands_to_match_arm.then_some(()),
+            expands_to_match_arm,
             add_semicolon,
         });
     }