Auto merge of #153365 - JonathanBrouwer:rollup-68ZtmT3, r=JonathanBrouwer

Rollup of 5 pull requests

Successful merges:

 - #153280 (Add regression test for `doc(fake_variadic)` on reexports)
 - #153358 (Boundary tests for various Duration-float operations)
 - #153272 (Add `Path::absolute` method as alias for `std::path::absolute`)
 - #153295 (update panicking() docs for panic=abort)
 - #153352 (Migration of `LintDiagnostic` - part 6)

Author: bors

compiler/rustc_ast_passes/src/errors.rs

@@ -4,7 +4,7 @@ use rustc_abi::ExternAbi;
 use rustc_ast::ParamKindOrd;
 use rustc_errors::codes::*;
 use rustc_errors::{Applicability, Diag, EmissionGuarantee, Subdiagnostic};
-use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
+use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{Ident, Span, Symbol};
 
 #[derive(Diagnostic)]
@@ -671,7 +671,7 @@ pub(crate) struct MissingUnsafeOnExtern {
     pub span: Span,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("extern blocks should be unsafe")]
 pub(crate) struct MissingUnsafeOnExternLint {
     #[suggestion(
@@ -1027,7 +1027,7 @@ pub(crate) struct MissingAbi {
     pub span: Span,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("`extern` declarations without an explicit ABI are deprecated")]
 pub(crate) struct MissingAbiSugg {
     #[suggestion(

compiler/rustc_builtin_macros/src/errors.rs

@@ -3,26 +3,26 @@ use rustc_errors::{
     Diag, DiagCtxtHandle, Diagnostic, EmissionGuarantee, Level, MultiSpan, SingleLabelManySpans,
     Subdiagnostic, msg,
 };
-use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
+use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{Ident, Span, Symbol};
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("avoid using `.intel_syntax`, Intel syntax is the default")]
 pub(crate) struct AvoidIntelSyntax;
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("avoid using `.att_syntax`, prefer using `options(att_syntax)` instead")]
 pub(crate) struct AvoidAttSyntax;
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("include macro expected single expression in source")]
 pub(crate) struct IncompleteInclude;
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("cannot test inner items")]
 pub(crate) struct UnnameableTestItems;
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("duplicated attribute")]
 pub(crate) struct DuplicateMacroAttribute;
 

compiler/rustc_errors/src/decorate_diag.rs

@@ -1,15 +1,16 @@
 /// This module provides types and traits for buffering lints until later in compilation.
 use rustc_ast::node_id::NodeId;
 use rustc_data_structures::fx::FxIndexMap;
+use rustc_data_structures::sync::DynSend;
 use rustc_error_messages::MultiSpan;
 use rustc_lint_defs::{BuiltinLintDiag, Lint, LintId};
 
-use crate::{DynSend, LintDiagnostic, LintDiagnosticBox};
+use crate::{Diag, DiagCtxtHandle, Diagnostic, Level};
 
 /// We can't implement `LintDiagnostic` for `BuiltinLintDiag`, because decorating some of its
 /// variants requires types we don't have yet. So, handle that case separately.
 pub enum DecorateDiagCompat {
-    Dynamic(Box<dyn for<'a> LintDiagnosticBox<'a, ()> + DynSend + 'static>),
+    Dynamic(Box<dyn for<'a> FnOnce(DiagCtxtHandle<'a>, Level) -> Diag<'a, ()> + DynSend + 'static>),
     Builtin(BuiltinLintDiag),
 }
 
@@ -19,12 +20,10 @@ impl std::fmt::Debug for DecorateDiagCompat {
     }
 }
 
-impl !LintDiagnostic<'_, ()> for BuiltinLintDiag {}
-
-impl<D: for<'a> LintDiagnostic<'a, ()> + DynSend + 'static> From<D> for DecorateDiagCompat {
+impl<D: for<'a> Diagnostic<'a, ()> + DynSend + 'static> From<D> for DecorateDiagCompat {
     #[inline]
     fn from(d: D) -> Self {
-        Self::Dynamic(Box::new(d))
+        Self::Dynamic(Box::new(|dcx, level| d.into_diag(dcx, level)))
     }
 }
 

compiler/rustc_errors/src/diagnostic.rs

@@ -7,6 +7,7 @@ use std::panic;
 use std::path::PathBuf;
 use std::thread::panicking;
 
+use rustc_data_structures::sync::DynSend;
 use rustc_error_messages::{DiagArgMap, DiagArgName, DiagArgValue, IntoDiagArg};
 use rustc_lint_defs::{Applicability, LintExpectationId};
 use rustc_macros::{Decodable, Encodable};
@@ -118,6 +119,14 @@ where
     }
 }
 
+impl<'a> Diagnostic<'a, ()>
+    for Box<dyn for<'b> FnOnce(DiagCtxtHandle<'b>, Level) -> Diag<'b, ()> + DynSend + 'static>
+{
+    fn into_diag(self, dcx: DiagCtxtHandle<'a>, level: Level) -> Diag<'a, ()> {
+        self(dcx, level)
+    }
+}
+
 /// Trait implemented by error types. This should not be implemented manually. Instead, use
 /// `#[derive(Subdiagnostic)]` -- see [rustc_macros::Subdiagnostic].
 #[rustc_diagnostic_item = "Subdiagnostic"]
@@ -137,16 +146,6 @@ pub trait LintDiagnostic<'a, G: EmissionGuarantee> {
     fn decorate_lint<'b>(self, diag: &'b mut Diag<'a, G>);
 }
 
-pub trait LintDiagnosticBox<'a, G: EmissionGuarantee> {
-    fn decorate_lint_box<'b>(self: Box<Self>, diag: &'b mut Diag<'a, G>);
-}
-
-impl<'a, G: EmissionGuarantee, D: LintDiagnostic<'a, G>> LintDiagnosticBox<'a, G> for D {
-    fn decorate_lint_box<'b>(self: Box<Self>, diag: &'b mut Diag<'a, G>) {
-        self.decorate_lint(diag);
-    }
-}
-
 #[derive(Clone, Debug, Encodable, Decodable)]
 pub(crate) struct DiagLocation {
     file: Cow<'static, str>,

compiler/rustc_errors/src/lib.rs

@@ -40,7 +40,7 @@ pub use codes::*;
 pub use decorate_diag::{BufferedEarlyLint, DecorateDiagCompat, LintBuffer};
 pub use diagnostic::{
     BugAbort, Diag, DiagInner, DiagStyledString, Diagnostic, EmissionGuarantee, FatalAbort,
-    LintDiagnostic, LintDiagnosticBox, StringPart, Subdiag, Subdiagnostic,
+    LintDiagnostic, StringPart, Subdiag, Subdiagnostic,
 };
 pub use diagnostic_impls::{
     DiagSymbolList, ElidedLifetimeInPathSubdiag, ExpectedLifetimeParameter,

compiler/rustc_expand/src/errors.rs

@@ -3,10 +3,10 @@ use std::borrow::Cow;
 use rustc_ast::ast;
 use rustc_errors::codes::*;
 use rustc_hir::limit::Limit;
-use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
+use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_span::{Ident, MacroRulesNormalizedIdent, Span, Symbol};
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("`#[cfg_attr]` does not expand to any attributes")]
 pub(crate) struct CfgAttrNoAttributes;
 
@@ -94,15 +94,15 @@ pub(crate) struct MacroVarStillRepeating {
     pub ident: MacroRulesNormalizedIdent,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("variable `{$ident}` is still repeating at this depth")]
 pub(crate) struct MetaVarStillRepeatingLint {
     #[label("expected repetition")]
     pub label: Span,
     pub ident: MacroRulesNormalizedIdent,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("meta-variable repeats with different Kleene operator")]
 pub(crate) struct MetaVariableWrongOperator {
     #[label("expected repetition")]
@@ -119,7 +119,7 @@ pub(crate) struct MetaVarsDifSeqMatchers {
     pub msg: String,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("unknown macro variable `{$name}`")]
 pub(crate) struct UnknownMacroVariable {
     pub name: MacroRulesNormalizedIdent,
@@ -391,7 +391,7 @@ pub(crate) struct DuplicateMatcherBinding {
     pub prev: Span,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("duplicate matcher binding")]
 pub(crate) struct DuplicateMatcherBindingLint {
     #[label("duplicate binding")]
@@ -569,7 +569,7 @@ pub(crate) struct MacroArgsBadDelimSugg {
     pub close: Span,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("unused doc comment")]
 #[help(
     "to document an item produced by a macro, the macro must produce the documentation as part of its expansion"
@@ -579,7 +579,7 @@ pub(crate) struct MacroCallUnusedDocComment {
     pub span: Span,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag(
     "the meaning of the `pat` fragment specifier is changing in Rust 2021, which may affect this macro"
 )]
@@ -593,7 +593,7 @@ pub(crate) struct OrPatternsBackCompat {
     pub suggestion: String,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("trailing semicolon in macro used in expression position")]
 pub(crate) struct TrailingMacro {
     #[note("macro invocations at the end of a block are treated as expressions")]
@@ -604,7 +604,7 @@ pub(crate) struct TrailingMacro {
     pub name: Ident,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("unused attribute `{$attr_name}`")]
 pub(crate) struct UnusedBuiltinAttribute {
     #[note(

compiler/rustc_lint/src/early.rs

@@ -50,8 +50,7 @@ impl<'ecx, 'tcx, T: EarlyLintPass> EarlyContextAndPass<'ecx, 'tcx, T> {
                     );
                 }
                 DecorateDiagCompat::Dynamic(d) => {
-                    self.context
-                        .opt_span_lint(lint_id.lint, span, |diag| d.decorate_lint_box(diag));
+                    self.context.opt_span_diag_lint(lint_id.lint, span, d);
                 }
             }
         }

compiler/rustc_parse/src/errors.rs

@@ -11,7 +11,7 @@ use rustc_errors::{
     Applicability, Diag, DiagArgValue, DiagCtxtHandle, Diagnostic, EmissionGuarantee, IntoDiagArg,
     Level, Subdiagnostic, SuggestionStyle, msg,
 };
-use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
+use rustc_macros::{Diagnostic, Subdiagnostic};
 use rustc_session::errors::ExprParenthesesNeeded;
 use rustc_span::edition::{Edition, LATEST_STABLE_EDITION};
 use rustc_span::{Ident, Span, Symbol};
@@ -4305,7 +4305,7 @@ pub(crate) struct ExpectedRegisterClassOrExplicitRegister {
     pub(crate) span: Span,
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("unicode codepoint changing visible direction of text present in {$label}")]
 #[note(
     "these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen"
@@ -4388,7 +4388,7 @@ impl Subdiagnostic for HiddenUnicodeCodepointsDiagSub {
     }
 }
 
-#[derive(LintDiagnostic)]
+#[derive(Diagnostic)]
 #[diag("missing pattern for `...` argument")]
 pub(crate) struct VarargsWithoutPattern {
     #[suggestion(

compiler/rustc_resolve/src/diagnostics.rs

@@ -136,7 +136,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         }
 
         for ambiguity_error in &self.ambiguity_errors {
-            let diag = self.ambiguity_diagnostic(ambiguity_error);
+            let mut diag = self.ambiguity_diagnostic(ambiguity_error);
 
             if let Some(ambiguity_warning) = ambiguity_error.warning {
                 let node_id = match ambiguity_error.b1.0.kind {
@@ -152,6 +152,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
 
                 self.lint_buffer.buffer_lint(lint, node_id, diag.ident.span, diag);
             } else {
+                diag.is_error = true;
                 self.dcx().emit_err(diag);
             }
         }
@@ -2093,6 +2094,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
             b1_help_msgs,
             b2_note,
             b2_help_msgs,
+            is_error: false,
         }
     }