Auto merge of #108096 - matthiaskrgr:rollup-ncexzf6, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #107034 (Migrating rustc_infer to session diagnostics (part 4))
 - #107972 (Fix unintentional UB in ui tests)
 - #108010 (Make `InferCtxt::can_eq` and `InferCtxt::can_sub` return booleans)
 - #108021 (make x look for x.py if shell script does not exist)
 - #108047 (Use `target` instead of `machine` for mir interpreter integer handling.)
 - #108049 (Don't suggest `#[doc(hidden)]` trait methods with matching return type)
 - #108066 (Better names for illegal impl trait positions)
 - #108076 (rustdoc: Use more let chain)
 - #108088 (clarify correctness of `black_box`)
 - #108094 (Demonstrate I/O in File examples)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 250 insertions, 7 deletions

diff --git a/compiler/rustc_infer/src/errors/mod.rs b/compiler/rustc_infer/src/errors/mod.rs
index 8bf3a160abb..0c2713fb1a7 100644
--- a/compiler/rustc_infer/src/errors/mod.rs
+++ b/compiler/rustc_infer/src/errors/mod.rs
@@ -933,3 +933,216 @@ pub struct ButNeedsToSatisfy {
     pub has_lifetime: bool,
     pub lifetime: String,
 }
+
+#[derive(Diagnostic)]
+#[diag(infer_outlives_content, code = "E0312")]
+pub struct OutlivesContent<'a> {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub notes: Vec<note_and_explain::RegionExplanation<'a>>,
+}
+
+#[derive(Diagnostic)]
+#[diag(infer_outlives_bound, code = "E0476")]
+pub struct OutlivesBound<'a> {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub notes: Vec<note_and_explain::RegionExplanation<'a>>,
+}
+
+#[derive(Diagnostic)]
+#[diag(infer_fullfill_req_lifetime, code = "E0477")]
+pub struct FullfillReqLifetime<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub ty: Ty<'a>,
+    #[subdiagnostic]
+    pub note: Option<note_and_explain::RegionExplanation<'a>>,
+}
+
+#[derive(Diagnostic)]
+#[diag(infer_lf_bound_not_satisfied, code = "E0478")]
+pub struct LfBoundNotSatisfied<'a> {
+    #[primary_span]
+    pub span: Span,
+    #[subdiagnostic]
+    pub notes: Vec<note_and_explain::RegionExplanation<'a>>,
+}
+
+#[derive(Diagnostic)]
+#[diag(infer_ref_longer_than_data, code = "E0491")]
+pub struct RefLongerThanData<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub ty: Ty<'a>,
+    #[subdiagnostic]
+    pub notes: Vec<note_and_explain::RegionExplanation<'a>>,
+}
+
+#[derive(Subdiagnostic)]
+pub enum WhereClauseSuggestions {
+    #[suggestion(
+        infer_where_remove,
+        code = "",
+        applicability = "machine-applicable",
+        style = "verbose"
+    )]
+    Remove {
+        #[primary_span]
+        span: Span,
+    },
+    #[suggestion(
+        infer_where_copy_predicates,
+        code = "{space}where {trait_predicates}",
+        applicability = "machine-applicable",
+        style = "verbose"
+    )]
+    CopyPredicates {
+        #[primary_span]
+        span: Span,
+        space: &'static str,
+        trait_predicates: String,
+    },
+}
+
+#[derive(Subdiagnostic)]
+pub enum SuggestRemoveSemiOrReturnBinding {
+    #[multipart_suggestion(infer_srs_remove_and_box, applicability = "machine-applicable")]
+    RemoveAndBox {
+        #[suggestion_part(code = "Box::new(")]
+        first_lo: Span,
+        #[suggestion_part(code = ")")]
+        first_hi: Span,
+        #[suggestion_part(code = "Box::new(")]
+        second_lo: Span,
+        #[suggestion_part(code = ")")]
+        second_hi: Span,
+        #[suggestion_part(code = "")]
+        sp: Span,
+    },
+    #[suggestion(
+        infer_srs_remove,
+        style = "short",
+        code = "",
+        applicability = "machine-applicable"
+    )]
+    Remove {
+        #[primary_span]
+        sp: Span,
+    },
+    #[suggestion(
+        infer_srs_add,
+        style = "verbose",
+        code = "{code}",
+        applicability = "maybe-incorrect"
+    )]
+    Add {
+        #[primary_span]
+        sp: Span,
+        code: String,
+        ident: Ident,
+    },
+    #[note(infer_srs_add_one)]
+    AddOne {
+        #[primary_span]
+        spans: MultiSpan,
+    },
+}
+
+#[derive(Subdiagnostic)]
+pub enum ConsiderAddingAwait {
+    #[help(infer_await_both_futures)]
+    BothFuturesHelp,
+    #[multipart_suggestion(infer_await_both_futures, applicability = "maybe-incorrect")]
+    BothFuturesSugg {
+        #[suggestion_part(code = ".await")]
+        first: Span,
+        #[suggestion_part(code = ".await")]
+        second: Span,
+    },
+    #[suggestion(
+        infer_await_future,
+        code = ".await",
+        style = "verbose",
+        applicability = "maybe-incorrect"
+    )]
+    FutureSugg {
+        #[primary_span]
+        span: Span,
+    },
+    #[note(infer_await_note)]
+    FutureSuggNote {
+        #[primary_span]
+        span: Span,
+    },
+    #[multipart_suggestion(
+        infer_await_future,
+        style = "verbose",
+        applicability = "maybe-incorrect"
+    )]
+    FutureSuggMultiple {
+        #[suggestion_part(code = ".await")]
+        spans: Vec<Span>,
+    },
+}
+
+#[derive(Diagnostic)]
+pub enum PlaceholderRelationLfNotSatisfied {
+    #[diag(infer_lf_bound_not_satisfied)]
+    HasBoth {
+        #[primary_span]
+        span: Span,
+        #[note(infer_prlf_defined_with_sub)]
+        sub_span: Span,
+        #[note(infer_prlf_must_oultive_with_sup)]
+        sup_span: Span,
+        sub_symbol: Symbol,
+        sup_symbol: Symbol,
+        #[note(infer_prlf_known_limitation)]
+        note: (),
+    },
+    #[diag(infer_lf_bound_not_satisfied)]
+    HasSub {
+        #[primary_span]
+        span: Span,
+        #[note(infer_prlf_defined_with_sub)]
+        sub_span: Span,
+        #[note(infer_prlf_must_oultive_without_sup)]
+        sup_span: Span,
+        sub_symbol: Symbol,
+        #[note(infer_prlf_known_limitation)]
+        note: (),
+    },
+    #[diag(infer_lf_bound_not_satisfied)]
+    HasSup {
+        #[primary_span]
+        span: Span,
+        #[note(infer_prlf_defined_without_sub)]
+        sub_span: Span,
+        #[note(infer_prlf_must_oultive_with_sup)]
+        sup_span: Span,
+        sup_symbol: Symbol,
+        #[note(infer_prlf_known_limitation)]
+        note: (),
+    },
+    #[diag(infer_lf_bound_not_satisfied)]
+    HasNone {
+        #[primary_span]
+        span: Span,
+        #[note(infer_prlf_defined_without_sub)]
+        sub_span: Span,
+        #[note(infer_prlf_must_oultive_without_sup)]
+        sup_span: Span,
+        #[note(infer_prlf_known_limitation)]
+        note: (),
+    },
+    #[diag(infer_lf_bound_not_satisfied)]
+    OnlyPrimarySpan {
+        #[primary_span]
+        span: Span,
+        #[note(infer_prlf_known_limitation)]
+        note: (),
+    },
+}
diff --git a/compiler/rustc_infer/src/errors/note_and_explain.rs b/compiler/rustc_infer/src/errors/note_and_explain.rs
index 5d861a78af8..cb96aeec5f3 100644
--- a/compiler/rustc_infer/src/errors/note_and_explain.rs
+++ b/compiler/rustc_infer/src/errors/note_and_explain.rs
@@ -121,16 +121,42 @@ impl<'a> DescriptionCtx<'a> {
 
 pub enum PrefixKind {
     Empty,
+    RefValidFor,
+    ContentValidFor,
+    TypeObjValidFor,
+    SourcePointerValidFor,
+    TypeSatisfy,
+    TypeOutlive,
+    LfParamInstantiatedWith,
+    LfParamMustOutlive,
+    LfInstantiatedWith,
+    LfMustOutlive,
+    PointerValidFor,
+    DataValidFor,
 }
 
 pub enum SuffixKind {
+    Empty,
     Continues,
+    ReqByBinding,
 }
 
 impl IntoDiagnosticArg for PrefixKind {
     fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
         let kind = match self {
             Self::Empty => "empty",
+            Self::RefValidFor => "ref_valid_for",
+            Self::ContentValidFor => "content_valid_for",
+            Self::TypeObjValidFor => "type_obj_valid_for",
+            Self::SourcePointerValidFor => "source_pointer_valid_for",
+            Self::TypeSatisfy => "type_satisfy",
+            Self::TypeOutlive => "type_outlive",
+            Self::LfParamInstantiatedWith => "lf_param_instantiated_with",
+            Self::LfParamMustOutlive => "lf_param_must_outlive",
+            Self::LfInstantiatedWith => "lf_instantiated_with",
+            Self::LfMustOutlive => "lf_must_outlive",
+            Self::PointerValidFor => "pointer_valid_for",
+            Self::DataValidFor => "data_valid_for",
         }
         .into();
         rustc_errors::DiagnosticArgValue::Str(kind)
@@ -140,7 +166,9 @@ impl IntoDiagnosticArg for PrefixKind {
 impl IntoDiagnosticArg for SuffixKind {
     fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
         let kind = match self {
+            Self::Empty => "empty",
             Self::Continues => "continues",
+            Self::ReqByBinding => "req_by_binding",
         }
         .into();
         rustc_errors::DiagnosticArgValue::Str(kind)
@@ -166,17 +194,19 @@ impl RegionExplanation<'_> {
 }
 
 impl AddToDiagnostic for RegionExplanation<'_> {
-    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, _: F)
+    fn add_to_diagnostic_with<F>(self, diag: &mut Diagnostic, f: F)
     where
         F: Fn(&mut Diagnostic, SubdiagnosticMessage) -> SubdiagnosticMessage,
     {
-        if let Some(span) = self.desc.span {
-            diag.span_note(span, fluent::infer_region_explanation);
-        } else {
-            diag.note(fluent::infer_region_explanation);
-        }
-        self.desc.add_to(diag);
         diag.set_arg("pref_kind", self.prefix);
         diag.set_arg("suff_kind", self.suffix);
+        let desc_span = self.desc.span;
+        self.desc.add_to(diag);
+        let msg = f(diag, fluent::infer_region_explanation.into());
+        if let Some(span) = desc_span {
+            diag.span_note(span, msg);
+        } else {
+            diag.note(msg);
+        }
     }
 }