Address some comments

compiler/rustc_infer/src/errors/mod.rs

@@ -1,6 +1,6 @@
 use hir::GenericParamKind;
 use rustc_errors::{
-    fluent, AddSubdiagnostic, Applicability, DiagnosticMessage, DiagnosticStyledString,
+    fluent, AddSubdiagnostic, Applicability, DiagnosticMessage, DiagnosticStyledString, MultiSpan,
 };
 use rustc_hir as hir;
 use rustc_hir::{FnRetTy, Ty};
@@ -273,8 +273,8 @@ pub enum LifetimeMismatchLabels {
         ty_sup: Span,
         ty_sub: Span,
         span: Span,
-        label_var1: Option<Ident>,
-        label_var2: Option<Ident>,
+        sup: Option<Ident>,
+        sub: Option<Ident>,
     },
 }
 
@@ -293,8 +293,8 @@ impl AddSubdiagnostic for LifetimeMismatchLabels {
                 ty_sup,
                 ty_sub,
                 span,
-                label_var1,
-                label_var2,
+                sup: label_var1,
+                sub: label_var2,
             } => {
                 if hir_equal {
                     diag.span_label(ty_sup, fluent::infer::declared_multiple);
@@ -422,22 +422,16 @@ pub struct LifetimeMismatch<'a> {
     pub suggestion: AddLifetimeParamsSuggestion<'a>,
 }
 
-pub mod mismatched_static_lifetime {
-    use rustc_errors::{self, fluent, AddSubdiagnostic, MultiSpan};
-    use rustc_span::Span;
-
-    use super::note_and_explain;
-
-    pub struct LabeledMultiSpan {
-        pub multi_span: MultiSpan,
+pub struct IntroducesStaticBecauseUnmetLifetimeReq {
+    pub unmet_requirements: MultiSpan,
     pub binding_span: Span,
 }
 
-    impl AddSubdiagnostic for LabeledMultiSpan {
+impl AddSubdiagnostic for IntroducesStaticBecauseUnmetLifetimeReq {
     fn add_to_diagnostic(mut self, diag: &mut rustc_errors::Diagnostic) {
-            self.multi_span
+        self.unmet_requirements
             .push_span_label(self.binding_span, fluent::infer::msl_introduces_static);
-            diag.span_note(self.multi_span, fluent::infer::msl_unmet_req);
+        diag.span_note(self.unmet_requirements, fluent::infer::msl_unmet_req);
     }
 }
 
@@ -461,11 +455,7 @@ pub mod mismatched_static_lifetime {
         #[primary_span]
         span: Span,
     },
-        #[suggestion_verbose(
-            infer::msl_trait_sugg,
-            code = " + '_",
-            applicability = "maybe-incorrect"
-        )]
+    #[suggestion_verbose(infer::msl_trait_sugg, code = " + '_", applicability = "maybe-incorrect")]
     Sugg {
         #[primary_span]
         span: Span,
@@ -478,7 +468,7 @@ pub mod mismatched_static_lifetime {
     #[primary_span]
     pub cause_span: Span,
     #[subdiagnostic]
-        pub multispan_subdiag: LabeledMultiSpan,
+    pub unmet_lifetime_reqs: IntroducesStaticBecauseUnmetLifetimeReq,
     #[subdiagnostic]
     pub expl: Option<note_and_explain::RegionExplanation<'a>>,
     #[subdiagnostic]
@@ -486,4 +476,3 @@ pub mod mismatched_static_lifetime {
     #[subdiagnostic]
     pub trait_subdiags: Vec<TraitSubdiag>,
 }
-}

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/different_lifetimes.rs

@@ -122,8 +122,8 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
                 ty_sup: ty_sup.span,
                 ty_sub: ty_sub.span,
                 span,
-                label_var1: anon_param_sup.pat.simple_ident(),
-                label_var2: anon_param_sub.pat.simple_ident(),
+                sup: anon_param_sup.pat.simple_ident(),
+                sub: anon_param_sub.pat.simple_ident(),
             },
         };
 

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/mismatched_static_lifetime.rs

@@ -1,8 +1,8 @@
 //! Error Reporting for when the lifetime for a type doesn't match the `impl` selected for a predicate
 //! to hold.
 
-use crate::errors::mismatched_static_lifetime::{ImplNote, MismatchedStaticLifetime, TraitSubdiag};
-use crate::errors::{mismatched_static_lifetime::LabeledMultiSpan, note_and_explain};
+use crate::errors::{note_and_explain, IntroducesStaticBecauseUnmetLifetimeReq};
+use crate::errors::{ImplNote, MismatchedStaticLifetime, TraitSubdiag};
 use crate::infer::error_reporting::nice_region_error::NiceRegionError;
 use crate::infer::lexical_region_resolve::RegionResolutionError;
 use crate::infer::{SubregionOrigin, TypeTrace};
@@ -43,7 +43,10 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
 
         // FIXME: we should point at the lifetime
         let multi_span: MultiSpan = vec![binding_span].into();
-        let multispan_subdiag = LabeledMultiSpan { multi_span, binding_span };
+        let multispan_subdiag = IntroducesStaticBecauseUnmetLifetimeReq {
+            unmet_requirements: multi_span,
+            binding_span,
+        };
 
         let expl = note_and_explain::RegionExplanation::new(
             self.tcx(),
@@ -100,7 +103,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
         }
         let err = MismatchedStaticLifetime {
             cause_span: cause.span,
-            multispan_subdiag,
+            unmet_lifetime_reqs: multispan_subdiag,
             expl,
             impl_note: ImplNote { impl_span },
             trait_subdiags,

compiler/rustc_infer/src/lib.rs

@@ -36,9 +36,5 @@ extern crate tracing;
 extern crate rustc_middle;
 
 mod errors;
-pub mod public_errors {
-    // Probably would be useful in rustc_borrowck
-    pub use super::errors::AddLifetimeParamsSuggestion;
-}
 pub mod infer;
 pub mod traits;