Auto merge of #82935 - henryboisdequin:diagnostic-cleanups, r=estebank

Diagnostic cleanups

Follow up to #81503
Helps with #82916 (don't show note if `span` is `DUMMY_SP`)

2 files changed, 9 insertions, 8 deletions

diff --git a/compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs b/compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs
index 24b9408ffb6..eb942b195b2 100644
--- a/compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs
+++ b/compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs
@@ -13,7 +13,7 @@ use rustc_middle::mir::{
 use rustc_middle::ty::{self, suggest_constraining_type_param, Ty, TypeFoldable};
 use rustc_span::source_map::DesugaringKind;
 use rustc_span::symbol::sym;
-use rustc_span::Span;
+use rustc_span::{Span, DUMMY_SP};
 
 use crate::dataflow::drop_flag_effects;
 use crate::dataflow::indexes::{MoveOutIndex, MovePathIndex};
@@ -216,12 +216,13 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                                 );
                             }
                             // Avoid pointing to the same function in multiple different
-                            // error messages
-                            if self.fn_self_span_reported.insert(self_arg.span) {
+                            // error messages.
+                            if span != DUMMY_SP && self.fn_self_span_reported.insert(self_arg.span)
+                            {
                                 err.span_note(
-                                    self_arg.span,
-                                    &format!("this function takes ownership of the receiver `self`, which moves {}", place_name)
-                                );
+                                        self_arg.span,
+                                        &format!("this function takes ownership of the receiver `self`, which moves {}", place_name)
+                                    );
                             }
                         }
                         // Deref::deref takes &self, which cannot cause a move
diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
index 5c97791530d..c1b105f1d84 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
@@ -1908,7 +1908,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
 
                 if is_const_fn {
                     err.help(
-                        "consider creating a new `const` item and initializing with the result \
+                        "consider creating a new `const` item and initializing it with the result \
                         of the function call to be used in the repeat position, like \
                         `const VAL: Type = const_fn();` and `let x = [VAL; 42];`",
                     );
@@ -1916,7 +1916,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
 
                 if self.tcx.sess.is_nightly_build() && is_const_fn {
                     err.help(
-                        "create an inline `const` block, see PR \
+                        "create an inline `const` block, see RFC \
                         #2920 <https://github.com/rust-lang/rfcs/pull/2920> \
                         for more information",
                     );