show list of candidates

Author: ABouttefeux

compiler/rustc_typeck/src/check/method/suggest.rs

@@ -517,21 +517,29 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             if inherent_impls_candidate.len() > 0 {
                                 inherent_impls_candidate.sort();
                                 inherent_impls_candidate.dedup();
+
+                                // number of type to shows at most.
+                                let limit = if inherent_impls_candidate.len() == 5 { 5 } else { 4 };
                                 let type_candidates = inherent_impls_candidate
                                     .iter()
-                                    .map(|impl_item| self.tcx.at(span).type_of(*impl_item))
-                                    .collect::<Vec<_>>();
-                                // number of type to shows at most.
-                                let limit = if type_candidates.len() == 4 { 4 } else { 3 };
-                                for ty in type_candidates.iter().take(limit) {
-                                    err.note(&format!("the {item_kind} was found for {}", ty));
-                                }
-                                if type_candidates.len() > limit {
-                                    err.note(&format!(
-                                        "the {item_kind} was found for {} more types",
-                                        type_candidates.len() - limit
-                                    ));
-                                }
+                                    .take(limit)
+                                    .map(|impl_item| {
+                                        format!("- `{}`", self.tcx.at(span).type_of(*impl_item))
+                                    })
+                                    .collect::<Vec<_>>()
+                                    .join("\n");
+                                let additional_types = if inherent_impls_candidate.len() > limit {
+                                    format!(
+                                        "\nand {} more types",
+                                        inherent_impls_candidate.len() - limit
+                                    )
+                                } else {
+                                    "".to_string()
+                                };
+                                err.note(&format!(
+                                    "the {item_kind} was found for\n{}{}",
+                                    type_candidates, additional_types
+                                ));
                             }
                         }
                     } else {

src/test/ui/issues/issue-30123.stderr

@@ -4,7 +4,8 @@ error[E0599]: no function or associated item named `new_undirected` found for st
 LL |     let ug = Graph::<i32, i32>::new_undirected();
    |                                 ^^^^^^^^^^^^^^ function or associated item not found in `issue_30123_aux::Graph<i32, i32>`
    |
-   = note: the function or associated item was found for issue_30123_aux::Graph<N, E, Undirected>
+   = note: the function or associated item was found for
+           - `issue_30123_aux::Graph<N, E, Undirected>`
 
 error: aborting due to previous error
 

src/test/ui/methods/method-not-found-generic-arg-elision.stderr

@@ -7,7 +7,8 @@ LL | struct Point<T> {
 LL |     let d = point_i32.distance();
    |                       ^^^^^^^^ method not found in `Point<i32>`
    |
-   = note: the method was found for Point<f64>
+   = note: the method was found for
+           - `Point<f64>`
 
 error[E0599]: no method named `other` found for struct `Point` in the current scope
   --> $DIR/method-not-found-generic-arg-elision.rs:84:23
@@ -33,10 +34,12 @@ LL | struct Wrapper<T>(T);
 LL |     wrapper.method();
    |             ^^^^^^ method not found in `Wrapper<bool>`
    |
-   = note: the method was found for Wrapper<i8>
-   = note: the method was found for Wrapper<i16>
-   = note: the method was found for Wrapper<i32>
-   = note: the method was found for 3 more types
+   = note: the method was found for
+           - `Wrapper<i8>`
+           - `Wrapper<i16>`
+           - `Wrapper<i32>`
+           - `Wrapper<i64>`
+           and 2 more types
 
 error[E0599]: no method named `other` found for struct `Wrapper` in the current scope
   --> $DIR/method-not-found-generic-arg-elision.rs:92:13
@@ -56,9 +59,10 @@ LL | struct Wrapper2<'a, T, const C: usize> {
 LL |     wrapper.method();
    |             ^^^^^^ method not found in `Wrapper2<'_, bool, 3_usize>`
    |
-   = note: the method was found for Wrapper2<'a, i8, C>
-   = note: the method was found for Wrapper2<'a, i16, C>
-   = note: the method was found for Wrapper2<'a, i32, C>
+   = note: the method was found for
+           - `Wrapper2<'a, i8, C>`
+           - `Wrapper2<'a, i16, C>`
+           - `Wrapper2<'a, i32, C>`
 
 error[E0599]: no method named `other` found for struct `Wrapper2` in the current scope
   --> $DIR/method-not-found-generic-arg-elision.rs:98:13