errors: `span_suggestion` takes `impl ToString`

Change `span_suggestion` (and variants) to take `impl ToString` rather
than `String` for the suggested code, as this simplifies the
requirements on the diagnostic derive.

Signed-off-by: David Wood <david.wood@huawei.com>

2 files changed, 12 insertions, 12 deletions

diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs
index cd17726c785..39cb71848eb 100644
--- a/compiler/rustc_errors/src/diagnostic.rs
+++ b/compiler/rustc_errors/src/diagnostic.rs
@@ -605,7 +605,7 @@ impl Diagnostic {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self {
         self.span_suggestion_with_style(
@@ -623,13 +623,13 @@ impl Diagnostic {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
         style: SuggestionStyle,
     ) -> &mut Self {
         self.push_suggestion(CodeSuggestion {
             substitutions: vec![Substitution {
-                parts: vec![SubstitutionPart { snippet: suggestion, span: sp }],
+                parts: vec![SubstitutionPart { snippet: suggestion.to_string(), span: sp }],
             }],
             msg: msg.into(),
             style,
@@ -643,7 +643,7 @@ impl Diagnostic {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self {
         self.span_suggestion_with_style(
@@ -711,7 +711,7 @@ impl Diagnostic {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self {
         self.span_suggestion_with_style(
@@ -734,7 +734,7 @@ impl Diagnostic {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self {
         self.span_suggestion_with_style(
@@ -755,7 +755,7 @@ impl Diagnostic {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self {
         self.span_suggestion_with_style(
diff --git a/compiler/rustc_errors/src/diagnostic_builder.rs b/compiler/rustc_errors/src/diagnostic_builder.rs
index d2180408477..efc7693459f 100644
--- a/compiler/rustc_errors/src/diagnostic_builder.rs
+++ b/compiler/rustc_errors/src/diagnostic_builder.rs
@@ -477,7 +477,7 @@ impl<'a, G: EmissionGuarantee> DiagnosticBuilder<'a, G> {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self);
     forward!(pub fn span_suggestions(
@@ -497,28 +497,28 @@ impl<'a, G: EmissionGuarantee> DiagnosticBuilder<'a, G> {
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self);
     forward!(pub fn span_suggestion_verbose(
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self);
     forward!(pub fn span_suggestion_hidden(
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self);
     forward!(pub fn tool_only_span_suggestion(
         &mut self,
         sp: Span,
         msg: impl Into<DiagnosticMessage>,
-        suggestion: String,
+        suggestion: impl ToString,
         applicability: Applicability,
     ) -> &mut Self);