Add approximate suggestions for rustfix

This adds `span_approximate_suggestion()` that lets you emit a
suggestion marked as "approximate" in the JSON output. UI
users see no difference. This is for when rustc and clippy wish to
 emit suggestions which will make sense to the reader (e.g. they may
have placeholders like `<type>`) but are not source-applicable, so that
rustfix/etc can ignore these.

fixes #39254

src/librustc_errors/diagnostic.rs

@@ -222,6 +222,7 @@ impl Diagnostic {
             }],
             msg: msg.to_owned(),
             show_code_when_inline: false,
+            approximate: false,
         });
         self
     }
@@ -252,6 +253,7 @@ impl Diagnostic {
             }],
             msg: msg.to_owned(),
             show_code_when_inline: true,
+            approximate: false,
         });
         self
     }
@@ -267,6 +269,41 @@ impl Diagnostic {
             }).collect(),
             msg: msg.to_owned(),
             show_code_when_inline: true,
+            approximate: false,
+        });
+        self
+    }
+
+    /// This is a suggestion that may contain mistakes or fillers and should
+    /// be read and understood by a human.
+    pub fn span_approximate_suggestion(&mut self, sp: Span, msg: &str,
+                                       suggestion: String) -> &mut Self {
+        self.suggestions.push(CodeSuggestion {
+            substitutions: vec![Substitution {
+                parts: vec![SubstitutionPart {
+                    snippet: suggestion,
+                    span: sp,
+                }],
+            }],
+            msg: msg.to_owned(),
+            show_code_when_inline: true,
+            approximate: true,
+        });
+        self
+    }
+
+    pub fn span_approximate_suggestions(&mut self, sp: Span, msg: &str,
+                                        suggestions: Vec<String>) -> &mut Self {
+        self.suggestions.push(CodeSuggestion {
+            substitutions: suggestions.into_iter().map(|snippet| Substitution {
+                parts: vec![SubstitutionPart {
+                    snippet,
+                    span: sp,
+                }],
+            }).collect(),
+            msg: msg.to_owned(),
+            show_code_when_inline: true,
+            approximate: true,
         });
         self
     }

src/librustc_errors/diagnostic_builder.rs

@@ -186,6 +186,16 @@ impl<'a> DiagnosticBuilder<'a> {
                                      msg: &str,
                                      suggestions: Vec<String>)
                                      -> &mut Self);
+    forward!(pub fn span_approximate_suggestion(&mut self,
+                                                sp: Span,
+                                                msg: &str,
+                                                suggestion: String)
+                                                -> &mut Self);
+    forward!(pub fn span_approximate_suggestions(&mut self,
+                                                 sp: Span,
+                                                 msg: &str,
+                                                 suggestions: Vec<String>)
+                                                 -> &mut Self);
     forward!(pub fn set_span<S: Into<MultiSpan>>(&mut self, sp: S) -> &mut Self);
     forward!(pub fn code(&mut self, s: DiagnosticId) -> &mut Self);
 

src/librustc_errors/lib.rs

@@ -83,6 +83,12 @@ pub struct CodeSuggestion {
     pub substitutions: Vec<Substitution>,
     pub msg: String,
     pub show_code_when_inline: bool,
+    /// Whether or not the suggestion is approximate
+    ///
+    /// Sometimes we may show suggestions with placeholders,
+    /// which are useful for users but not useful for
+    /// tools like rustfix
+    pub approximate: bool,
 }
 
 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]