Suppress suggestions in derive macro

compiler/rustc_errors/src/diagnostic.rs

@@ -519,6 +519,18 @@ impl Diagnostic {
 
     /// Helper for pushing to `self.suggestions`, if available (not disable).
     fn push_suggestion(&mut self, suggestion: CodeSuggestion) {
+        let in_derive = suggestion.substitutions.iter().any(|subst| {
+            subst.parts.iter().any(|part| {
+                let span = part.span;
+                let call_site = span.ctxt().outer_expn_data().call_site;
+                span.in_derive_expansion() && span.overlaps_or_adjacent(call_site)
+            })
+        });
+        if in_derive {
+            // Ignore if spans is from derive macro.
+            return;
+        }
+
         if let Ok(suggestions) = &mut self.suggestions {
             suggestions.push(suggestion);
         }

compiler/rustc_span/src/lib.rs

@@ -627,6 +627,13 @@ impl Span {
         span.lo < other.hi && other.lo < span.hi
     }
 
+    /// Returns `true` if `self` touches or adjoins `other`.
+    pub fn overlaps_or_adjacent(self, other: Span) -> bool {
+        let span = self.data();
+        let other = other.data();
+        span.lo <= other.hi && other.lo <= span.hi
+    }
+
     /// Returns `true` if the spans are equal with regards to the source text.
     ///
     /// Use this instead of `==` when either span could be generated code,