use push(char) instead of push_str(&str) to add single chars to strings

clippy::single-char-push-str

compiler/rustc_save_analysis/src/lib.rs

@@ -438,7 +438,7 @@ impl<'tcx> SaveContext<'tcx> {
                                     .next()
                                     .map(|item| item.def_id);
                             }
-                            qualname.push_str(">");
+                            qualname.push('>');
 
                             (qualname, trait_id, decl_id, docs, attrs)
                         }

compiler/rustc_save_analysis/src/sig.rs

@@ -497,7 +497,7 @@ impl<'hir> Sig for hir::Item<'hir> {
                     sig.text.push_str(&bounds_to_string(bounds));
                 }
                 // FIXME where clause
-                sig.text.push_str(";");
+                sig.text.push(';');
 
                 Ok(sig)
             }