Issue 27536. Quick Fix for 'Avoid using braces in interpolation when not needed'.

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analysis_server.src.services.correction.fix_internal;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core';
 
@@ skipping 347 matching lines @@
     }
     if (errorCode == StaticTypeWarningCode.UNDEFINED_SETTER) {
       _addFix_undefinedClassAccessor_useSimilar();
       _addFix_createField();
     }
     // lints
     if (errorCode is LintCode) {
       if (errorCode.name == LintNames.annotate_overrides) {
         _addLintFixAddOverrideAnnotation();
       }
+      if (errorCode.name == LintNames.unnecessary_brace_in_string_interp) {
+        _addLintRemoveInterpolationBraces();
+      }
     }
     // done
     return fixes;
   }
 
   /**
    * Adds a new [SourceEdit] to [change].
    */
   void _addEdit(Element target, SourceEdit edit) {
     if (target == null) {
@@ skipping 1904 matching lines @@
     if (token is CommentToken) {
       token = (token as CommentToken).parent;
     }
 
     exitPosition = new Position(file, token.offset - 1);
     String indent = utils.getIndent(1);
     _addReplaceEdit(rf.rangeStartLength(token, 0), '@override$eol$indent');
     _addFix(DartFixKind.LINT_ADD_OVERRIDE, []);
   }
 
+  void _addLintRemoveInterpolationBraces() {

[Brian Wilkerson, 2016/10/07 18:57:56]

Remove "Lint" from the name? I don't think it adds anything.

+    AstNode node = this.node;
+    if (node is InterpolationExpression) {
+      Token right = node.rightBracket;
+      if (node.expression != null && right != null) {
+        _addReplaceEdit(rf.rangeStartStart(node, node.expression), r'$');
+        _addRemoveEdit(rf.rangeToken(right));
+        _addFix(DartFixKind.LINT_REMOVE_INTERPOLATION_BRACES, []);
+      }
+    }
+  }
+
   /**
    * Prepares proposal for creating function corresponding to the given
    * [FunctionType].
    */
   void _addProposal_createFunction(
       FunctionType functionType,
       String name,
       Source targetSource,
       int insertOffset,
       bool isStatic,
@@ skipping 596 matching lines @@
     }
     return false;
   }
 }
 
 /**
  * An enumeration of lint names.
  */
 class LintNames {
   static const String annotate_overrides = 'annotate_overrides';
+  static const String unnecessary_brace_in_string_interp =
+      'unnecessary_brace_in_string_interp';
 }
 
 /**
  * Helper for finding [Element] with name closest to the given.
  */
 class _ClosestElementFinder {
   final String _targetName;
   final ElementPredicate _predicate;
 
   Element _element = null;
@@ skipping 10 matching lines @@
       }
     }
   }
 
   void _updateList(Iterable<Element> elements) {
     for (Element element in elements) {
       _update(element);
     }
   }
 }