Fix "if" conditions in summary Builder setters.

pkg/analyzer/tool/summary/generate.dart

Index: pkg/analyzer/tool/summary/generate.dart
diff --git a/pkg/analyzer/tool/summary/generate.dart b/pkg/analyzer/tool/summary/generate.dart
index 03593db7554fe86032e9483ea3b51e0df9709caf..51d499447b389862a45dd95ab969487cbf1706f8 100644
--- a/pkg/analyzer/tool/summary/generate.dart
+++ b/pkg/analyzer/tool/summary/generate.dart
@@ -332,7 +332,7 @@ class _CodeGenerator {
           indent(() {
             out('assert(!_finished);');
             out('assert(!_json.containsKey(${quoted(fieldName)}));');
-            out('if (_value != null$condition) {');
+            out('if (!(_value == null$condition)) {');

[Brian Wilkerson, 2015/12/18 18:16:10]

The case where there is no default value got uglier. What would you think of

if (condition.isEmpty) {
  out('if (_value != null) {');
} else {
  out('if (!(_value == null$condition)) {');
}

             indent(() {
               out('_json[${quoted(fieldName)}] = $conversion;');
             });