Don't ovewrite method types of a resynthesized library in TypeResolverVisitor.

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 9941049141386cdbbb4d1b27f14eaed72a4c6838..b589a298377e6aa6733faca0da6910b74cfcff03 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -9761,6 +9761,15 @@ class TypeResolverVisitor extends ScopedVisitor {
       AnalysisEngine.instance.logger.logError(buffer.toString(),
           new CaughtException(new AnalysisException(), null));
     }
+
+    // When the library is resynthesized, types of all of its elements are
+    // already set - statically or inferred. We don't want to overwrite them.
+    // See also dartbug.com/27482 for separating static and inferred types.

[Paul Berry, 2016/11/09 16:47:22]

Do we still need the pointer to bug 27482 now that it's been fixed?

+    if (LibraryElementImpl.hasResolutionCapability(
+        definingLibrary, LibraryResolutionCapability.resolvedTypeNames)) {
+      return null;
+    }
+
     element.declaredReturnType = _computeReturnType(node.returnType);
     element.type = new FunctionTypeImpl(element);
     _inferSetterReturnType(element);
@@ -9777,6 +9786,7 @@ class TypeResolverVisitor extends ScopedVisitor {
         }
       }
     }
+
     return null;
   }