Store return types of variable initializers in summaries.

pkg/analyzer/lib/src/summary/idl.dart

Index: pkg/analyzer/lib/src/summary/idl.dart
diff --git a/pkg/analyzer/lib/src/summary/idl.dart b/pkg/analyzer/lib/src/summary/idl.dart
index 1bd59d13d5cb396cffff689a92bbcb01b6665268..44e9456d08567fdee20695a797e82e51aa5c099e 100644
--- a/pkg/analyzer/lib/src/summary/idl.dart
+++ b/pkg/analyzer/lib/src/summary/idl.dart
@@ -1175,7 +1175,10 @@ abstract class UnlinkedExecutable extends base.SummaryClass {
 
   /**
    * Declared return type of the executable.  Absent if the executable is a
-   * constructor or the return type is implicit.
+   * constructor or the return type is implicit.  Absent for executables
+   * associated with variable initializers and closures, since these
+   * executables may have return types that are not accessible via direct
+   * imports.
    */
   @Id(3)
   EntityRef get returnType;
@@ -1579,6 +1582,7 @@ abstract class UnlinkedReference extends base.SummaryClass {
   /**
    * Name of the entity being referred to.  For the pseudo-type `dynamic`, the
    * string is "dynamic".  For the pseudo-type `void`, the string is "void".
+   * For the pseudo-type `bottom`, the string is "*bottom*".
    */
   @Id(0)
   String get name;