Store constant variable initializers in elements.

pkg/compiler/lib/src/elements/elements.dart

Index: pkg/compiler/lib/src/elements/elements.dart
diff --git a/pkg/compiler/lib/src/elements/elements.dart b/pkg/compiler/lib/src/elements/elements.dart
index 54ecf63a80f1e3ce3eb8a71d2d874d210fb67f8c..b0896598d1da7eeb2ff5f62bbf64619d7b372167 100644
--- a/pkg/compiler/lib/src/elements/elements.dart
+++ b/pkg/compiler/lib/src/elements/elements.dart
@@ -996,8 +996,11 @@ abstract class VariableElement extends ExecutableElement {
 
   Expression get initializer;
 
-  /// The constant expression defining the value of the variable if `const`,
-  /// `null` otherwise.
+  /// The constant expression defining the (initial) value of the variable.
+  ///
+  /// If the variable is `const` the value is always non-null, possibly an
+  /// [ErroneousConstantExpression], other otherwise the value is null the

[Siggi Cherem (dart-lang), 2016/04/27 05:52:39]

nit: rephrase (other otherwise => otherwise, null the => null when the?)

[Johnni Winther, 2016/04/28 09:11:01]

Done.

+  /// initializer wasn't a constant expression.
   ConstantExpression get constant;
 }