Implement initializer asserts.

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

Index: pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
index 6e7254cab57be5cb02e35f5b716f3d7e17706211..dc961963bcca49c99bb04a233920691ad619c72a 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
@@ -43,6 +43,21 @@ FastaMessage _formatStackOverflow(Uri uri, int charOffset) {
       message: "Stack overflow.", arguments: {});
 }
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const FastaCode<_AssertExtraneousArgument> codeAssertExtraneousArgument =
+    const FastaCode<_AssertExtraneousArgument>("AssertExtraneousArgument",
+        template: r"`assert` can't have more than two arguments.",
+        dart2jsCode: "FASTA_FATAL",
+        format: _formatAssertExtraneousArgument);
+
+typedef FastaMessage _AssertExtraneousArgument(Uri uri, int charOffset);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+FastaMessage _formatAssertExtraneousArgument(Uri uri, int charOffset) {
+  return new FastaMessage(uri, charOffset, codeAssertExtraneousArgument,
+      message: "`assert` can't have more than two arguments.", arguments: {});
+}
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const FastaCode<_UnexpectedToken> codeUnexpectedToken =
     const FastaCode<_UnexpectedToken>("UnexpectedToken",
@@ -758,6 +773,21 @@ FastaMessage _formatYieldAsIdentifier(Uri uri, int charOffset) {
       arguments: {});
 }
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const FastaCode<_AssertAsExpression> codeAssertAsExpression =
+    const FastaCode<_AssertAsExpression>("AssertAsExpression",
+        template: r"`assert` can't be used as an expression.",
+        dart2jsCode: "FASTA_FATAL",
+        format: _formatAssertAsExpression);
+
+typedef FastaMessage _AssertAsExpression(Uri uri, int charOffset);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+FastaMessage _formatAssertAsExpression(Uri uri, int charOffset) {
+  return new FastaMessage(uri, charOffset, codeAssertAsExpression,
+      message: "`assert` can't be used as an expression.", arguments: {});
+}
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const FastaCode<_OnlyTry> codeOnlyTry = const FastaCode<_OnlyTry>("OnlyTry",
     template: