Made assert a keyword.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index 4f4f5ddba2aba43b2f61400ae36a5585d69f63d0..9d3e6cdbf0dbfbbf9ec038d5b6934353a0f4ca3e 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -1053,6 +1053,8 @@ class Parser {
       return parseBreakStatement(token);
     } else if (value === 'continue') {
       return parseContinueStatement(token);
+    } else if (value === 'assert') {
+      return parseAssertStatement(token);
     } else if (value === ';') {
       return parseEmptyStatement(token);
     } else if (value === 'const') {
@@ -2047,6 +2049,14 @@ class Parser {
     return expectSemicolon(token);
   }
 
+  Token parseAssertStatement(Token token) {
+    Token assertKeyword = token;
+    token = expect('assert', token);
+    token = parseParenthesizedExpression(token);

[ahe, 2012/10/10 08:44:13]

Rather than parsing a parenthesized expression here, I would prefer to use
parseArguments. This makes the Send node look like it always did. We can report
an error in the resolver if the number of arguments is incorrect.

[aam-me, 2012/10/11 05:35:25]

Done.

+    listener.handleAssertStatement(assertKeyword, token);
+    return expectSemicolon(token);
+  }
+
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);