Generate tear-off closures dynamically.

dart/sdk/lib/_internal/compiler/implementation/scanner/scanner.dart

Index: dart/sdk/lib/_internal/compiler/implementation/scanner/scanner.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/scanner/scanner.dart b/dart/sdk/lib/_internal/compiler/implementation/scanner/scanner.dart
index 8659eadef771a064a9d722556c46d2f6b8b5a5ba..45e2210751d5e4b995e0561c0a19c6d14ee02eeb 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/scanner/scanner.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/scanner/scanner.dart
@@ -376,7 +376,7 @@ abstract class AbstractScanner implements Scanner {
       return $EOF;
     }
     if (next < 0x1f) {
-      return error("unexpected character $next");
+      return error("unexpected character $next", next);
     }
 
     next = currentAsUnicode(next);
@@ -388,7 +388,7 @@ abstract class AbstractScanner implements Scanner {
       return advance();
     }
 
-    return error("unexpected unicode character $next");
+    return error("unexpected unicode character $next", next);
   }
 
   int tokenizeTag(int next) {
@@ -618,7 +618,7 @@ abstract class AbstractScanner implements Scanner {
         hasDigits = true;
       } else {
         if (!hasDigits) {
-          return error("hex digit expected");
+          return error("hex digit expected", next);
         }
         appendSubstringToken(HEXADECIMAL_INFO, start, true);
         return next;
@@ -682,7 +682,7 @@ abstract class AbstractScanner implements Scanner {
         hasDigits = true;
       } else {
         if (!hasDigits) {
-          return error("digit expected");
+          return error("digit expected", next);
         }
         return next;
       }
@@ -818,7 +818,7 @@ abstract class AbstractScanner implements Scanner {
       } else {
         // Identifier ends here.
         if (start == scanOffset) {
-          return error("expected identifier");
+          return error("expected identifier", next);
         } else {
           appendSubstringToken(IDENTIFIER_INFO, start, true);
         }
@@ -882,7 +882,7 @@ abstract class AbstractScanner implements Scanner {
               identical(next, $CR) ||
               identical(next, $EOF))) {
         if (!asciiOnly) handleUnicode(start);
-        return error("unterminated string literal");
+        return error("unterminated string literal", next);
       }
       if (next > 127) asciiOnly = false;
       next = advance();
@@ -937,14 +937,14 @@ abstract class AbstractScanner implements Scanner {
         return next;
       } else if (identical(next, $LF) || identical(next, $CR)) {
         if (!asciiOnly) handleUnicode(start);
-        return error("unterminated string literal");
+        return error("unterminated string literal", next);
       } else if (next > 127) {
         asciiOnly = false;
       }
       next = advance();
     }
     if (!asciiOnly) handleUnicode(start);
-    return error("unterminated string literal");
+    return error("unterminated string literal", next);
   }
 
   int tokenizeMultiLineRawString(int quoteChar, int start) {
@@ -981,7 +981,7 @@ abstract class AbstractScanner implements Scanner {
       }
     }
     if (!asciiOnlyLine) handleUnicode(unicodeStart);
-    return error("unterminated string literal");
+    return error("unterminated string literal", next);
   }
 
   int tokenizeMultiLineString(int quoteChar, int start, bool raw) {
@@ -1032,11 +1032,12 @@ abstract class AbstractScanner implements Scanner {
       next = advance();
     }
     if (!asciiOnlyLine) handleUnicode(unicodeStart);
-    return error("unterminated string literal");
+    return error("unterminated string literal", next);
   }
 
-  int error(String message) {
+  int error(String message, next) {
     appendStringToken(BAD_INPUT_INFO, message);
+    if (next == 0) return 0;
     return advance(); // Ensure progress.
   }