Remove dart backend

test/dart_codegen/expect/core/exceptions.dart

-part of dart.core;
- abstract class Exception {factory Exception([var message]) => new _ExceptionImplementation(message);
-}
- class _ExceptionImplementation implements Exception {final message;
- _ExceptionImplementation([this.message]);
- String toString() {
-if (message == null) return "Exception";
- return "Exception: $message";
-}
-}
- class FormatException implements Exception {final String message;
- final source;
- final int offset;
- const FormatException([this.message = "", this.source, this.offset = -1]);
- String toString() {
-String report = "FormatException";
- if (message != null && "" != message) {
-report = "$report: $message";
-}
- int offset = this.offset;
- if (source is! String) {
-if (offset != -1) {
-  report += " (at offset $offset)";
-  }
- return report;
-}
- if (offset != -1 && (offset < 0 || offset > DEVC$RT.cast(source.length, dynamic, num, "DynamicCast", """line 108, column 49 of dart:core/exceptions.dart: """, source.length is num, true))) {
-offset = -1;
-}
- if (offset == -1) {
-String source = ((__x3) => DEVC$RT.cast(__x3, dynamic, String, "DynamicCast", """line 113, column 23 of dart:core/exceptions.dart: """, __x3 is String, true))(this.source);
- if (source.length > 78) {
-  source = source.substring(0, 75) + "...";
-  }
- return "$report\n$source";
-}
- int lineNum = 1;
- int lineStart = 0;
- bool lastWasCR;
- for (int i = 0; i < offset; i++) {
-int char = ((__x4) => DEVC$RT.cast(__x4, dynamic, int, "DynamicCast", """line 123, column 18 of dart:core/exceptions.dart: """, __x4 is int, true))(source.codeUnitAt(i));
- if (char == 0x0a) {
-  if (lineStart != i || !lastWasCR) {
-    lineNum++;
-    }
-   lineStart = i + 1;
-   lastWasCR = false;
-  }
- else if (char == 0x0d) {
-  lineNum++;
-   lineStart = i + 1;
-   lastWasCR = true;
-  }
-}
- if (lineNum > 1) {
-report += " (at line $lineNum, character ${offset - lineStart + 1})\n";
-}
- else {
-report += " (at character ${offset + 1})\n";
-}
- int lineEnd = DEVC$RT.cast(source.length, dynamic, int, "DynamicCast", """line 141, column 19 of dart:core/exceptions.dart: """, source.length is int, true);
- for (int i = offset; i < DEVC$RT.cast(source.length, dynamic, num, "DynamicCast", """line 142, column 30 of dart:core/exceptions.dart: """, source.length is num, true); i++) {
-int char = ((__x5) => DEVC$RT.cast(__x5, dynamic, int, "DynamicCast", """line 143, column 18 of dart:core/exceptions.dart: """, __x5 is int, true))(source.codeUnitAt(i));
- if (char == 0x0a || char == 0x0d) {
-  lineEnd = i;
-   break;
-  }
-}
- int length = lineEnd - lineStart;
- int start = lineStart;
- int end = lineEnd;
- String prefix = "";
- String postfix = "";
- if (length > 78) {
-int index = offset - lineStart;
- if (index < 75) {
-  end = start + 75;
-   postfix = "...";
-  }
- else if (end - offset < 75) {
-  start = end - 75;
-   prefix = "...";
-  }
- else {
-  start = offset - 36;
-   end = offset + 36;
-   prefix = postfix = "...";
-  }
-}
- String slice = ((__x6) => DEVC$RT.cast(__x6, dynamic, String, "DynamicCast", """line 171, column 20 of dart:core/exceptions.dart: """, __x6 is String, true))(source.substring(start, end));
- int markOffset = offset - start + prefix.length;
- return "$report$prefix$slice$postfix\n${" " * markOffset}^\n";
-}
-}
- class IntegerDivisionByZeroException implements Exception {const IntegerDivisionByZeroException();
- String toString() => "IntegerDivisionByZeroException";
-}