Fix warnings and hints.

pkg/utf/lib/utf32.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-part of dart.utf;
+part of utf;
 
 /**
  * Decodes the UTF-32 bytes as an iterable. Thus, the consumer can only convert
  * as much of the input as needed. Determines the byte order from the BOM,
  * or uses big-endian as a default. This method always strips a leading BOM.
  * Set the replacementCharacter to null to throw an ArgumentError
  * rather than replace the bad value.
  */
 IterableUtf32Decoder decodeUtf32AsIterable(List<int> bytes, [
     int offset = 0, int length,
@@ skipping 47 matching lines @@
 /**
  * Produce a String from a sequence of UTF-32BE encoded bytes. The parameters
  * allow an offset into a list of bytes (as int), limiting the length of the
  * values be decoded and the ability of override the default Unicode
  * replacement character. Set the replacementCharacter to null to throw an
  * ArgumentError rather than replace the bad value.
  */
 String decodeUtf32be(
     List<int> bytes, [int offset = 0, int length, bool stripBom = true,
     int replacementCodepoint = UNICODE_REPLACEMENT_CHARACTER_CODEPOINT]) =>
-  new String.fromCharCodes((new Utf32beBytesDecoder(bytes, offset, length, 
+  new String.fromCharCodes((new Utf32beBytesDecoder(bytes, offset, length,
     stripBom, replacementCodepoint)).decodeRest());
 
 /**
  * Produce a String from a sequence of UTF-32LE encoded bytes. The parameters
  * allow an offset into a list of bytes (as int), limiting the length of the
  * values be decoded and the ability of override the default Unicode
  * replacement character. Set the replacementCharacter to null to throw an
  * ArgumentError rather than replace the bad value.
  */
 String decodeUtf32le(
@@ skipping 245 matching lines @@
     value += (utf32EncodedBytesIterator.current << 24);
     return value;
   }
 }
 
 bool _validCodepoint(int codepoint) {
   return (codepoint >= 0 && codepoint < UNICODE_UTF16_RESERVED_LO) ||
       (codepoint > UNICODE_UTF16_RESERVED_HI &&
       codepoint < UNICODE_VALID_RANGE_MAX);
 }