Remove unused import and make Makefile more flexible

dart/site/try/poi/Makefile

 # Copyright (c) 2014, 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.
 
 # This Makefile is used to run the analyzer on the sources of poi.dart.
 # Unfortunately, we have to ignore some hints either due to bugs in the
 # analyzer, or due to patterns in dart2js (for example, unused imports of
 # helpers.dart).
 #
 # The purpose of this Makefile is to be used from inside Emacs to fix any valid
 # warning or hints reported. The whitelist is maintained as needed by those who
 # use this Makefile.
 
 SDK_DIR=../../../xcodebuild/ReleaseIA32/dart-sdk
 PACKAGE_ROOT=../../../xcodebuild/ReleaseIA32/packages/
 
 all:
         @echo $(SDK_DIR)/bin/dartanalyzer -p $(PACKAGE_ROOT) repeat_poi.dart
         @$(SDK_DIR)/bin/dartanalyzer -p $(PACKAGE_ROOT) \
         --package-warnings --machine ../poi/repeat_poi.dart 2>&1 \
         | grep -v DEPRECATED_MEMBER_USE \
         | grep -v DEAD_CODE \
-        | grep -v 'INFO|HINT|ARGUMENT_TYPE_NOT_ASSIGNABLE|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/cps_ir/optimizers\.dart|7|8|27|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/dart2jslib\.dart|26|8|22|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/dart_types\.dart|17|8|22|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/deferred_load\.dart|59|8|11|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/elements/elements\.dart|28|8|25|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/elements/modelx\.dart|8|8|25|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/js_emitter/js_emitter\.dart|47|8|25|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/library_loader\.dart|25|8|22|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/patch_parser\.dart|120|8|22|' \
-        | grep -v 'INFO|HINT|UNUSED_IMPORT|.*/compiler/implementation/resolution/class_members\.dart|22|8|25|' \
+        | grep -v -E 'INFO\|HINT\|ARGUMENT_TYPE_NOT_ASSIGNABLE\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/cps_ir/optimizers\.dart\|7\|8\|27\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/dart2jslib\.dart\|26\|8\|22\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/dart_types\.dart\|17\|8\|22\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/elements/elements\.dart\|[0-9]+\|8\|25\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/elements/modelx\.dart\|[0-9]+\|8\|25\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/js_emitter/js_emitter\.dart\|[0-9]+\|8\|25\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/library_loader\.dart\|25\|8\|22\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/patch_parser\.dart\|120\|8\|22\|' \
+        | grep -v -E 'INFO\|HINT\|UNUSED_IMPORT\|.*/compiler/implementation/resolution/class_members\.dart\|22\|8\|25\|' \
         | sed -e "s,$(PWD)/,," \
         | awk -F'|' '{print $$4 ":" $$5 ":" $$6 ":\n [" n$$3 "]" $$8 }' \