Require Dart >=2.14 (#351) Also drop use of quiver

diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 4a3b23d..c906867 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml

@@ -47,7 +47,7 @@
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [2.12.0, dev]
+        sdk: [2.14.0, dev]
     steps:
       - uses: actions/checkout@v2
       - uses: dart-lang/setup-dart@v1.0

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c6b7bb..ecca0fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md

@@ -18,6 +18,7 @@
   ignore line annotations.
 * Use the `reportLines` flag in `vm_service`'s `getSourceReport` RPC. This
   typically halves the number of RPCs that the coverage collector needs to run.
+* Require Dart `>=2.14.0`
 
 ## 1.0.3 - 2021-05-25
 

diff --git a/lib/src/chrome.dart b/lib/src/chrome.dart
index ca429ba..770e287 100644
--- a/lib/src/chrome.dart
+++ b/lib/src/chrome.dart

@@ -3,7 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:coverage/src/hitmap.dart';
-import 'package:coverage/src/util.dart';
 import 'package:source_maps/parser.dart';
 
 /// Returns a Dart based hit-map containing coverage report for the provided
@@ -162,7 +161,7 @@
   final int column;
 
   @override
-  int get hashCode => hash2(line, column);
+  int get hashCode => Object.hash(line, column);
 
   @override
   bool operator ==(dynamic o) =>

diff --git a/lib/src/util.dart b/lib/src/util.dart
index 14ba7d5..ff507d1 100644
--- a/lib/src/util.dart
+++ b/lib/src/util.dart

@@ -73,22 +73,6 @@
   }
 }
 
-/// Generates a hash code for two objects.
-int hash2(dynamic a, dynamic b) =>
-    _finish(_combine(_combine(0, a.hashCode), b.hashCode));
-
-int _combine(int hash, int value) {
-  hash = 0x1fffffff & (hash + value);
-  hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
-  return hash ^ (hash >> 6);
-}
-
-int _finish(int hash) {
-  hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
-  hash = hash ^ (hash >> 11);
-  return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
-}
-
 const muliLineIgnoreStart = '// coverage:ignore-start';
 const muliLineIgnoreEnd = '// coverage:ignore-end';
 const singleLineIgnore = '// coverage:ignore-line';

diff --git a/pubspec.yaml b/pubspec.yaml
index 2b89721..effe984 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml

@@ -4,7 +4,7 @@
 homepage: https://github.com/dart-lang/coverage
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.14.0 <3.0.0'
 
 dependencies:
   args: ^2.0.0