Update package:collection for the new strict_top_level_inference li…

…nt (#735)

* Update README.md

* address strict_top_level_inference diagnostics

* deprecate UnmodifiableMapMixin.first and UnmodifiableMapMixin.last

* Update unmodifiable_wrappers.dart

* ignore provide_deprecation_message diagnostics

pkgs/collection/CHANGELOG.md

@@ -4,6 +4,7 @@
   `Map.entries`.
 - Optimize equality and hash code for maps by using `update` and a `values`
   iterator to avoid extra lookups.
+- Address diagnostics from `strict_top_level_inference`.
 
 ## 1.19.1
 

pkgs/collection/README.md

@@ -56,4 +56,4 @@ functions on an existing object.
 
 Please file feature requests and bugs at the [issue tracker][tracker].
 
-[tracker]: https://github.com/dart-lang/collection/issues
+[tracker]: https://github.com/dart-lang/core/issues/new/choose

pkgs/collection/lib/src/unmodifiable_wrappers.dart

@@ -194,11 +194,13 @@ abstract mixin class UnmodifiableMapMixin<K, V> implements Map<K, V> {
   @override
   void clear() => _throw();
 
-  /// Throws an [UnsupportedError];
-  /// operations that change the map are disallowed.
-  set first(_) => _throw();
-
-  /// Throws an [UnsupportedError];
-  /// operations that change the map are disallowed.
-  set last(_) => _throw();
+  /// Throws an [UnsupportedError].
+  // ignore: provide_deprecation_message
+  @deprecated
+  set first(Object? _) => _throw();
+
+  /// Throws an [UnsupportedError].
+  // ignore: provide_deprecation_message
+  @deprecated
+  set last(Object? _) => _throw();
 }

pkgs/collection/test/extensions_test.dart

@@ -2225,7 +2225,7 @@ Iterable<T> iterable<T>(Iterable<T> values) sync* {
   yield* values;
 }
 
-Never unreachable([_, __, ___]) => fail('Unreachable');
+Never unreachable([dynamic _, dynamic __, dynamic ___]) => fail('Unreachable');
 
 String toString(Object? o) => '$o';