Remove unnecessary parens (dart-lang/string_scanner#51)

pkgs/string_scanner/CHANGELOG.md

diff --git a/pkgs/string_scanner/CHANGELOG.md b/pkgs/string_scanner/CHANGELOG.md
index b5346b0..57b31ba 100644
--- a/pkgs/string_scanner/CHANGELOG.md
+++ b/pkgs/string_scanner/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 1.2.1-dev
+
 ## 1.2.0
 
 * Require Dart 2.18.0

pkgs/string_scanner/lib/src/eager_span_scanner.dart

diff --git a/pkgs/string_scanner/lib/src/eager_span_scanner.dart b/pkgs/string_scanner/lib/src/eager_span_scanner.dart
index db06127..1ccc746 100644
--- a/pkgs/string_scanner/lib/src/eager_span_scanner.dart
+++ b/pkgs/string_scanner/lib/src/eager_span_scanner.dart
@@ -97,7 +97,7 @@
   @override
   bool scan(Pattern pattern) {
     if (!super.scan(pattern)) return false;
-    final firstMatch = (lastMatch![0])!;
+    final firstMatch = lastMatch![0]!;
 
     final newlines = _newlinesIn(firstMatch);
     _line += newlines.length;

pkgs/string_scanner/lib/src/line_scanner.dart

diff --git a/pkgs/string_scanner/lib/src/line_scanner.dart b/pkgs/string_scanner/lib/src/line_scanner.dart
index 5bf701c..2903c40 100644
--- a/pkgs/string_scanner/lib/src/line_scanner.dart
+++ b/pkgs/string_scanner/lib/src/line_scanner.dart
@@ -106,9 +106,9 @@
     final newlines = _newlinesIn(lastMatch![0]!);
     _line += newlines.length;
     if (newlines.isEmpty) {
-      _column += (lastMatch![0])!.length;
+      _column += lastMatch![0]!.length;
     } else {
-      _column = (lastMatch![0])!.length - newlines.last.end;
+      _column = lastMatch![0]!.length - newlines.last.end;
     }
 
     return true;

pkgs/string_scanner/pubspec.yaml

diff --git a/pkgs/string_scanner/pubspec.yaml b/pkgs/string_scanner/pubspec.yaml
index 6f14e81..b297e50 100644
--- a/pkgs/string_scanner/pubspec.yaml
+++ b/pkgs/string_scanner/pubspec.yaml
@@ -1,5 +1,5 @@
 name: string_scanner
-version: 1.2.0
+version: 1.2.1-dev
 description: A class for parsing strings using a sequence of patterns.
 repository: https://github.com/dart-lang/string_scanner