Apply code fixes

Author: josefpihrt

src/CSharp/CSharp/CSharpTypeAnalysis.cs

@@ -263,7 +263,7 @@ public static bool IsTypeObvious(ExpressionSyntax expression, SemanticModel sema
                     {
                         var implicitArrayCreation = (ImplicitArrayCreationExpressionSyntax)expression;
 
-                        var expressions = implicitArrayCreation.Initializer?.Expressions ?? default;
+                        SeparatedSyntaxList<ExpressionSyntax> expressions = implicitArrayCreation.Initializer?.Expressions ?? default;
 
                         if (!expressions.Any())
                             return false;

src/CSharp/CSharp/Extensions/SyntaxExtensions.cs

@@ -1699,7 +1699,7 @@ internal static bool IsSingleLine<TNode>(
             if (span.IsEmpty)
                 return false;
 
-            SyntaxTree tree = list.First().SyntaxTree;
+            SyntaxTree tree = list[0].SyntaxTree;
 
             if (tree == null)
                 return false;
@@ -1718,7 +1718,7 @@ internal static bool IsMultiLine<TNode>(
             if (span.IsEmpty)
                 return false;
 
-            SyntaxTree tree = list.First().SyntaxTree;
+            SyntaxTree tree = list[0].SyntaxTree;
 
             if (tree == null)
                 return false;
@@ -1735,7 +1735,7 @@ internal static TextSpan GetSpan<TNode>(
                 return default;
 
             return TextSpan.FromBounds(
-                GetStartIndex(list.First(), includeExteriorTrivia, trim),
+                GetStartIndex(list[0], includeExteriorTrivia, trim),
                 GetEndIndex(list.Last(), includeExteriorTrivia, trim));
         }
 
@@ -2150,7 +2150,7 @@ internal static bool IsSingleLine<TNode>(
             if (span.IsEmpty)
                 return false;
 
-            SyntaxTree tree = list.First().SyntaxTree;
+            SyntaxTree tree = list[0].SyntaxTree;
 
             if (tree == null)
                 return false;
@@ -2169,7 +2169,7 @@ internal static bool IsMultiLine<TNode>(
             if (span.IsEmpty)
                 return false;
 
-            SyntaxTree tree = list.First().SyntaxTree;
+            SyntaxTree tree = list[0].SyntaxTree;
 
             if (tree == null)
                 return false;
@@ -2186,7 +2186,7 @@ internal static TextSpan GetSpan<TNode>(
                 return default;
 
             return TextSpan.FromBounds(
-                GetStartIndex(list.First(), includeExteriorTrivia, trim),
+                GetStartIndex(list[0], includeExteriorTrivia, trim),
                 GetEndIndex(list.Last(), includeExteriorTrivia, trim));
         }