Taking advantage of C# 7.3 language features

Author: mstefarov

fNbt/Tags/NbtCompound.cs

@@ -207,11 +207,10 @@ internal void RenameTag([NotNull] string oldName, [NotNull] string newName) {
             Debug.Assert(oldName != null);
             Debug.Assert(newName != null);
             Debug.Assert(newName != oldName);
-            NbtTag tag;
-            if (tags.TryGetValue(newName, out tag)) {
+            if (tags.TryGetValue(newName, out _)) {
                 throw new ArgumentException("Cannot rename: a tag with the name already exists in this compound.");
             }
-            if (!tags.TryGetValue(oldName, out tag)) {
+            if (!tags.TryGetValue(oldName, out NbtTag tag)) {
                 throw new ArgumentException("Cannot rename: no tag found to rename.");
             }
             tags.Remove(oldName);

fNbt/Tags/NbtTag.cs

@@ -42,8 +42,7 @@ public string Name {
                     return;
                 }
 
-                var parentAsCompound = Parent as NbtCompound;
-                if (parentAsCompound != null) {
+                if (Parent is NbtCompound parentAsCompound) {
                     if (value == null) {
                         throw new ArgumentNullException(nameof(value),
                                                         "Name of tags inside an NbtCompound may not be null.");
@@ -67,8 +66,7 @@ public string Path {
                 if (Parent == null) {
                     return Name ?? "";
                 }
-                var parentAsList = Parent as NbtList;
-                if (parentAsList != null) {
+                if (Parent is NbtList parentAsList) {
                     return parentAsList.Path + '[' + parentAsList.IndexOf(this) + ']';
                 } else {
                     return Parent.Path + '.' + Name;