Add 3 source files containing syntax nodes

FinallyBlockSyntax.cs - for the IL finally block; TryBlockSyntax.cs - for the IL .try block, and TryFinallyBlockSyntax.cs - for IL .try { ... } finally { ... } block

ILSourceParser/Syntax/FinallyBlockSyntax.cs

@@ -0,0 +1,28 @@
+using ILSourceParser.Trivia;
+using System.Collections.Immutable;
+
+namespace ILSourceParser.Syntax;
+
+/// <summary>
+/// Represents an IL <c>finally</c> block.
+/// </summary>
+public sealed class FinallyBlockSyntax : SyntaxNode
+{
+    public override ImmutableArray<SyntaxTrivia> LeadingTrivia { get; init; }
+    public override ImmutableArray<SyntaxTrivia> TrailingTrivia { get; init; }
+
+    /// <summary>
+    /// Descendant nodes of the block.
+    /// </summary>
+    public IEnumerable<SyntaxNode> DescendantNodes { get; init; }
+
+    internal FinallyBlockSyntax(
+        ImmutableArray<SyntaxTrivia> leadingTrivia,
+        ImmutableArray<SyntaxTrivia> trailingTrivia,
+        IEnumerable<SyntaxNode> descendantNodes)
+    {
+        LeadingTrivia = leadingTrivia;
+        TrailingTrivia = trailingTrivia;
+        DescendantNodes = descendantNodes;
+    }
+}

ILSourceParser/Syntax/TryBlockSyntax.cs

@@ -0,0 +1,28 @@
+using ILSourceParser.Trivia;
+using System.Collections.Immutable;
+
+namespace ILSourceParser.Syntax;
+
+/// <summary>
+/// Represents an IL <c>.try</c> block.
+/// </summary>
+public sealed class TryBlockSyntax : SyntaxNode
+{
+    public override ImmutableArray<SyntaxTrivia> LeadingTrivia { get; init; }
+    public override ImmutableArray<SyntaxTrivia> TrailingTrivia { get; init; }
+
+    /// <summary>
+    /// Descendant nodes of the block.
+    /// </summary>
+    public IEnumerable<SyntaxNode> DescendantNodes { get; init; }
+
+    internal TryBlockSyntax(
+        ImmutableArray<SyntaxTrivia> leadingTrivia,
+        ImmutableArray<SyntaxTrivia> trailingTrivia,
+        IEnumerable<SyntaxNode> descendantNodes)
+    {
+        LeadingTrivia = leadingTrivia;
+        TrailingTrivia = trailingTrivia;
+        DescendantNodes = descendantNodes;
+    }
+}

ILSourceParser/Syntax/TryFinallyBlockSyntax.cs

@@ -0,0 +1,24 @@
+using ILSourceParser.Trivia;
+using System.Collections.Immutable;
+
+namespace ILSourceParser.Syntax;
+
+public sealed class TryFinallyBlockSyntax : SyntaxNode
+{
+    public override ImmutableArray<SyntaxTrivia> LeadingTrivia { get; init; }
+    public override ImmutableArray<SyntaxTrivia> TrailingTrivia { get; init; }
+    public TryBlockSyntax TryBlock { get; init; }
+    public FinallyBlockSyntax FinallyBlock { get; init; }
+
+    internal TryFinallyBlockSyntax(
+        ImmutableArray<SyntaxTrivia> leadingTrivia,
+        ImmutableArray<SyntaxTrivia> trailingTrivia,
+        TryBlockSyntax tryBlock,
+        FinallyBlockSyntax finallyBlock)
+    {
+        LeadingTrivia = leadingTrivia;
+        TrailingTrivia = trailingTrivia;
+        TryBlock = tryBlock;
+        FinallyBlock = finallyBlock;
+    }
+}