port from perforce

intromat/Intromat/Model/Compiler/Error/CompilerException.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace Intromat.Model.Compiler.Error
+{
+    public class CompilerException : Exception
+    {
+        public CompilerException(string msg) : base(msg)
+        {
+        }
+
+        public CompilerException(string msg, Exception inner) : base(msg, inner)
+        {
+        }
+    }
+}

intromat/Intromat/Model/Compiler/Error/VariableOutOfScopeException.cs

@@ -0,0 +1,13 @@
+namespace Intromat.Model.Compiler.Error
+{
+    public class VariableOutOfScopeException : CompilerException
+    {
+        public VariableOutOfScopeException(string variableName)
+            : base($"The variable '{variableName}' was referenced outside its scope.")
+        {
+            VariableName = variableName;
+        }
+
+        public string VariableName { get; }
+    }
+}