C#: Modify database schema to allow lambda expression to be attributable and extract the lambda expression attributes.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Lambda.cs

@@ -28,6 +28,7 @@ private Lambda(ExpressionNodeInfo info, CSharpSyntaxNode body, IEnumerable<Param
             if (Context.GetModel(info.Node).GetSymbolInfo(info.Node).Symbol is IMethodSymbol symbol)
             {
                 Modifier.ExtractModifiers(Context, info.Context.TrapWriter.Writer, this, symbol);
+                Attribute.ExtractAttributes(Context, symbol, this);
             }
             else
             {

csharp/ql/lib/semmle/code/csharp/Attribute.qll

@@ -10,8 +10,8 @@ private import TypeRef
  * An element that can have attributes. Either an assembly (`Assembly`), a field (`Field`),
  * a parameter (`Parameter`), an operator (`Operator`), a method (`Method`), a constructor (`Constructor`),
  * a destructor (`Destructor`), a callable accessor (`CallableAccessor`), a value or reference type
- * (`ValueOrRefType`), a declaration with accessors (`DeclarationWithAccessors`), or a local function
- * (`LocalFunction`).
+ * (`ValueOrRefType`), a declaration with accessors (`DeclarationWithAccessors`), a local function
+ * (`LocalFunction`) or a lambda expression (`LambdaExp`).
  */
 class Attributable extends @attributable {
   /** Gets an attribute attached to this element, if any. */

csharp/ql/lib/semmlecode.csharp.dbscheme

@@ -191,7 +191,7 @@ sourceLocationPrefix(
 
 @attributable = @assembly | @field | @parameter | @operator | @method | @constructor
               | @destructor | @callable_accessor | @value_or_ref_type | @declaration_with_accessors
-              | @local_function;
+              | @local_function | @lambda_expr;
 
 /** LOCATIONS, ASEMMBLIES, MODULES, FILES and FOLDERS **/