support yield statements inside lambdas

src/codegen/codegen.cpp

@@ -73,13 +73,13 @@ SourceInfo::SourceInfo(BoxedModule* m, ScopingAnalysis* scoping, FutureFlags fut
 
     switch (ast->type) {
         case AST_TYPE::ClassDef:
-        case AST_TYPE::Lambda:
         case AST_TYPE::Module:
         case AST_TYPE::Expression:
         case AST_TYPE::Suite:
             is_generator = false;
             break;
         case AST_TYPE::FunctionDef:
+        case AST_TYPE::Lambda:
             is_generator = containsYield(ast);
             break;
         default:

src/core/cfg.cpp

@@ -1178,7 +1178,7 @@ private:
 
         push_back(makeExpr(new AST_LangPrimitive(AST_LangPrimitive::UNCACHE_EXC_INFO)));
 
-        if (root_type != AST_TYPE::FunctionDef)
+        if (root_type != AST_TYPE::FunctionDef && root_type != AST_TYPE::Lambda)
             raiseExcHelper(SyntaxError, "'yield' outside function");
 
         return makeLoad(node_name, node);

test/tests/generators.py

@@ -128,3 +128,9 @@ try:
     g.next()
 except Exception as e:
     print type(e), e # StopIteration
+
+
+x = lambda: (yield 1)
+print list(x())
+x = lambda: ((yield 1), (yield 2))
+print list(x())