NodeContext(clang::Stmt* s0, clang::Stmt* s1) {
   m_Stmts.push_back(s0);
   m_Stmts.push_back(s1);
 }
 void append(clang::Stmt* S) {
   m_Stmts.push_back(S);
 }
 NodeContext(clang::Stmt* s) { m_Stmts.push_back(s); }