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-rw-r--r--libbuild2/token.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/libbuild2/token.cxx b/libbuild2/token.cxx
index 0f9a189..4975a02 100644
--- a/libbuild2/token.cxx
+++ b/libbuild2/token.cxx
@@ -41,6 +41,7 @@ namespace build2
case token_type::assign: os << q << '=' << q; break;
case token_type::prepend: os << q << "=+" << q; break;
case token_type::append: os << q << "+=" << q; break;
+ case token_type::default_assign: os << q << "?=" << q; break;
case token_type::equal: os << q << "==" << q; break;
case token_type::not_equal: os << q << "!=" << q; break;