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-rw-r--r--build2/file.cxx3
1 files changed, 3 insertions, 0 deletions
diff --git a/build2/file.cxx b/build2/file.cxx
index b735cab..e494f5a 100644
--- a/build2/file.cxx
+++ b/build2/file.cxx
@@ -594,6 +594,9 @@ namespace build2
string n;
if (i->pair)
{
+ if (i->pair != '@')
+ fail << "unexpected pair style in variable subprojects";
+
try
{
n = convert<string> (move (*i));