Output: Avoid assertion failure on a FunctionDecl with no identifier

All C++98 function declarations have identifiers as names.  Some C++11
function declarations, such as user defined literal operators, do not
have identifiers.  While we may implement support for these in a future
non-gccxml output format, for now simply avoid an assertion failure by
outputting such declarations as Unimplemented nodes.

Issue: #76

1 files changed, 3 insertions, 0 deletions

diff --git a/test/input/CXXLiteral.cxx b/test/input/CXXLiteral.cxx
new file mode 100644
index 0000000..2d35460
--- /dev/null
+++ b/test/input/CXXLiteral.cxx
@@ -0,0 +1,3 @@
+namespace start {
+  unsigned long long operator "" _u(unsigned long long);
+}