Make bitfield unit allocation fallible

Instead of panicking when we see a bitfield that does not have a layout, return
an error up the stack. If we get an error when allocating bitfields into units,
then make the whole struct opaque.

Fixes #1140

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/headers/templatized-bitfield.hpp b/tests/headers/templatized-bitfield.hpp
new file mode 100644
index 00000000..ed4a1540
--- /dev/null
+++ b/tests/headers/templatized-bitfield.hpp
@@ -0,0 +1,7 @@
+/// We don't get a layout for this bitfield, since we don't know what `T` will
+/// be, so we cannot allocate bitfield units. The best thing we can do is make
+/// the struct opaque.
+template <class T>
+class TemplatizedBitfield {
+    T t : 6;
+};