mettle
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Remove workaround for GCC bug 64194
Currently, we have to work around Bug 64194: <unresolved overloaded function type> for function template with auto return. Once GCC fixes it, we should remove the workaround.
This is fixed in GCC 11 and backported to GCC 9 and 10, so once we drop support for earlier versions, the workaround can be removed.