fix embrace operator printing; add test #1855
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Fixes #1834
as_label()used to error out if supplied an embraced symbol (e.g.,{{x}}) becausecall_print_fine_type()did not anticipate{{as an option.call_print_fine_type()now returns"delim"for calls to{{instead of null. The result is thatas_label()will now always yield{ ... }if it is supplied an embraced symbol, which is whatas_label()returns for all other calls to{. A test was added to ensure that this would be the result.