Units: Add unit tests for null tags #4157
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(This is related to #4151.)
Add unit tests in various languages (JSON, Tcl, Verilog/SystemVerilog) to test if null tags are properly implemented.
Note that Tcl doesn't support empty namespace names using
::
syntax sincefoo::::bar
is synonymous offoo::bar
, so we're not testing empty namespace names there, only empty proc names.Note that the current Tcl parser doesn't seem to support {braced} identifiers at all (including the empty identifier), so perhaps adding support for null tags in Tcl is trickier.
(Maybe I should remove Tcl entirely from the test since it currently doesn't seem to support empty identifiers due to this, and these tests are for testing empty identifiers in general and not a language in particular.)