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In the same vein, I really like being able to use underscores in binary and hex literals to denote subfields in hardware registers.

0xDEADB_EEF

0b1_010_110111001001

etc.

Should take Verilog binary construction syntax, like { 12'd12, 16'hffee, 3'b101 } (or something similar that would fit with C's syntax).

Maybe not.

Why not? If you have to combine bit fields now, it's a mess of shifting and masking.