calyx 0.7.1

Compiler Infrastructure for Hardware Accelerator Generation
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---STDERR---
Error: tests/errors/no-drive.futil
9 |    group no_drive {
  |    ^^^^^^^^^^^^^^^^ [Papercut] Required signal not driven inside the group. When writing to the port `r.in', the ports [r.write_en] must also be written to. The primitive type `std_reg' specifies this using a @write_together spec.