[regression] defparam failing with default_nettype none

[daveshah1]

Testcase:

`default_nettype none

module A;
parameter P = 0;
endmodule

module top;
A inst_i();
defparam inst_i.P = 1;
endmodule

Regression bisected to commit 23148ff

[adumont]

Hi. My project passed building (synthesizing) last week just fine (https://travis-ci.org/adumont/hrm-cpu/builds/494525894), it was using yosys at commit e45f62b.

Today, at Yosys commit c521f46, my same code is failing to synthesize with error:

hrmcpu.v:146: ERROR: Identifier \program0.PROGRAM' is implicitly declared and default_nettype is set to none.

Offending line in my code according to yosys is: https://github.com/adumont/hrm-cpu/blob/master/verilog/hrmcpu.v#L146:

defparam program0.PROGRAM = PROGRAM;

Changing to PROG #(.PROGRAM(PROGRAM)) program0 (...) seems to work as a workaround.

--

confirmed, synthesis goes well with yosys @ 974927a (previous commit), then fails with yosys @ 23148ff.

[cliffordwolf]

Ooops. Fixed in 1816fe0.

[adumont]

Fix confirmed, working now

https://travis-ci.org/adumont/hrm-cpu/builds/497851251

Thanks a lot