/* if1.sv */
interface if1;

logic s1;

endinterface : if1

/* if2.sv */
interface if2;

if1 a;
logic s2;

endinterface : if2;

/* mod1.sv */
module mod1

(
  if2 foo
);

logic l1, l2;

always_comb @(*) begin
  l1 = foo.a.s1;
  l2 = foo.s2;
end

endmodule : mod1

/* top.sv */
module top;

if2 if2_0;

assign if2_0.a.s1 = 0;
assign if2_0.s2 = 1;

mod1 mod1_instance(
  .foo (if2_0)
);

endmodule : top;

%Error: mod1.sv:11: Can't find definition of 'foo' in dotted signal: foo.a.s1
%Error:      Known scopes under 's1': <no cells found>
%Error: Internal Error: mod1.sv:11: ../V3Const.cpp:1531: Not linked
%Error: Command Failed /Users/arjen/dev/verilator/bin/verilator_bin -cc --trace --compiler clang -sv +1800-2012ext+sv -y . top.sv