upgrade to latest iverilog

.github/workflows/main.yaml

@@ -41,7 +41,7 @@ jobs:
           - macOS-10.15
     needs: build
     env:
-      IVERILOG_REF: 066eb0aca76f5bde06c63d67e605c07ef9f8be23
+      IVERILOG_REF: 96a1cbf7b2866c41ba8fcdcc0f76f22590d08030
     steps:
       - uses: actions/checkout@v1
       - name: Install Dependencies (macOS)

test/basic/typeof_op.sv

@@ -43,12 +43,10 @@ module top;
         `TEST(4'b1011 + 5'b01110)
         `TEST(4'b1011 - 5'b01110)
         `TEST(4'b1011 ** 5'b01110)
+        `TEST(4'b1011 -> 5'b01110)
         `TEST(4'b1011 <-> 5'b01110)
         `TEST(4'b1011 ==? 5'b01110)
         `TEST(4'b1011 !=? 5'b01110)
 
-        // TODO: not yet supported by iverilog
-        // `TEST(4'b1011 -> 5'b01110)
-
     end
 endmodule