diff --git a/tests/various/sv_implicit_ports.sh b/tests/various/sv_implicit_ports.sh
new file mode 100755
index 0000000..13d39cf
--- /dev/null
+++ b/tests/various/sv_implicit_ports.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+trap 'echo "ERROR in sv_implicit_ports.sh" >&2; exit 1' ERR
+
+# Simple case
+../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:\$add" - <<EOT
+module add(input [7:0] a, input [7:0] b, output [7:0] q);
+	assign q = a + b;
+endmodule
+
+module top(input [7:0] a, output [7:0] q);
+	wire [7:0] b = 8'd42;
+	add add_i(.*);
+endmodule
+EOT
+
+# Generate block
+../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:\$add" - <<EOT
+module add(input [7:0] a, input [7:0] b, output [7:0] q);
+assign q = a + b;
+endmodule
+
+module top(input [7:0] a, output [7:0] q);
+	generate
+	if (1) begin:ablock
+		wire [7:0] b = 8'd42;
+		add add_i(.*);
+	end
+	endgenerate
+endmodule
+EOT
+
+# Missing wire
+((../../yosys -f "verilog -sv" -qp "hierarchy -top top" - || true) <<EOT
+module add(input [7:0] a, input [7:0] b, output [7:0] q);
+	assign q = a + b;
+endmodule
+
+module top(input [7:0] a, output [7:0] q);
+	add add_i(.*);
+endmodule
+EOT
+) 2>&1 | grep -F "ERROR: No matching wire for implicit port connection \`b' of cell top.add_i (add)." > /dev/null
+
+# Incorrectly sized wire
+((../../yosys -f "verilog -sv" -qp "hierarchy -top top" - || true) <<EOT
+module add(input [7:0] a, input [7:0] b, output [7:0] q);
+	assign q = a + b;
+endmodule
+
+module top(input [7:0] a, output [7:0] q);
+	wire [6:0] b = 6'd42;
+	add add_i(.*);
+endmodule
+EOT
+) 2>&1 | grep -F "ERROR: Width mismatch between wire (7 bits) and port (8 bits) for implicit port connection \`b' of cell top.add_i (add)." > /dev/null