Fix verilog-auto-ignore-concat with parenthesis signals.

* verilog-mode.el (verilog-read-sub-decls-line):
Fix `verilog-auto-ignore-concat' with parenthesis signals.
Reported by Dmitri Sorkin.

Author: wsnyder

tests_ok/autoinput_concat_ignore.v

@@ -1,22 +1,22 @@
 module xyz (/*AUTOARG*/
+            // Outputs
+            signal_f, signal_c,
             // Inputs
-            signal_e3, signal_e, signal_b
+            signal_b
             );
 
    /*AUTOINPUT*/
    // Beginning of automatic inputs (from unused autoinst inputs)
-   input [2:0] signal_b;  // To u_abc of abc.v
-   input       signal_e;  // To u_def of def.v
-   input       signal_e3; // To u_def of def.v
+   input [2:0] signal_b; // To u_abc of abc.v
    // End of automatics
 
    /*AUTOOUTPUT*/
+   // Beginning of automatic outputs (from unused autoinst outputs)
+   output      signal_c; // From u_abc of abc.v
+   output      signal_f; // From u_def of def.v
+   // End of automatics
 
    /*AUTOWIRE*/
-   // Beginning of automatic wires (for undeclared instantiated-module outputs)
-   wire        signal_c;  // From u_abc of abc.v
-   wire        signal_f;  // From u_def of def.v
-   // End of automatics
 
    /* abc AUTO_TEMPLATE
     (

verilog-mode.el

@@ -9758,7 +9758,10 @@ Inserts the list of signals found, using submodi to look up each port."
 	;; We intentionally ignore (non-escaped) signals with .s in them
 	;; this prevents AUTOWIRE etc from noticing hierarchical sigs.
 	(when port
-          (cond ((looking-at "[^\n]*AUTONOHOOKUP"))
+          (cond ((and verilog-auto-ignore-concat
+                      (looking-at "[({]"))
+                 nil) ; {...} or (...) historically ignored with auto-ignore-concat
+                ((looking-at "[^\n]*AUTONOHOOKUP"))
                 ((looking-at "\\([a-zA-Z_][a-zA-Z_0-9]*\\)\\s-*)")
 		 (verilog-read-sub-decls-sig
                   submoddecls par-values comment port