Fix error message

src/V3LinkParse.cpp

@@ -578,7 +578,7 @@ class LinkParseVisitor final : public VNVisitor {
         } else if (VN_IS(bracketp, SelLoopVars)) {
             // Ok
         } else {
-            nodep->v3error("Syntax error; foreach missing bracketed loop variable"
+            nodep->v3error("Foreach missing bracketed loop variable is no-operation"
                            " (IEEE 1800-2023 12.7.3)");
             VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
             return;

src/verilog.y

@@ -6112,6 +6112,7 @@ idArrayedForeach<nodeExprp>:    // IEEE: id + select (under foreach expression)
                 id
                         { $$ = new AstParseRef{$<fl>1, VParseRefExp::PX_TEXT, *$1, nullptr, nullptr}; }
         //                      // IEEE: id + part_select_range/constant_part_select_range
+        |       idArrayed '[' ']'                               { $$ = $1; }  // Or AstArraySel, don't know yet.
         |       idArrayed '[' expr ']'                          { $$ = new AstSelBit{$2, $1, $3}; }  // Or AstArraySel, don't know yet.
         |       idArrayed '[' constExpr ':' constExpr ']'       { $$ = new AstSelExtract{$2, $1, $3, $5}; }
         //                      // IEEE: id + indexed_range/constant_indexed_range

test_regress/t/t_foreach_bad.out

@@ -1,8 +1,11 @@
-%Error: t/t_foreach_bad.v:14:7: Syntax error; foreach missing bracketed loop variable (IEEE 1800-2023 12.7.3)
+%Error: t/t_foreach_bad.v:14:7: Foreach missing bracketed loop variable is no-operation (IEEE 1800-2023 12.7.3)
    14 |       foreach (array);   
       |       ^~~~~~~
         ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
-%Error: t/t_foreach_bad.v:18:23: 'foreach' loop variable expects simple variable name
+%Error: t/t_foreach_bad.v:16:7: Foreach missing bracketed loop variable is no-operation (IEEE 1800-2023 12.7.3)
-   18 |       foreach (array[a.b]);   
+   16 |       foreach (array[]);   
+      |       ^~~~~~~
+%Error: t/t_foreach_bad.v:20:23: 'foreach' loop variable expects simple variable name
+   20 |       foreach (array[a.b]);   
       |                       ^
 %Error: Exiting due to

test_regress/t/t_foreach_bad.v

@@ -13,6 +13,8 @@ module t (/*AUTOARG*/);
    initial begin
       foreach (array);  // no index
 
+      foreach (array[]);  // no index
+
       foreach (array.array[a]); // not supported
 
       foreach (array[a.b]);  // no index