multipack conversion visits exprs within types

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Bug Fixes
 
+* Fixed crash when converting multi-dimensional arrays or arrays of structs or
+  unions used in certain expressions involving unbased unsized literals
 * Fixed module-level localparams being needlessly inlined when forming longest
   static prefixes, which could cause deep recursion and run out of memory on
   some designs

src/Convert/MultiplePacked.hs

@@ -153,7 +153,14 @@ traverseLHSM = traverseNestedLHSsM traverseLHSSingleM
             return lhs'
 
 convertExprM :: Expr -> Scoper TypeInfo Expr
-convertExprM = embedScopes convertExpr
+convertExprM =
+    traverseExprTypesM convertTypeM >=>
+    embedScopes convertExpr
+
+convertTypeM :: Type -> Scoper TypeInfo Type
+convertTypeM =
+    traverseNestedTypesM $ traverseTypeExprsM $
+    traverseNestedExprsM convertExprM
 
 convertExpr :: Scopes TypeInfo -> Expr -> Expr
 convertExpr scopes =

test/core/multipack_delayed.sv

+module mod(inp, out);
+    parameter COUNT = 4;
+    typedef struct packed {
+        logic a, b, c;
+    } struct_t;
+    typedef union packed {
+        logic [2:0] raw;
+        struct_t fields;
+    } union_t;
+    input union_t [COUNT - 1:0] inp;
+    output logic [COUNT - 1:0] out;
+    for (genvar i = 0; i < COUNT; i += 1)
+        always_comb
+            if ((inp[i].raw & 3'b011) != '0)
+                out[i] = inp[i].fields.a ^ inp[i].fields.b;
+endmodule

test/core/multipack_delayed.v

+module mod(inp, out);
+    parameter COUNT = 1;
+    input wire [COUNT * 3 - 1:0] inp;
+    output reg [COUNT - 1:0] out;
+    genvar i;
+    generate
+        for (i = 0; i < COUNT; i = i + 1)
+            always @*
+                if (inp[i * 3] | inp[i * 3 + 1])
+                    out[i] = inp[i * 3 + 2] ^ inp[i * 3 + 1];
+    endgenerate
+endmodule

test/core/multipack_delayed_tb.v

+module top;
+    localparam COUNT = 4;
+    reg [COUNT * 3 - 1:0] inp;
+    wire [COUNT - 1:0] out;
+    mod #(COUNT) m(inp, out);
+    initial begin : blk
+        integer i;
+        $monitor("%2d %b %b", $time, inp, out);
+        for (i = 0; i < 2 ** (COUNT * 3); i = i + 1)
+            #1 inp = i;
+    end
+endmodule