initial support for types in struct patterns

test/basic/pattern.sv

@@ -0,0 +1,40 @@
+module test;
+    typedef struct packed {
+        int w, x;
+        byte y;
+        logic z;
+    } struct_a;
+    struct_a a;
+    initial begin
+        $monitor("%2d: %b %b %b %b %b", $time, a, a.w, a.x, a.y, a.z);
+
+        #1 a.w = 0;
+        #1 a.x = 0;
+        #1 a.y = 0;
+        #1 a.z = 0;
+
+        #1 a = '{default: 1};
+        #1 a = '{default: 2};
+        #1 a = '{default: 3};
+        #1 a = '{default: 0};
+        #1 a = '{default: -1};
+        #1 a = '{default: -2};
+
+        #1 a = '{int: 0, default: 1};
+        #1 a = '{byte: 0, default: 1};
+        #1 a = '{logic: 0, default: 1};
+        #1 a = '{logic: 1, int: 2, byte: 3};
+        #1 a = '{logic: 1, int: 2, byte: 3, default: -1};
+        #1 a = '{int: 3, byte: 2, default: 0};
+
+        #1 a = '{w: 8, int: 0, default: 1};
+        #1 a = '{w: 8, byte: 0, default: 1};
+        #1 a = '{w: 8, logic: 0, default: 1};
+        #1 a = '{w: 8, logic: 1, int: 2, byte: 3};
+        #1 a = '{w: 8, logic: 1, int: 2, byte: 3, default: -1};
+        #1 a = '{w: 8, int: 3, byte: 2, default: 0};
+
+    end
+endmodule
+
+module top; endmodule