operator-dot: added support to access dict value by exprssion; example: D.key, D."key", D.expr

t_dict_test.go

@@ -39,6 +39,9 @@ func TestDictParser(t *testing.T) {
 			//"b":2,
 			"c":3
 			}`, map[any]any{"a": 1, "c": 3}, nil},
+		/* 13 */ {`D={"a":1, "b":2}; D."a"`, int64(1), nil},
+		/* 14 */ {`D={"a":1, "b":2}; D.a`, int64(1), nil},
+		/* 15 */ {`D={1:"a", 2:"b", 3:"c"}; D.(1+2)`, "c", nil},
 	}
 
 	succeeded := 0