+class APipeExpr
+ super AExpr
+ var n_expr: AExpr is writable, noinit
+ var n_op: TPipe is writable, noinit
+ var n_expr2: AExpr is writable, noinit
+end
+class ACaretExpr
+ super AExpr
+ var n_expr: AExpr is writable, noinit
+ var n_op: TCaret is writable, noinit
+ var n_expr2: AExpr is writable, noinit
+end
+class AAmpExpr
+ super AExpr
+ var n_expr: AExpr is writable, noinit
+ var n_op: TAmp is writable, noinit
+ var n_expr2: AExpr is writable, noinit
+end