// RUN: mlir-opt %s --split-input-file --verify-diagnostics \
// RUN:             --transform-interpreter

func.func private @bar()

func.func @foo() {
  %c0 = arith.constant 0 : index
  %c1 = arith.constant 1 : index
  %c10 = arith.constant 10 : index
  // expected-note @below {{ancestor payload op}}
  scf.for %i = %c0 to %c1 step %c10 {
    // expected-note @below {{descendant payload op}}
    scf.for %j = %c0 to %c1 step %c10 {
      func.call @bar() : () -> ()
    }
  }
  return
}

module attributes {transform.with_named_sequence} {
  transform.named_sequence @__transform_main(%arg0: !transform.any_op) {
    %0 = transform.structured.match ops{["scf.for"]} in %arg0 : (!transform.any_op) -> !transform.op<"scf.for">
    %1 = transform.test_reverse_payload_ops %0 : (!transform.op<"scf.for">) -> !transform.op<"scf.for">
    // expected-error @below {{transform operation consumes a handle pointing to an ancestor payload operation before its descendant}}
    // expected-note @below {{the ancestor is likely erased or rewritten before the descendant is accessed, leading to undefined behavior}}
    transform.test_consume_operand_each %1 : !transform.op<"scf.for">
    transform.yield
  }
}

// -----

func.func private @bar()

func.func @foo() {
  %c0 = arith.constant 0 : index
  %c1 = arith.constant 1 : index
  %c10 = arith.constant 10 : index
  scf.for %i = %c0 to %c1 step %c10 {
    scf.for %j = %c0 to %c1 step %c10 {
      func.call @bar() : () -> ()
    }
  }
  return
}

// No error here, processing ancestors before descendants.
module attributes {transform.with_named_sequence} {
  transform.named_sequence @__transform_main(%arg0: !transform.any_op) {
    %0 = transform.structured.match ops{["scf.for"]} in %arg0 : (!transform.any_op) -> !transform.op<"scf.for">
    transform.test_consume_operand_each %0 : !transform.op<"scf.for">
    transform.yield
  }
}