overlay::[
  {
    name:"OVERLAY 'hello' PLACING '' FROM 1",
    statement:"OVERLAY('hello' PLACING '' FROM 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"hello"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING '' FROM 2 FOR 3",
    statement:"OVERLAY('hello' PLACING '' FROM 2 FOR 3)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"ho"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING '' FROM 2 FOR 4",
    statement:"OVERLAY('hello' PLACING '' FROM 2 FOR 4)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"h"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 1",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"XXllo"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 1 FOR 3",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 1 FOR 3)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"XXlo"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 1 FOR 1",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 1 FOR 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"XXello"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 1 FOR 100",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 1 FOR 100)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"XX"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 1 FOR 0",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 1 FOR 0)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"XXhello"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 7",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 7)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"helloXX"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 100 FOR 100",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 100 FOR 100)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"helloXX"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 2 FOR 1",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 2 FOR 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"hXXllo"
    }
  },
  {
    name:"OVERLAY 'hello' PLACING 'XX' FROM 2 FOR 3",
    statement:"OVERLAY('hello' PLACING 'XX' FROM 2 FOR 3)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:"hXXo"
    }
  },
  {
    name:"OVERLAY MISSING",
    statement:"OVERLAY(MISSING PLACING 'XX' FROM 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:$missing::null
    }
  },
  {
    name:"OVERLAY PLACING MISSING",
    statement:"OVERLAY('foo' PLACING MISSING FROM 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:$missing::null
    }
  },
  {
    name:"OVERLAY FROM MISSING",
    statement:"OVERLAY('foo' PLACING 'bar' FROM MISSING)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:$missing::null
    }
  },
  {
    name:"OVERLAY FOR MISSING",
    statement:"OVERLAY('foo' PLACING 'bar' FROM 1 FOR MISSING)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:$missing::null
    }
  },
  {
    name:"OVERLAY NULL",
    statement:"OVERLAY(NULL PLACING 'XX' FROM 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:null
    }
  },
  {
    name:"OVERLAY PLACING NULL",
    statement:"OVERLAY('foo' PLACING NULL FROM 1)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:null
    }
  },
  {
    name:"OVERLAY FROM NULL",
    statement:"OVERLAY('foo' PLACING 'bar' FROM NULL)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:null
    }
  },
  {
    name:"OVERLAY FOR NULL",
    statement:"OVERLAY('foo' PLACING 'bar' FROM 1 FOR NULL)",
    assert:{
      result:EvaluationSuccess,
      evalMode:[
        EvalModeCoerce,
        EvalModeError
      ],
      output:null
    }
  },
  {
    name:"OVERLAY mismatched type",
    statement:"OVERLAY(1 PLACING 'XX' FROM 1)",
    assert: [
      {
        evalMode: EvalModeError,
        result:EvaluationFail,
      },
      {
        result:EvaluationSuccess,
        evalMode: EvalModeCoerce,
        output:$missing::null
      }
    ]
  },
  {
    name:"OVERLAY PLACING mismatched type",
    statement:"OVERLAY('foo' PLACING 1 FROM 1)",
    assert: [
      {
        evalMode: EvalModeError,
        result:EvaluationFail,
      },
      {
        result:EvaluationSuccess,
        evalMode: EvalModeCoerce,
        output:$missing::null
      }
    ]
  },
  {
    name:"OVERLAY FROM mismatched type",
    statement:"OVERLAY('foo' PLACING 'bar' FROM 'string')",
    assert: [
      {
        evalMode: EvalModeError,
        result:EvaluationFail,
      },
      {
        result:EvaluationSuccess,
        evalMode: EvalModeCoerce,
        output:$missing::null
      }
    ]
  },
  {
    name:"OVERLAY FOR mismatched type",
    statement:"OVERLAY('foo' PLACING 'bar' FROM 1 FOR 'string')",
    assert: [
      {
        evalMode: EvalModeError,
        result:EvaluationFail,
      },
      {
        result:EvaluationSuccess,
        evalMode: EvalModeCoerce,
        output:$missing::null
      }
    ]
  }
]