{
  "format": [
    {
      "expr": "format(null)",
      "result": { "kind": "String", "value": "" }
    },
    {
      "expr": "format(null, 'some arg')",
      "result": { "kind": "String", "value": "" }
    },
    {
      "expr": "format('')",
      "result": { "kind": "String", "value": "" }
    },
    {
      "expr": "format('', 'some arg')",
      "result": { "kind": "String", "value": "" }
    },
    {
      "expr": "format('123{0}456', 'abc')",
      "result": { "kind": "String", "value": "123abc456" }
    },
    {
      "expr": "format('123{0}456{0}789', 'abc')",
      "result": { "kind": "String", "value": "123abc456abc789" }
    },
    {
      "expr": "format('123{0}456{1}789', 'abc', 'def')",
      "result": { "kind": "String", "value": "123abc456def789" }
    },
    {
      "expr": "format('{0}123', 'abc')",
      "result": { "kind": "String", "value": "abc123" }
    },
    {
      "expr": "format('123{0}', 'abc')",
      "result": { "kind": "String", "value": "123abc" }
    },
    {
      "expr": "format('123{0}{1}456', 'abc', 'def')",
      "result": { "kind": "String", "value": "123abcdef456" }
    },
    {
      "expr": "format('{{0}}', 'abc')",
      "result": { "kind": "String", "value": "{0}" }
    },
    {
      "expr": "format('{{{{0}}}}', 'abc')",
      "result": { "kind": "String", "value": "{{0}}" }
    },
    {
      "expr": "format('}}', 'abc')",
      "result": { "kind": "String", "value": "}" }
    },
    {
      "expr": "format('{{', 'abc')",
      "result": { "kind": "String", "value": "{" }
    },
    {
      "expr": "format('}}{{', 'abc')",
      "result": { "kind": "String", "value": "}{" }
    },
    {
      "expr": "format('}}{{}}', 'abc')",
      "result": { "kind": "String", "value": "}{}" }
    },
    {
      "expr": "format('{0}', Infinity)",
      "result": { "kind": "String", "value": "Infinity" }
    },
    {
      "expr": "format('{0}', -Infinity)",
      "result": { "kind": "String", "value": "-Infinity" }
    },
    {
      "expr": "format('{0}', NaN)",
      "result": { "kind": "String", "value": "NaN" }
    },
    {
      "expr": "format('{0}', -0)",
      "result": { "kind": "String", "value": "0" }
    },
    {
      "expr": "format('{0}', -0.0)",
      "result": { "kind": "String", "value": "0" }
    },
    {
      "expr": "format('{0')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {0"
      }
    },
    {
      "expr": "format('{0', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {0"
      }
    },
    {
      "expr": "format('{0}}', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {0}}"
      }
    },
    {
      "expr": "format('{0}}}}', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {0}}}}"
      }
    },
    {
      "expr": "format('0}')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: 0}"
      }
    },
    {
      "expr": "format('0}', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: 0}"
      }
    },
    {
      "expr": "format('{{0}')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {{0}"
      }
    },
    {
      "expr": "format('{{0}', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {{0}"
      }
    },
    {
      "expr": "format('{{{{0}')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {{{{0}"
      }
    },
    {
      "expr": "format('{{{{0}', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {{{{0}"
      }
    },
    {
      "expr": "format('}0{')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: }0{"
      }
    },
    {
      "expr": "format('}0{', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: }0{"
      }
    },
    {
      "expr": "format('}{0}')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: }{0}"
      }
    },
    {
      "expr": "format('}{0}', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: }{0}"
      }
    },
    {
      "expr": "format('{0}{', '')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string is invalid: {0}{"
      }
    },
    {
      "expr": "format('{0}')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string references more arguments than were supplied: {0}"
      }
    },
    {
      "expr": "format('{0}{1}', 'abc')",
      "err": {
        "kind": "evaluation",
        "value": "The following format string references more arguments than were supplied: {0}{1}"
      }
    }
  ]
}