/probe.toml:
[test]
key = 123
$ fq . probe.toml
{
  "test": {
    "key": 123
  }
}
# toml does not support null in arrays
# TODO: add uint64 norm test
$ fq -rRs 'fromjson[] | (walk(if type == "array" then map(select(. != null)) end) | try (to_toml | ., from_toml) catch .), "----"' variants.json
to_toml cannot be applied to: null
----
toml: top-level values must be Go maps or structs
----
toml: top-level values must be Go maps or structs
----
toml: top-level values must be Go maps or structs
----
toml: top-level values must be Go maps or structs
----
toml: top-level values must be Go maps or structs
----
toml: top-level values must be Go maps or structs
----
array = [true, false, 1.2, "string", [1.2, 3], {a = 1}]
"escape \\\"" = 456
false = false
number = 1.2
string = "string"
true = true
"white space" = 123

[object]
  a = 1

{
  "array": [
    true,
    false,
    1.2,
    "string",
    [
      1.2,
      3
    ],
    {
      "a": 1
    }
  ],
  "escape \\\"": 456,
  "false": false,
  "number": 1.2,
  "object": {
    "a": 1
  },
  "string": "string",
  "true": true,
  "white space": 123
}
----
toml: top-level values must be Go maps or structs
----

error at position 0x0: root object has no values
----
$ fq -n '"" | from_toml'
exitcode: 5
stderr:
error: error at position 0x0: root object has no values